What does B1 mean on a
fire rated expanding foam?
B1 is the flammability
classification from DIN 4102 for building materials that resist ignition and
limit flame spread. A B1 fire rated expanding foam will not propagate flame and
forms a stable structure under sustained heat. SP7066S2 also carries Bs1d0 to
EN 13501-1+A1:2010, which is the equivalent European reaction-to-fire class
with the "s1" indicating limited smoke and "d0" indicating
no flaming droplets. Both classifications appear on the TDS.
Is fireproof expanding
foam the same as fire rated expanding foam?
Yes. The terms fireproof
expanding foam, fire resistant expanding foam, fire retardant expanding foam,
and fire rated foam all describe the same category of product. The technical
classifications on SP7066S2 are B1 per DIN 4102 (reaction to fire), Bs1d0 per
EN 13501-1 (reaction to fire), and EI240 per EN 13501-2 (fire resistance).
Trade buyers tend to search using whichever phrase they were taught on site.
Is this an intumescent
foam?
Not in the strict sense.
Intumescent products swell significantly under heat to seal a gap by expansion
at the moment of fire. SP7066S2 is a B1 fire rated PU foam that already fills
the gap at install time and resists ignition and flame spread per its DIN 4102
B1 and EN 13501-1 Bs1d0 classifications. The two product types serve
overlapping use cases and trade buyers sometimes search for "intumescent
foam" when they actually need a fire rated expanding foam, so we cover
both terms here. For projects that specifically require an intumescent grout or
sealant, the joint detail will call it out on the design.
Will this fire foam stop a fire for four hours?
The EI240 rating means a tested joint detail using SP7066S2 held both flame integrity (E) and insulation (I) for 240 minutes (four hours) under EN 13501-2 test conditions. The test geometry recorded in the TDS is gaps 10 mm wide x 200 to 240 mm deep, or 20 mm wide x 240 mm deep, in aerated concrete block construction. Real-world performance depends on whether the joint detail matches that tested configuration. For a verified joint design, refer to the test certificate or speak to a fire engineer.
Can I use B1 fire rated foam outside a fire compartment?
Yes. SP7066S2 performs as a standard high-yield PU foam outside fire-rated work, so excess stock from a fire-compartment job is not wasted. The pink colour makes fire-rated joints visible at inspection.
How does B1 fire rated foