Which fire block foam prints a complete surface-burning result?

Seven of the listed cans do, on six sheets. Kraken Bond Extreme Fire Block prints UL 723 flame spread 10 and smoke developed 15 in a dated sheet that names both of its cans. Sprayman Fire Block and Pro Fire Block share one sheet that prints the same pair, 10 and 15, with no date or revision; the same sheet also prints DIN 4102-1 class B2, which is why the brand store says Class A and the Amazon title says B2 for one can. Stanley F952 prints the same pair, 10 and 15, on a dated sheet. TYTAN Fire Block 113 and Fire Block Extreme print flame spread 15 and smoke developed 10 in dated sheets for their 24 oz gun cans, and a third dated sheet prints the same pair for the Extreme 12 oz straw can. Great Stuff PRO names three methods with no figures. None of the listed cans prints the tested thickness. A surface-burning pair is not the fireblocking test this page is marked on, and only the TYTAN foams carry that mark: ICC-ES ESR-3302 evaluates them for keeping wood fireblocking intact where it is penetrated, within Type V-B and non-rated residential construction.

What does DIN 4102-1 B2 or B3 mean on a US can?

It is a German reaction-to-fire class from a different test system. B3 is the lowest class and B2 sits above it. Neither is a US surface-burning result and neither maps onto Class A, B or C, so a can that publishes only a DIN class has not told you how it performs under ASTM E84. A product can hold results under both systems; they answer different questions.

Why are Class A and B2 both claimed for the same Sprayman can?

The brand store says Class A and the Amazon title says B2 for the 20 oz Pro Fire Block can. Those are results from two different test systems, ASTM E84 or UL 723 in the US and DIN 4102-1 in Germany, and one product can hold both. Sprayman's own sheet prints both on consecutive lines, UL 723 flame spread 10 and smoke developed 15, then DIN 4102-1 B2, so each channel is quoting half of the same document. The problem is not that they conflict; it is that the sheet carries no date, no tested thickness and no report number, so a reader cannot pin either result to a version or a test set-up.

Is orange foam required by code?

No. Orange is what the trade uses so an inspector can recognize a can sold as fireblocking foam at a glance. The color identifies the product; it is not a function, a test result or an approval. No code makes fire block foam orange, and no orange foam is fire block because of its color. The document decides.

Can I use fire block foam around electrical wires, outlet boxes and low-voltage cable?

Most of the makers list electrical work as a use, but none of their documents covers low-voltage cable, cable jackets or foam inside a box. Seven of the nine fire block data sheets we read name it: Stanley’s F952 sheet says "Ideal for penetrations (HVAC, electrical and plumbing), insulating electrical outlets and water pipes," the Kraken Bond, Stanley F952P, Sprayman and both Akfix sheets list insulating electrical outlets, and TYTAN’s Fire Block 113 sheet lists "Sealing around electrical boxes and wiring penetrations." The two TYTAN Fire Block Extreme sheets name no electrical use. Whether a particular box or cable run may be foamed is an electrical code question for the local code official.

Will an inspector accept fire block foam as fireblocking?

That is the local code official’s decision, and ICC-ES listing ESL-1058 says so in its own words: "Approval of the product’s use is the sole responsibility of the local code official." That listing names Kraken Bond Extreme Fire Block, Stanley’s fire block foams and Akfix 840 for surface burning at a nominal half-inch bead, and adds that "The listing addresses only conformance with the standards and code sections noted above." The report written for the fireblocking use itself is TYTAN’s ESR-3302, which covers Fire Block, Fire Block 113 and Fire Block Extreme "for maintaining the integrity of penetrations of wood fireblocking," requires the packaging to carry "the evaluation report number (ESR-3302)" and says the maker’s installation instructions "must be available at the jobsite at all times during installation." The same report limits the foam to Type V-B construction under the IBC and non-rated construction under the IRC, and says it "is not intended for use as an alternative to wood fireblocking prescribed by the applicable code."

Which holes actually need fire block foam?

The building code decides which openings need fireblocking and the local code official applies it; the documents only say where each foam is meant to go. TYTAN’s evaluation report ESR-3302 covers the "annular space created by the penetration of wood fireblocking by pipes and conduits," says the foam must "completely fill the annular space for the full depth of the plate that has been penetrated" and allows beads of "maximum 2-inch-wide-by-2-inch-thick." Stanley’s F952 sheet lists "Partitions and stud walls, top and bottom stair stringers" and says the foam "SEALS SERVICE PENETRATIONS BETWEEN FLOORS," and TYTAN’s Fire Block Extreme 12 oz sheet lists "Sealing air leaks between floors and walls as required by building code." No sheet says which openings in a particular house must be fireblocked.

Can I use fire block foam as ordinary gap filler or insulation, for example around a window?

Most of the makers say yes: seven of the nine fire block data sheets we read list door and window frames as a use, in words such as Kraken Bond’s "Fixing and insulating door and window frames," and TYTAN’s Fire Block Extreme 24 oz sheet says the foam "is safe to be used around windows and doors." Stanley’s F952 sheet prints an R-value of "~4.1 per in." and the three TYTAN sheets print "R value 4 - 5," none of them with a test method beside the figure. All three TYTAN sheets also say "DOOR AND WINDOWS FITTING WITHOUT USING MECHANICAL COUPLING IS FORBIDDEN," so on those cans the foam seals around a frame that is fastened another way. TYTAN Fire Block 113 and the Fire Block Extreme 12 oz straw can name no window use.

How much does fire block foam expand?

Of the nine fire block data sheets we read, only TYTAN’s three print a figure: post-expansion of "120 - 150" percent for Fire Block 113, "80 - 110" for the Fire Block Extreme 24 oz gun can and "240 - 270" for the Fire Block Extreme 12 oz straw can, all to EN 17333-2:2020. Both Extreme sheets still describe "minimal post-expansion," the straw sheet beside its 240 - 270 figure. Kraken Bond, Stanley F952, Sprayman and Akfix 840 say only that the foam has a high expansion rate, and the Stanley F952P and Akfix 840P gun sheets say nothing about expansion. For open woodwork the TYTAN sheets add that "gaps >1.18 in (3 cm) are not recommended" and "Gaps >1.97 in (5cm) are unacceptable," although the Extreme sheets also call the foam "capable of filling gaps up to three inches."

Can I use fire block foam around PVC, CPVC or ABS pipes?

The sheets speak only to adhesion, not to chemical compatibility with a pipe, and only TYTAN names pipe plastics at all. TYTAN’s Fire Block Extreme 12 oz straw sheet lists "glass, vinyl, PVC, CPVC, plastics and more" among the materials the foam adheres to, its 24 oz sheet and the Fire Block 113 sheet name PVC without CPVC, and all three say "The foam displays lack of adhesion to polyethylene, polypropylene, polyamide, silicone and Teflon." No fire block sheet we read mentions ABS. The Kraken Bond, Stanley, Sprayman and Akfix sheets list "water pipes" as a use without naming a pipe material, and TYTAN’s ESR-3302 covers penetrations "by pipes and conduits" without naming one either.

Foam sealants by job · Intake screened September 7, 2026 · Listings read October 29, 2026

Best Fire Block Foam

Category evidence order · #1

TYTAN Professional Fire Block Extreme

3 of 4 confirmed$11.851 x 12 oz

On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.

Check price on Amazon Why it’s our pick

As an Amazon Associate I earn from qualifying purchases.

Fire block foam is a gap filler with a surface-burning claim on top. The color is a trade convention, not a code requirement and not a test result, so this page ignores the orange and reads the claim: which standard is named, whether both indices are printed, whether the tested thickness and the report exist. Most cans here fail that reading; the two TYTAN fire block foams carry a report number for the fireblocking claim itself.

Straight to the cans

The three this page puts first

Ordered by the evidence each can publishes, not by price. Every product, the full table and the records are below.

TYTAN Professional Fire Block Extreme

On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.

3 of 4 confirmed

$11.851 x 12 oz

Check price
Stanley F952 Fire Block

Dated sheet with UL 723 flame spread 10 and smoke developed 15, DIN 4102-1 B2 and a 10.6 gal yield.

2 of 4 confirmed

$13.991 x 12 oz

Check price
Kraken Bond Extreme Fire Block

Dated sheet with both UL 723 indices, flame spread 10 and smoke 15, and a bead yield for each can size it sells. That is a surface-burning result, not a fireblocking test.

2 of 4 confirmed

$21.991 x 24 oz

Check price

As an Amazon Associate I earn from qualifying purchases.

Fire block is not firestop, and a color is not a rating.

Fireblocking, in the residential code, resists the movement of flame and hot gases through concealed spaces in wood-frame construction. It is not a rated firestop system, and no foam on this page is listed for one. Draftstopping is a third term, for the material that subdivides large concealed spaces such as floor-ceiling assemblies and attics; a maker that calls a can a draft stop is naming a use, not a test. A UL 723 or ASTM E84 result describes how the foam surface burns in a tunnel test at a stated thickness; without both indices and the thickness, the number is not a classification. Where a code official is involved, ask for the report, not the can.

How this page is ordered

Four things we could confirm, and nothing we could not

Brand data sheetA technical data sheet published by the maker for this product. A safety data sheet or a web page is recorded but does not earn the mark, and where a sheet carries no date or revision the record says so.
Claim checkableFor a fire block foam the mark needs a fireblocking test with a number that can be looked up: a through-penetration or room-corner method such as a modified ASTM E814 or UL 1715, with a listing, file or report number. A surface-burning class does not earn it.
Brand-channel sellerThe Amazon seller of record is the brand or a storefront that carries only that brand in our intake. A multi-brand reseller or an unbranded trading company does not earn it.
100 or more ratingsOn the listing we link. A feedback base, not a verdict; how we read reviews is a separate guide.

Why that is the test. The reason is that a surface-burning test does not answer the question this claim makes. ASTM E84 and UL 723 measure how flame and smoke travel across a surface in a tunnel; they say nothing about whether foam in a hole will hold back fire and smoke between two spaces. So one index without the other, a class letter with no standard, and a German B2 or B3 class all fall short, and so does a complete E84 result on its own.

Products are ordered by how many of four things we could confirm, then by the size of the buyer-feedback base: a dated technical data sheet from the brand, a category claim you can check against a figure in a dated document, a marketplace seller that is the brand or its single-brand distributor, and at least 100 ratings on the listing we link. This is not a performance score. Nothing on this page was applied or tested by us.

At a glance

10 fire block products, in evidence order

The number in the first column is a position, not a score: products with more of the four things confirmed come first, and ties are broken by how many people have rated the product. Under each heading is how many products on this page cleared that test. A circle means we looked and it was not there. Prices are the October 29, 2026 snapshot for the cheapest bare-can listing we hold; ratings were read October 29, 2026. Prices are snapshots, each dated where it appears, not live figures, so check the seller before you pay. Tap a name for the full record.

#	Product	Format	Ratings1 of 10 over 100	Cheapest packwe could verify
Straw cans, nothing else to buy
1	TYTAN Professional Fire Block Extreme TYTAN Professional On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.	Straw, 12 oz	77	$11.851 x 12 oz
2	Stanley F952 Fire Block Stanley Dated sheet with UL 723 flame spread 10 and smoke developed 15, DIN 4102-1 B2 and a 10.6 gal yield.	Straw, 12 oz and 24 oz	92	$13.991 x 12 oz
3	Kraken Bond Extreme Fire Block Kraken Bond · also gaps and cracks Dated sheet with both UL 723 indices, flame spread 10 and smoke 15, and a bead yield for each can size it sells. That is a surface-burning result, not a fireblocking test.	Straw, 12 oz and 24 oz	68	$21.991 x 24 oz
4	Sprayman Fire Block Foam Sealant Sprayman The sheet prints UL 723 flame spread 10 and smoke developed 15, undated and with no tested thickness; the store still says "fireproof."	Straw, 12 oz	37	$14.991 x 12 oz
5	Akfix 840 Fire Block Akfix 2017 Akfix sheets give DIN 4102-1 B2 and "UL listed" for a 900 g pack, not the US cans; the straw can’s store page is empty.	Straw, 12 oz	9	$14.991 x 12 oz
Gun cans, a foam gun is needed
1	TYTAN Professional Fire Block Extreme TYTAN Professional On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.	gun, 24 oz	77	$11.851 x 12 oz
2	TYTAN Professional Fire Block 113 TYTAN Professional Contractor case of twelve 24 oz gun cans, rated to 113 F, on a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.	Gun, 24 oz	22	$107.0012 x 24 oz
3	Sprayman Pro Fire Block Foam Sprayman Class A on the store, B2 on Amazon, and one undated sheet that prints both.	Gun, 20 oz	65	$25.992 x 20 oz
4	Stanley F952P Fire Block Pro Stanley Gun version whose sheet drops the UL line and says "moderate fire safety."	Gun, 24 oz	0	$25.992 x 24 oz
5	Great Stuff PRO Gaps & Cracks Great Stuff PRO · also gaps and cracks Orange 3 in gun foam that DuPont calls fireblock formulated; three test methods named, no figures, sold through a reseller.	Gun, 24 oz and 30 oz	528	$157.9512 x 24 oz
6	Enerfoam 30 oz Fireblock Rated Sealant Enerfoam · also gaps and cracks 30 oz gun foam sold through a reseller; DuPont makes it and calls it a fireblock on its own page, with no standard and no indices anywhere.	Gun, 30 oz	20	$235.4912 x 30 oz
7	Akfix 840 Fire Block Akfix 2017 Akfix sheets give DIN 4102-1 B2 and "UL listed" for a 900 g pack, not the US cans; the straw can’s store page is empty.	840P gun, 25.3 oz	9	$14.991 x 12 oz

Seen in use

A reviewer's video, and where its cans sit on this page

A third-party review on YouTube by Colleens Reviews, not made or commissioned by us. It shows the cans being used; it is not a test we ran and it is not evidence for any figure on this page. Nothing loads from YouTube until you press play.

3 BEST Expanding Foams 2025 Strong, Fast & Easy to Use!Colleens Reviews on YouTube

The cans in the video

Kraken Bond Extreme Fire Block#3 on this page
Red Devil Foam & Fill Fire BlockNot a can we track
Loctite Tite Foam Gaps & CracksNot a fire block can; its own sheet says it is not a fire stopping material

The records

Each product, the claim in its own words, and what stands behind it

Every figure names its source. Where a maker publishes nothing, the record says so; a blank is a finding, not an oversight.

As an Amazon Associate I earn from qualifying purchases. That fee never sets the order or the score.

Straw cans, nothing else to buy

The tube is taped to the can. You press the trigger, you use it, and what is left in the can hardens within hours on most of these labels. This is the list for a single job.

TYTAN Professional Fire Block Extreme

On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.

Straw, 12 oz Also sold as a gun can Orange

See it on Amazon Full record, documents and prices 3 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe 12 oz straw can has its own dated sheet, which prints the same UL 723 pair and names ICC-ES ESR-3302 under its approvals; the report evaluates Fire Block Extreme for keeping wood fireblocking intact where it is penetrated, within the same limits.
Brand-channel sellerSold by Selena USA Inc, which carries only the TYTAN Professional line in our intake.
100+ ratings77 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Orange Fire Retardant Polyurethane Expanding Straw Foam, Seals Penetrations." The 24 oz listing adds "Works in -4 F."

Amazon listing titles, read September 8, 2026

What the documents state

Fire	UL 723 (ASTM E84) flame spread 15, smoke developed 10 on both the 24 oz gun sheet and the 12 oz straw sheet; both also print DIN 4102 class B3 and EN 13501-1 class FTDS 27.02.2026 and 24.02.2026
Yield	1,450 ft of 1/2 in bead from the 24 oz gun can, 80 to 110 percent post-expansion; 389 ft of 1/2 in bead from the 12 oz straw canTDS 27.02.2026 and 24.02.2026
Working range	Gun can -4 F to 113 F ambient on its sheet, -4 F to 100 F on TYTAN’s flyer; straw can 23 F to 100 F; 24-hour full cureTDS and flyer
Fireblocking test	ICC-ES ESR-3302, named on the straw sheet and on TYTAN’s fire block flyer, evaluates Fire Block Extreme under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limits: Type V-B construction under the IBC and non-rated construction under the IRC, at most 18 sq in of exposed foam per sq ft of wall, not a firestop. Both sheets say the product is not approved as a fire stopESR-3302 and TDS
Document scope	The gun sheet names the 24 oz PRO gun can and the straw sheet names the 12 oz straw can, so each can has its own dated sheetTDS 27.02.2026 and 24.02.2026

Desk note

The cheapest single fire block can here is the 12 oz straw can, and it has a dated sheet of its own beside the 24 oz gun can’s. Both print the full UL 723 result to ASTM E84, flame spread 15 and smoke developed 10; the gun can yields 1,450 ft of half-inch bead and the straw can 389 ft. The fireblocking claim has a report behind it: ICC-ES ESR-3302, named on the straw sheet, evaluates the foam under AC546 for keeping wood fireblocking intact where pipes and wires pass through it, on NFPA 286 room-corner tests. That is what this page asks of a fire block can. Read its limits with it: Type V-B construction under the IBC and non-rated construction under the IRC, at most 18 sq in of exposed foam per square foot of wall, and not a firestop, which both sheets also say. The same tables print DIN 4102 class B3 and EN 13501-1 class F, the bottom class of each, from other test systems. TYTAN gives the gun can an upper limit of 113 F on its sheet and 100 F on its flyer. The orange color is there so an inspector can recognize the can. It identifies the product; it is not a function, a test or an approval.

No tested thickness or laboratory for the UL 723 result.
ESR-3302 cites NFPA 286 test reports without printing their results.
The gun can’s upper temperature limit is 113 F on its sheet and 100 F on TYTAN’s flyer.

Documents on file

TDSTYTAN Professional Fire Block Extreme technical data sheet, 24 oz gun can · 27.02.2026
TDSTYTAN Professional Fire Block Extreme technical data sheet, 12 oz straw can · 24.02.2026
PAGETYTAN Professional Fire Block Foams flyerNames ICC-ES Report ESR-3302 beside UL 723, ASTM E84 and NFPA 286, and flame spread 15 with smoke developed 10.
ESRICC-ES Evaluation Report ESR-3302 · Reissued November 2025, revised April 2026Evaluates Fire Block, Fire Block 113 and Fire Block Extreme under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limited to Type V-B construction under the IBC and non-rated construction under the IRC; not a firestop and not a substitute for code-prescribed wood fireblocking.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
1 x 12 oz1 duplicate listing at this size	$11.85	77	Amazon

Stanley F952 Fire Block

Dated sheet with UL 723 flame spread 10 and smoke developed 15, DIN 4102-1 B2 and a 10.6 gal yield.

Straw, 12 oz and 24 oz Light red

See it on Amazon Full record, documents and prices 2 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe sheet prints a full UL 723 pair, flame spread 10 and smoke developed 15, but a surface-burning result does not establish fireblocking, and no through-penetration or room-corner test stands behind the claim. The B2 class is a German rating with no US equivalent.
Brand-channel sellerSold by Nucleus Incorporated, which carries only the Stanley line in our intake.
100+ ratings92 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Flame resistant, self-extinguishing polyurethane foam." "UL 723 Flame Spread: 10. Smoke Developed: 15." "DIN 4102-1 B2." The sheet also says the color is "easily identified by inspectors as an approved fire block penetration sealant."

Stanley technical data sheet F952, rev. 1, 25.03.2025

What the documents state

Fire	UL 723 flame spread 10, smoke developed 15; DIN 4102-1 B2; no tested thickness, report or file numberTDS rev. 1
Yield	Up to 10.6 gal, depending on temperature and humidityTDS rev. 1
Expansion	High expansion rate for wide gapsTDS rev. 1
Service	Cured foam -103 to 239 F; application 41 to 86 FTDS rev. 1
Listing	ICC-ES ESL-1058 names Stanley Fire Block Foam Sealant for surface burning at a 1/2 in bead, flame spread 25 or less and smoke developed 450 or less; the sheet does not cite it, and it is not a fireblocking testESL-1058, April 2026

Desk note

A dated sheet with a full UL 723 result, flame spread 10 and smoke developed 15, and a stated yield, which puts it ahead of most of the category on paper. The sentence about inspectors recognizing the color does more work than it looks. It calls the can an "approved fire block penetration sealant", and three separate words in that phrase are doing unearned work. Nothing is approved by being orange; no code makes color a requirement or a result. No approval, listing or evaluation report number appears on the sheet, so there is nothing to look up. And "penetration sealant" is the vocabulary of firestopping, a different product class whose systems are tested through a penetration in a rated assembly; this sheet publishes no through-penetration result, and fireblocking, draftstopping and firestopping are separate things throughout this site

The 24 oz straw listings are not covered by the 12 oz sheet.
No approval, listing or report number behind the words "approved fire block penetration sealant".

Documents on file

TDSStanley F952 Fire Block Foam Sealant, TDS · 25.03.2025 rev.1
SDSStanley F952 Fire Block Foam Sealant, SDS
ESLICC-ES Listing Report ESL-1058 · Reissued April 2026Names this foam for surface burning at a nominal 1/2 in bead: flame spread 25 or less and smoke developed 450 or less to UL 723 and ASTM E84. It is not a fireblocking test.

Sizes on Amazon, October 29, 2026 snapshot

3 of the 5 listings showed no purchase option on October 29, 2026.

Pack	Price	Ratings
1 x 12 oz1 duplicate listing at this size	$13.99	7150+ bought	Amazon
2 x 12 oz	$23.99	7150+ bought	Amazon
1 x 24 oz	no price shownout of stock when read	92	Amazon
2 x 24 oz	no price shownout of stock when read	92	Amazon
12 x 24 oz	no price shownout of stock when read	92	Amazon

Cheapest per ounce 12 x 24 oz, straw can

Kraken Bond Extreme Fire Block

Dated sheet with both UL 723 indices, flame spread 10 and smoke 15, and a bead yield for each can size it sells. That is a surface-burning result, not a fireblocking test.

Straw, 12 oz and 24 oz Light red Also in gaps and cracks

See it on Amazon See it at Walmart Full record, documents and prices 2 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe dated sheet prints a full UL 723 result, flame spread 10 and smoke developed 15, which is more than most of this set publishes. It is still a surface-burning test. The product page cites ICC-ES listing ESL-1058, which names this foam for surface burning at a 1/2 in bead; no through-penetration or room-corner test stands behind the fireblocking claim itself.
Brand-channel sellerSold by Lotus Global Trade LLC, the storefront that carries the Kraken Bond and Sprayman lines and no other brand in our intake.
100+ ratings68 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"UL Score: Flame Spread 10, Smoke Developed 15 (UL 723)." Described as a high-expansion foam for "filling, sealing, and bonding gaps."

Kraken Bond technical data sheet FR 201, dated 5.14.2026

What the documents state

Fire	UL 723 flame spread 10, smoke developed 15; no tested thickness, configuration or file numberTDS 5.14.2026
Yield	2,240 linear ft of 1/4 in bead from the 20.3 fl oz can; 1,493 ft from 13.5 fl ozTDS 5.14.2026
Expansion	High expansionTDS 5.14.2026
Shelf life	12 monthsTDS 5.14.2026
Working range	Application 41 to 86 FTDS 5.14.2026
Listing	ICC-ES ESL-1058 names this foam for surface burning at a 1/2 in bead, flame spread 25 or less and smoke developed 450 or less; it is not a fireblocking testESL-1058, April 2026

Desk note

One of six fire block sheets in the intake that print both surface-burning indices under a named standard, with Sprayman’s undated Fire Stop sheet, Stanley’s F952 sheet and three dated TYTAN sheets. This one is dated and names both cans it sells, and it is the only sheet here that states a bead yield for each of two can sizes on one page, 2,240 ft from the 20.3 fl oz can and 1,493 from the 13.5. That is the shape of a checkable claim. What it still lacks is the tested thickness and a fireblocking test: the ICC-ES listing its product page cites, ESL-1058, covers surface burning only. The brand also sells a gun-grade "Xtreme Pro" fire block (FR 202) that claims Class A to ASTM E84 with a 1/4 to 3 in gap range; we have not matched it to an Amazon listing.

No tested thickness, laboratory or report number on the sheet.
The 24 oz "cleaner included" listings had no ratings on September 7.

Documents on file

TDSKrakenBond FR201 Extreme Fire Block TDS · 5.14.2026Revision field is blank on the sheet. The file address the product page carried on September 8 returned 404 on September 14, 2026; the page now links this file, which prints the same date, 5.14.2026, the same blank revision field and both can sizes.
PAGEKraken Bond product pageThe page cites ICC ESL-1058 for its fire claim.
SDSKraken Bond Extreme Fire Foam B2 (Straw), SDS · 12.09.2023
ESLICC-ES Listing Report ESL-1058 · Reissued April 2026Names this foam for surface burning at a nominal 1/2 in bead: flame spread 25 or less and smoke developed 450 or less to UL 723 and ASTM E84. It is not a fireblocking test.

Sizes on Amazon, October 29, 2026 snapshot

3 of the 9 listings showed no purchase option on October 29, 2026.

Pack	Price	Ratings
1 x 12 ozThis listing was selling 12 x 12 oz, not the pack this row tracks, so its price is withheld1 duplicate listing at this size	price withheld	45	Amazon
2 x 12 oz	price withheld	54	Amazon
1 x 24 oz	$21.99	68	Amazon
2 x 24 oz	$36.99	68100+ bought	Amazon
12 x 24 oz	$169.99	68	Amazon
24 x 24 ozThis listing was selling 1 x 24 oz, not the pack this row tracks, so its price is withheld	price withheld	68	Amazon
48 x 24 oz	price withheld	68	Amazon
1 x 24 ozwith gun	no price shownout of stock when read	0	Amazon
2 x 24 ozwith gun	no price shownout of stock when read	0	Amazon
12 x 24 ozwith gun	no price shownout of stock when read	0	Amazon

Sprayman Fire Block Foam Sealant

The sheet prints UL 723 flame spread 10 and smoke developed 15, undated and with no tested thickness; the store still says "fireproof."

Straw, 12 oz Orange

See it on Amazon Full record, documents and prices 2 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand, without a date or revision on it
Claim checkableThe sheet prints a surface-burning pair, UL 723 flame spread 10 and smoke developed 15. This category asks for a fireblocking result, a through-penetration or room-corner method with a listing or report number, and the sheet has none. It also prints no tested thickness and no date, so neither number can be pinned to a version or a test set-up.
Brand-channel sellerSold by Lotus Global Trade LLC, the storefront that carries the Kraken Bond and Sprayman lines and no other brand in our intake.
100+ ratings37 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Class A Fire Rated (ASTM E84201 / UL Classified / ICC-ES evaluated)." Also described as "fireproof expanding foam."

sprayman.co product page, read September 8, 2026

What the documents state

Fire	The sheet prints UL 723 flame spread 10 and smoke developed 15, and DIN 4102-1 class B2. No tested thickness, no report or file number, and the sheet is undatedTDS, undated
Fire claim on the store	"Class A Fire Rated (ASTM E84201 / UL Classified / ICC-ES evaluated)"; "ASTM E84201" is not a standard designation as writtenBrand store
Yield	1,500 linear feet of 1/4 in beadTDS, undated
Cure	Tack-free 6 plus or minus 3 min (ASTM C1620), cutting time 40 min or less, full cure 24 hoursTDS, undated
Working range	Application 41 to 86 F ambient and surface; cured foam -40 to 194 FTDS, undated
Wording	The word "fireproof" appears on the brand page; no foam sealant is fireproofBrand store
Sizes	12 oz can, 1 to 12 packsBrand store

Desk note

The sheet prints UL 723 flame spread 10 and smoke developed 15, which is the same pair Kraken Bond prints; the two TYTAN sheets print 15 and 10. Two things the sheet does not carry keep the mark off: the thickness the sample was tested at, without which a surface-burning number describes an unknown assembly, and a date or revision, without which it describes an unknown formulation. And a surface-burning result is not a fireblocking result. This page is marked on whether the can can be shown to stop fire spreading through a penetration, which is a different test with a different number, and no Sprayman document answers it. The store wording is a separate problem: "fireproof" is wrong for any foam sealant, and "ASTM E84201" is not a designation as written. The sheet is on the brand page, behind a button marked TDS.

The sheet carries no tested thickness, so the flame spread and smoke figures cannot be tied to an assembly.
The sheet carries no date or revision.
The ICC-ES reference has no report number on the straw page; the gun page cites "ICC-ESL-1058."
The word "fireproof" remains on the brand page.

Documents on file

PAGESprayman product page
TDSFire Stop B2 Foam technical data sheetOne sheet serves both the straw can and the gun can. Three pages, no date and no revision printed on it.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
1 x 12 oz	$14.99	37	Amazon
2 x 12 ozThis listing was selling 1 x 12 oz, not the pack this row tracks, so its price is withheld	price withheld	3750+ bought	Amazon
12 x 12 ozThis listing was selling 1 x 12 oz, not the pack this row tracks, so its price is withheld	price withheld	37	Amazon

Akfix 840 Fire Block

2017 Akfix sheets give DIN 4102-1 B2 and "UL listed" for a 900 g pack, not the US cans; the straw can’s store page is empty.

Straw, 12 oz Also sold as a gun can Orange

See it on Amazon Full record, documents and prices 1 of 4 confirmed

Brand data sheeta safety data sheet or a brand page is published, no technical data sheet found
Claim checkableThe Akfix sheets give DIN 4102-1 class B2, a German rating with no US equivalent, and the words "UL listed" with no file number, for a 900 g pack rather than the cans sold here. ICC-ES listing ESL-1058 names the foam for surface burning only. No fireblocking test with a number that can be looked up stands behind the claim.
Brand-channel sellerSold by Wios Global Trade LLC, which carries only the Akfix line in our intake.
100+ ratings9 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Orange Color Fire Retardant Polyurethane Expanding Foam" on Amazon. The Akfix sheet: "a self-extinguishable multi-purpose polyurethane foam which provides moderate fire safety," "Conforms to fire class B2 according to DIN 4102-1," "UL listed."

Amazon listing title, read September 8, 2026; Akfix 840 technical data sheet, REV.06, 02/05/2017

What the documents state

Fire	DIN 4102-1 class B2 and "UL listed" with no file number on the Akfix sheets; no US surface-burning figure; "fire retardant" in the listing titleTDS REV.06 and listing
Document scope	The 840 and 840P sheets name a 900 g pack, not the 12 oz straw or 25.3 oz gun cans sold in the US, so their figures are not verified for these cansTDS REV.06
Listing	ICC-ES ESL-1058 names 840 and 840P FireBlock Insulating Foam Sealant for surface burning at a 1/2 in bead, flame spread 25 or less and smoke developed 450 or less; it is not a fireblocking testESL-1058, April 2026
Sizes	12 oz straw and 25.3 oz gun cans, 1 to 12 packs, with or without gunListings

Desk note

Akfix’s fire block reaches Amazon in ten listings and its own US store in an empty product page for the straw can. The sheets are elsewhere: on akfix.com, and behind the 840P gun foam page on the same store. Both are 2017 revisions that give DIN 4102-1 class B2 and the words "UL listed", and both describe a 900 g pack rather than the US cans. ICC-ES listing ESL-1058 names the foam for surface burning at a half-inch bead. None of that is a fireblocking test, and a sheet written for the cans sold here is what would move this record.

The brand store page for the 12 oz straw can has no description and no document.
No sheet names the US 12 oz or 25.3 oz cans.
Pack sizes in the listing titles changed between September 7 and 8 on two ASINs.

Documents on file

PAGEAkfix store product pageThe page has prices and no description or documents on September 8, 2026.
TDSAkfix 840 B2 Fire Rated PU Foam, technical data sheet · REV.06, 02/05/2017On akfix.com. Names a 900 g pack.
TDSAkfix 840P B2 Fire Rated PU Gun Foam, technical data sheet · REV.06, 04/05/2017Linked from the 840P gun foam page on the Akfix US store and published on akfix.com. Names a 900 g pack.
ESLICC-ES Listing Report ESL-1058 · Reissued April 2026Names this foam for surface burning at a nominal 1/2 in bead: flame spread 25 or less and smoke developed 450 or less to UL 723 and ASTM E84. It is not a fireblocking test.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
1 x 12 oz	$14.99	36	Amazon
2 x 12 oz	$24.99	36	Amazon
12 x 12 oz	no price shown	36	Amazon

Gun cans, a foam gun is needed

These thread onto a foam gun, which is a separate purchase from about $15 to $56. In return you get a bead you can meter, and on most of these the can stays usable on the gun for weeks. This is the list for repeat work.

TYTAN Professional Fire Block Extreme

On September 7 the cheapest single fire block can, at $11.85, was the 12 oz straw can; each can has a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.

gun, 24 oz Also sold as a straw can Orange

See it on Amazon Full record, documents and prices 3 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe dated gun sheet gives a full UL 723 pair, the yield and the working range for the 24 oz can, and ICC-ES ESR-3302 evaluates this foam for keeping wood fireblocking intact where it is penetrated, on NFPA 286 room-corner test reports. That is a fireblocking result with a report number that can be looked up, within the report’s limits: Type V-B and non-rated residential construction, at most 18 sq in of exposed foam per sq ft of wall, and not a firestop.
Brand-channel sellerSold by Selena USA Inc, which carries only the TYTAN Professional line in our intake.
100+ ratings77 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Orange Fire Retardant Polyurethane Expanding Straw Foam, Seals Penetrations." The 24 oz listing adds "Works in -4 F."

Amazon listing titles, read September 8, 2026

What the documents state

Fire	UL 723 (ASTM E84) flame spread 15, smoke developed 10 on both the 24 oz gun sheet and the 12 oz straw sheet; both also print DIN 4102 class B3 and EN 13501-1 class FTDS 27.02.2026 and 24.02.2026
Yield	1,450 ft of 1/2 in bead from the 24 oz gun can, 80 to 110 percent post-expansion; 389 ft of 1/2 in bead from the 12 oz straw canTDS 27.02.2026 and 24.02.2026
Working range	Gun can -4 F to 113 F ambient on its sheet, -4 F to 100 F on TYTAN’s flyer; straw can 23 F to 100 F; 24-hour full cureTDS and flyer
Fireblocking test	ICC-ES ESR-3302, named on the straw sheet and on TYTAN’s fire block flyer, evaluates Fire Block Extreme under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limits: Type V-B construction under the IBC and non-rated construction under the IRC, at most 18 sq in of exposed foam per sq ft of wall, not a firestop. Both sheets say the product is not approved as a fire stopESR-3302 and TDS
Document scope	The gun sheet names the 24 oz PRO gun can and the straw sheet names the 12 oz straw can, so each can has its own dated sheetTDS 27.02.2026 and 24.02.2026

Desk note

No tested thickness or laboratory for the UL 723 result.
ESR-3302 cites NFPA 286 test reports without printing their results.
The gun can’s upper temperature limit is 113 F on its sheet and 100 F on TYTAN’s flyer.

Documents on file

TDSTYTAN Professional Fire Block Extreme technical data sheet, 24 oz gun can · 27.02.2026
TDSTYTAN Professional Fire Block Extreme technical data sheet, 12 oz straw can · 24.02.2026
PAGETYTAN Professional Fire Block Foams flyerNames ICC-ES Report ESR-3302 beside UL 723, ASTM E84 and NFPA 286, and flame spread 15 with smoke developed 10.
ESRICC-ES Evaluation Report ESR-3302 · Reissued November 2025, revised April 2026Evaluates Fire Block, Fire Block 113 and Fire Block Extreme under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limited to Type V-B construction under the IBC and non-rated construction under the IRC; not a firestop and not a substitute for code-prescribed wood fireblocking.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
12 x 24 oz3 duplicate listings at this size	$111.00	0	Amazon

TYTAN Professional Fire Block 113

Contractor case of twelve 24 oz gun cans, rated to 113 F, on a dated sheet with both UL 723 indices, and ICC-ES ESR-3302 covers the foam for fireblocking.

Gun, 24 oz Orange

See it on Amazon Full record, documents and prices 3 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe dated sheet ties a full UL 723 result to the 24 oz can this listing sells, and ICC-ES ESR-3302, which TYTAN names, evaluates this foam for keeping wood fireblocking intact where it is penetrated, on NFPA 286 room-corner test reports. That is a fireblocking result with a report number that can be looked up, within the report’s limits: Type V-B and non-rated residential construction, at most 12 sq in of exposed foam per sq ft of wall, and not a firestop.
Brand-channel sellerSold by Selena USA Inc, which carries only the TYTAN Professional line in our intake.
100+ ratings22 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Orange Fire Blocking Foam Sealant ... Extreme Heat Polyurethane."

Amazon listing title, read September 8, 2026

What the documents state

Fire	UL 723 (ASTM E84) flame spread 15, smoke developed 10; the same sheet prints DIN 4102 class B3 and EN 13501-1 class FTDS 24.02.2026
Yield	1,207 ft of 1/2 in bead, or 452 ft of linear 1/2 in bead, from the 24 oz canTDS 24.02.2026
Working range	Rated to 113 F ambient and can temperature; 24-hour full cureTDS 24.02.2026
Fireblocking test	ICC-ES ESR-3302, named on TYTAN’s fire block flyer, evaluates Fire Block 113 under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limits: Type V-B construction under the IBC and non-rated construction under the IRC, at most 12 sq in of exposed foam per sq ft of wall, not a firestop. The sheet says the product "is not an approved fire stop sealant"ESR-3302 and TDS 24.02.2026
Document scope	The sheet names the 24 oz PRO gun can, which is the can in the listing hereTDS 24.02.2026

Desk note

A fire block can whose sheet prints a complete surface-burning result, UL 723 to ASTM E84 at flame spread 15 and smoke developed 10, and whose maker names an evaluation report for the fireblocking claim itself. ICC-ES ESR-3302 assesses the foam under AC546, the criteria for foam used to keep wood fireblocking intact where pipes and wires pass through it, on NFPA 286 room-corner tests. That is what this page asks of a fire block can. Read the report’s limits with it: Type V-B construction under the IBC and non-rated construction under the IRC, at most 12 sq in of exposed foam per square foot of wall, and not a firestop, which the sheet also says in its own words. Read the rest of the sheet’s table too: it prints DIN 4102 class B3, the lowest class of that standard, and EN 13501-1 class F, the class for no performance determined; those come from other test systems and sit beside the UL 723 pair without contradicting it. What it is built for is heat: 113 F ambient and can temperature without shrinking, which is the reason the number is in the name.

The sheet gives no tested thickness or laboratory for the UL 723 result.
ESR-3302 cites NFPA 286 test reports without printing their results.

Documents on file

TDSTYTAN Professional Fire Block 113 technical data sheet · 24.02.2026
PAGETYTAN Professional Fire Block Foams flyerNames ICC-ES Report ESR-3302 beside UL 723, ASTM E84 and NFPA 286, and flame spread 15 with smoke developed 10.
ESRICC-ES Evaluation Report ESR-3302 · Reissued November 2025, revised April 2026Evaluates Fire Block, Fire Block 113 and Fire Block Extreme under AC546 for keeping wood fireblocking intact where it is penetrated, on NFPA 286 test reports. Limited to Type V-B construction under the IBC and non-rated construction under the IRC; not a firestop and not a substitute for code-prescribed wood fireblocking.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
12 x 24 oz3 duplicate listings at this size	$107.00	22	Amazon

Sprayman Pro Fire Block Foam

Class A on the store, B2 on Amazon, and one undated sheet that prints both.

Gun, 20 oz Orange

See it on Amazon Full record, documents and prices 2 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand, without a date or revision on it
Claim checkableThe document that reconciles the two labels exists and still does not earn the mark. It prints a surface-burning pair under UL 723 and a reaction-to-fire class under DIN 4102-1, with no tested thickness, no report or file number and no date. This category asks for a fireblocking result, which is a different test, and no Sprayman document answers it.
Brand-channel sellerSold by Lotus Global Trade LLC, the storefront that carries the Kraken Bond and Sprayman lines and no other brand in our intake.
100+ ratings65 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

The brand store says "Class A Fire Rated ... ASTM E84201 and UL Classified (ICC-ESL-1058)." The Amazon title for the same can says "B2 Fire Rated Foam."

sprayman.co and the Amazon listing title, read September 8, 2026

What the documents state

Fire	The sheet prints both: UL 723 flame spread 10 with smoke developed 15, and DIN 4102-1 class B2. No tested thickness, no report number, no dateTDS, undated
Fire claim by channel	Class A on the brand store, B2 in the Amazon title, for the same 20 oz canBrand store vs listing
Yield	1,500 linear feet of 1/4 in beadTDS, undated
Working range	Application 41 to 86 F ambient and surface; cured foam -40 to 194 FTDS, undated
Sizes	20 oz can, 2 and 12 packs, with or without gunListings

Desk note

The same can is described as Class A on the brand site and B2 in the Amazon title. Those answer different questions: Class A is a US surface-burning result under ASTM E84 or UL 723, B2 is a German reaction-to-fire class under DIN 4102-1, and one product can hold results under both. The maker's own sheet prints exactly that: UL 723 flame spread 10 and smoke developed 15 on one line, DIN 4102-1 B2 on the next. The two channels are each quoting a different half of the same sheet, not contradicting each other. What is missing is the thickness the surface-burning sample was tested at, a report or file number for either result, and a date on the sheet. And neither result is a fireblocking result, which is what this page marks.

The sheet carries no tested thickness, no report number and no date.
No fireblocking test is published for this can, which is the test this category asks for.

Documents on file

PAGESprayman product page
TDSFire Stop B2 Foam technical data sheetOne sheet serves both the straw can and the gun can. Three pages, no date and no revision printed on it.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
2 x 20 oz	$25.99	65	Amazon
12 x 20 oz	$129.99	65	Amazon
2 x 20 ozwith gunThis listing was selling 1 x 20 oz, not the pack this row tracks, so its price is withheld3 duplicate listings at this size	price withheld	65	Amazon

Stanley F952P Fire Block Pro

Gun version whose sheet drops the UL line and says "moderate fire safety."

Gun, 24 oz Light red

See it on Amazon Full record, documents and prices 2 of 4 confirmed

Brand data sheeta technical data sheet is published by the brand
Claim checkableThe pro sheet carries no US figure at all, and no fireblocking test on either sheet. The straw sheet has a surface-burning number, the gun sheet does not.
Brand-channel sellerSold by Nucleus Incorporated, which carries only the Stanley line in our intake.
100+ ratings0 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Self-extinguishable aerosol polyurethane foam." "Provides moderate fire safety." "DIN 4102-1 B2."

Stanley technical data sheet F952P, rev. 1, 25.03.2025

What the documents state

Fire	DIN 4102-1 B2 only; no UL 723 or ASTM E84 line on the pro sheetTDS rev. 1
Wording	"Provides moderate fire safety," the brand’s own phraseTDS rev. 1
Pack	Net 24 oz / 680 g / 600 ml; shelf life 12 monthsTDS rev. 1
Listing	ICC-ES ESL-1058 names Stanley Fire Block Professional Foam Sealant for surface burning at a 1/2 in bead, flame spread 25 or less and smoke developed 450 or less; the pro sheet does not cite it, and it is not a fireblocking testESL-1058, April 2026

Desk note

The gun version of the F952 is documented, but its sheet drops the UL 723 line that the straw sheet carries and replaces it with "moderate fire safety." We read that as honest and as a reason not to assume the two cans share a test result.

No UL 723 or ASTM E84 figure on the pro sheet.

Documents on file

TDSStanley F952P Fire Block Foam Sealant Pro, TDS · 25.03.2025 rev.1
SDSStanley F952P Fire Block Foam Sealant Pro, SDS
ESLICC-ES Listing Report ESL-1058 · Reissued April 2026Names this foam for surface burning at a nominal 1/2 in bead: flame spread 25 or less and smoke developed 450 or less to UL 723 and ASTM E84. It is not a fireblocking test.

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
2 x 24 oz2 duplicate listings at this size	$25.99	0	Amazon
1 x 24 ozwith gun	$33.99	24	Amazon
2 x 24 ozwith gun	$64.90	1	Amazon
12 x 24 ozwith gun	$129.99	26	Amazon

Great Stuff PRO Gaps & Cracks

Orange 3 in gun foam that DuPont calls fireblock formulated; three test methods named, no figures, sold through a reseller.

Gun, 24 oz and 30 oz Orange Also in gaps and cracks

See it on Amazon See it at Walmart Full record, documents and prices 1 of 4 confirmed

Brand data sheeta safety data sheet or a brand page is published, no technical data sheet found
Claim checkableThis is the only can in the set that names the tests the claim actually needs, a modified ASTM E814 and UL 1715 alongside ASTM E84. It publishes no index values, no file or report number and no dated sheet, so there is still nothing to look up.
Brand-channel sellerSold by M&P Export Management Corporation, a reseller that lists Great Stuff, Enerfoam and DAP products. The brand itself is not the seller of record.
100+ ratings528 ratings on the anchor listing

The claim, in the seller's words

"Expands to fill, seal, and insulate gaps up to 3 inch (76mm)." "Fireblock formulated and orange-colored for easy inspection identification." "Tested according to ASTM E84, ASTM E814 (modified), UL 1715."

DuPont Great Stuff PRO product page, read September 8, 2026

What the documents state

Gap size	Up to 3 in with the PRO dispensing gunBrand page
Fire	Three test methods named, ASTM E84, ASTM E814 modified and UL 1715; no index values or report numbers on the pageBrand page
Reuse	Reusable for 30 days while left on the gunBrand page
Cure	Tack-free in 3 to 10 min; trimmable in one hourBrand page
Listing	"UL classified" with no category and no file number, which is the same gap we flag on other brandsBrand page

Desk note

The one product that belongs to both the gap filler and the fire block sets by its own description: a 3 in gun foam that is "fireblock formulated." It is also the best-known orange can in the trade. On Amazon it reaches buyers through a reseller rather than DuPont, in listings whose titles do not state the pack count, so the same "24 oz" title can be a single can at one price and a case at another. Read the listing body, not the title, before you compare prices.

The 30 oz can sold on Amazon does not appear on the brand page, which lists 24 oz only.
For fire block use the buyer needs the tested configuration and the index values. DuPont names the methods only; the complete version of such a claim, with file numbers, exists in the trade (Loctite publishes one for its Pro Gaps & Cracks Foam), so this is a publishing choice rather than a limit of the category.

Documents on file

SDSPRO Gaps & Cracks for PRO Dispensing Gun, SDS 000001156764SDS only. No technical data sheet on the brand page.
PAGEGreat Stuff PRO Gaps & Cracks product page

Sizes on Amazon, October 29, 2026 snapshot

Pack	Price	Ratings
12 x 24 oz	$157.95	4	Amazon
pallet, 16 cases of 24 oz	$2410.49	298	Amazon
24 oz, pack count not in the title	$157.95	298200+ bought	Amazon
12 x 30 oz	$194.29	0	Amazon
30 oz, pack count not in the title	$194.28	58	Amazon
complete kit, 24 oz can with gun, cleaner and gloveswith gun	$79.29	264200+ bought	Amazon
24 oz kit, pack count not in the titlewith gun2 duplicate listings at this size	$199.00	528100+ bought	Amazon
1 x 30 ozwith gunThis listing was selling 12 x 30 oz, not the pack this row tracks, so its price is withheld	price withheld	39	Amazon

Enerfoam 30 oz Fireblock Rated Sealant

30 oz gun foam sold through a reseller; DuPont makes it and calls it a fireblock on its own page, with no standard and no indices anywhere.

Gun, 30 oz Also in gaps and cracks

See it on Amazon 1 of 4 confirmed

Brand data sheetbrand documents not yet checked
Claim checkableDuPont makes it and publishes a page for it, where the company itself calls the foam recognized as a fireblock and explains what a fireblock does. That page names no standard and prints no flame spread or smoke index, and its information sheets sit behind a script rather than a file, so the listing claim still has no number a reader can check.
Brand-channel sellerDuPont makes Enerfoam and lists it on its own products site. The Amazon listing is run by M&P Export Management Corporation, a reseller that also carries Great Stuff and DAP, so the seller of record is not the maker.
100+ ratings20 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Fireblock Rated, Polyurethane Expanding Foam Sealant. Gaps and Cracks Filler."

Amazon listing title, read September 8, 2026

What the documents state

Sizes	12-pack of 30 oz cans, $235.49 with 20 ratings on September 7; an AWF PRO branded kit with gunListings

Desk note

A 30 oz gun foam sold through the same reseller that lists Great Stuff PRO. The maker is DuPont, which was worth five minutes to establish, and DuPont calls the foam recognized as a fireblock on its own page and describes what a fireblock does. What neither the page nor the listing gives is a standard or a pair of indices, so the strongest thing anyone can say about this can is that its maker says the word.

DuPont links product information sheets and safety data sheets behind a script; none resolved to a file we could read.
No standard, flame spread or smoke index appears on the maker page or the listing.

Documents on file

Brand documents not yet checked.

Sizes on Amazon, October 29, 2026 snapshot

1 of the 2 listings showed no purchase option on October 29, 2026.

Pack	Price	Ratings
12 x 30 oz	$235.49	20	Amazon
12 x 30 ozwith gun2 duplicate listings at this size	no price shownout of stock when read	11	Amazon

Akfix 840 Fire Block

2017 Akfix sheets give DIN 4102-1 B2 and "UL listed" for a 900 g pack, not the US cans; the straw can’s store page is empty.

840P gun, 25.3 oz Also sold as a straw can Orange

See it on Amazon Full record, documents and prices 1 of 4 confirmed

Brand data sheeta safety data sheet or a brand page is published, no technical data sheet found
Claim checkableThe Akfix sheets give DIN 4102-1 class B2, a German rating with no US equivalent, and the words "UL listed" with no file number, for a 900 g pack rather than the cans sold here. ICC-ES listing ESL-1058 names the foam for surface burning only. No fireblocking test with a number that can be looked up stands behind the claim.
Brand-channel sellerSold by Wios Global Trade LLC, which carries only the Akfix line in our intake.
100+ ratings9 ratings on the anchor listing, under the 100 we ask for

The claim, in the seller's words

"Orange Color Fire Retardant Polyurethane Expanding Foam" on Amazon. The Akfix sheet: "a self-extinguishable multi-purpose polyurethane foam which provides moderate fire safety," "Conforms to fire class B2 according to DIN 4102-1," "UL listed."

Amazon listing title, read September 8, 2026; Akfix 840 technical data sheet, REV.06, 02/05/2017

What the documents state

Fire	DIN 4102-1 class B2 and "UL listed" with no file number on the Akfix sheets; no US surface-burning figure; "fire retardant" in the listing titleTDS REV.06 and listing
Document scope	The 840 and 840P sheets name a 900 g pack, not the 12 oz straw or 25.3 oz gun cans sold in the US, so their figures are not verified for these cansTDS REV.06
Listing	ICC-ES ESL-1058 names 840 and 840P FireBlock Insulating Foam Sealant for surface burning at a 1/2 in bead, flame spread 25 or less and smoke developed 450 or less; it is not a fireblocking testESL-1058, April 2026
Sizes	12 oz straw and 25.3 oz gun cans, 1 to 12 packs, with or without gunListings

Desk note

The brand store page for the 12 oz straw can has no description and no document.
No sheet names the US 12 oz or 25.3 oz cans.
Pack sizes in the listing titles changed between September 7 and 8 on two ASINs.

Documents on file

PAGEAkfix store product pageThe page has prices and no description or documents on September 8, 2026.
TDSAkfix 840 B2 Fire Rated PU Foam, technical data sheet · REV.06, 02/05/2017On akfix.com. Names a 900 g pack.
TDSAkfix 840P B2 Fire Rated PU Gun Foam, technical data sheet · REV.06, 04/05/2017Linked from the 840P gun foam page on the Akfix US store and published on akfix.com. Names a 900 g pack.
ESLICC-ES Listing Report ESL-1058 · Reissued April 2026Names this foam for surface burning at a nominal 1/2 in bead: flame spread 25 or less and smoke developed 450 or less to UL 723 and ASTM E84. It is not a fireblocking test.

Sizes on Amazon, October 29, 2026 snapshot

1 of the 6 listings showed no purchase option on October 29, 2026.

Pack	Price	Ratings
1 x 25.3 oz	$14.99	43	Amazon
2 x 25.3 oz	$25.99	8	Amazon
6 x 25.3 oz	$74.90	9	Amazon
12 x 25.3 oz	$124.79	9	Amazon
6 x 25.3 ozwith gunThis listing was selling 2 x 25.3 oz, not the pack this row tracks, so its price is withheld1 duplicate listing at this size	price withheld	9	Amazon
12 x 25.3 ozwith gun	no price shownout of stock when read	6	Amazon

Not listed, and why

Products we know of that are not on this page

Great Stuff Fireblock (the consumer 12 oz can, tested to ASTM E84, ASTM E814 modified and UL 1715 per the brand page) was not in the intake.
Loctite Pro Gaps & Cracks Foam is the clearest fire block sheet we have read: UL 723 flame spread 5 and smoke developed 0, the tested bead configuration, UL file numbers for both the E84 and the modified E814 tests, and the IRC and IBC sections it addresses. It was not in the Amazon intake, so it is not listed, and it shows what a complete claim looks like.
Kraken Bond Xtreme Pro Fire Block FR 202, a gun can claiming Class A to ASTM E84 with a 1/4 to 3 in gap range, is on the brand store and has not been matched to an Amazon listing.
Sprayman X-Climate Pro Fire Block is on the brand store with a technical data sheet of its own and was not in the September 7 intake, so it has no record here. It is on the list for the next one.

Questions and answers

Fire block foam questions, answered

Every answer comes from a maker’s data sheet, safety data sheet or manual, or from the records on this page, and says which.

Ask your own

Can I use fire block foam around electrical wires, outlet boxes and low-voltage cable? Buyer question

Most of the makers list electrical work as a use, but none of their documents covers low-voltage cable, cable jackets or foam inside a box. Seven of the nine fire block data sheets we read name it: Stanley’s F952 sheet says "Ideal for penetrations (HVAC, electrical and plumbing), insulating electrical outlets and water pipes," the Kraken Bond, Stanley F952P, Sprayman and both Akfix sheets list insulating electrical outlets, and TYTAN’s Fire Block 113 sheet lists "Sealing around electrical boxes and wiring penetrations." The two TYTAN Fire Block Extreme sheets name no electrical use. Whether a particular box or cable run may be foamed is an electrical code question for the local code official.
Will an inspector accept fire block foam as fireblocking? Buyer question

That is the local code official’s decision, and ICC-ES listing ESL-1058 says so in its own words: "Approval of the product’s use is the sole responsibility of the local code official." That listing names Kraken Bond Extreme Fire Block, Stanley’s fire block foams and Akfix 840 for surface burning at a nominal half-inch bead, and adds that "The listing addresses only conformance with the standards and code sections noted above." The report written for the fireblocking use itself is TYTAN’s ESR-3302, which covers Fire Block, Fire Block 113 and Fire Block Extreme "for maintaining the integrity of penetrations of wood fireblocking," requires the packaging to carry "the evaluation report number (ESR-3302)" and says the maker’s installation instructions "must be available at the jobsite at all times during installation." The same report limits the foam to Type V-B construction under the IBC and non-rated construction under the IRC, and says it "is not intended for use as an alternative to wood fireblocking prescribed by the applicable code."
Which holes actually need fire block foam? Buyer question

The building code decides which openings need fireblocking and the local code official applies it; the documents only say where each foam is meant to go. TYTAN’s evaluation report ESR-3302 covers the "annular space created by the penetration of wood fireblocking by pipes and conduits," says the foam must "completely fill the annular space for the full depth of the plate that has been penetrated" and allows beads of "maximum 2-inch-wide-by-2-inch-thick." Stanley’s F952 sheet lists "Partitions and stud walls, top and bottom stair stringers" and says the foam "SEALS SERVICE PENETRATIONS BETWEEN FLOORS," and TYTAN’s Fire Block Extreme 12 oz sheet lists "Sealing air leaks between floors and walls as required by building code." No sheet says which openings in a particular house must be fireblocked.
Can I use fire block foam as ordinary gap filler or insulation, for example around a window? Buyer question

Most of the makers say yes: seven of the nine fire block data sheets we read list door and window frames as a use, in words such as Kraken Bond’s "Fixing and insulating door and window frames," and TYTAN’s Fire Block Extreme 24 oz sheet says the foam "is safe to be used around windows and doors." Stanley’s F952 sheet prints an R-value of "~4.1 per in." and the three TYTAN sheets print "R value 4 - 5," none of them with a test method beside the figure. All three TYTAN sheets also say "DOOR AND WINDOWS FITTING WITHOUT USING MECHANICAL COUPLING IS FORBIDDEN," so on those cans the foam seals around a frame that is fastened another way. TYTAN Fire Block 113 and the Fire Block Extreme 12 oz straw can name no window use.
How much does fire block foam expand? Buyer question

Of the nine fire block data sheets we read, only TYTAN’s three print a figure: post-expansion of "120 - 150" percent for Fire Block 113, "80 - 110" for the Fire Block Extreme 24 oz gun can and "240 - 270" for the Fire Block Extreme 12 oz straw can, all to EN 17333-2:2020. Both Extreme sheets still describe "minimal post-expansion," the straw sheet beside its 240 - 270 figure. Kraken Bond, Stanley F952, Sprayman and Akfix 840 say only that the foam has a high expansion rate, and the Stanley F952P and Akfix 840P gun sheets say nothing about expansion. For open woodwork the TYTAN sheets add that "gaps >1.18 in (3 cm) are not recommended" and "Gaps >1.97 in (5cm) are unacceptable," although the Extreme sheets also call the foam "capable of filling gaps up to three inches."
Can I use fire block foam around PVC, CPVC or ABS pipes? Buyer question

The sheets speak only to adhesion, not to chemical compatibility with a pipe, and only TYTAN names pipe plastics at all. TYTAN’s Fire Block Extreme 12 oz straw sheet lists "glass, vinyl, PVC, CPVC, plastics and more" among the materials the foam adheres to, its 24 oz sheet and the Fire Block 113 sheet name PVC without CPVC, and all three say "The foam displays lack of adhesion to polyethylene, polypropylene, polyamide, silicone and Teflon." No fire block sheet we read mentions ABS. The Kraken Bond, Stanley, Sprayman and Akfix sheets list "water pipes" as a use without naming a pipe material, and TYTAN’s ESR-3302 covers penetrations "by pipes and conduits" without naming one either.
Which fire block foam prints a complete surface-burning result? From the records

Seven of the listed cans do, on six sheets. Kraken Bond Extreme Fire Block prints UL 723 flame spread 10 and smoke developed 15 in a dated sheet that names both of its cans. Sprayman Fire Block and Pro Fire Block share one sheet that prints the same pair, 10 and 15, with no date or revision; the same sheet also prints DIN 4102-1 class B2, which is why the brand store says Class A and the Amazon title says B2 for one can. Stanley F952 prints the same pair, 10 and 15, on a dated sheet. TYTAN Fire Block 113 and Fire Block Extreme print flame spread 15 and smoke developed 10 in dated sheets for their 24 oz gun cans, and a third dated sheet prints the same pair for the Extreme 12 oz straw can. Great Stuff PRO names three methods with no figures. None of the listed cans prints the tested thickness. A surface-burning pair is not the fireblocking test this page is marked on, and only the TYTAN foams carry that mark: ICC-ES ESR-3302 evaluates them for keeping wood fireblocking intact where it is penetrated, within Type V-B and non-rated residential construction.
What does DIN 4102-1 B2 or B3 mean on a US can? From the records

It is a German reaction-to-fire class from a different test system. B3 is the lowest class and B2 sits above it. Neither is a US surface-burning result and neither maps onto Class A, B or C, so a can that publishes only a DIN class has not told you how it performs under ASTM E84. A product can hold results under both systems; they answer different questions.
Why are Class A and B2 both claimed for the same Sprayman can? From the records

The brand store says Class A and the Amazon title says B2 for the 20 oz Pro Fire Block can. Those are results from two different test systems, ASTM E84 or UL 723 in the US and DIN 4102-1 in Germany, and one product can hold both. Sprayman's own sheet prints both on consecutive lines, UL 723 flame spread 10 and smoke developed 15, then DIN 4102-1 B2, so each channel is quoting half of the same document. The problem is not that they conflict; it is that the sheet carries no date, no tested thickness and no report number, so a reader cannot pin either result to a version or a test set-up.
Is orange foam required by code? From the records

No. Orange is what the trade uses so an inspector can recognize a can sold as fireblocking foam at a glance. The color identifies the product; it is not a function, a test result or an approval. No code makes fire block foam orange, and no orange foam is fire block because of its color. The document decides.

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Fire block foam vs regular foamEach brand’s fire block can set against the same brand’s gap filler, from their own sheets: surface-burning results, German classes, ICC-ES listings, fireblocking evaluations and the price per ounce in the same pack.

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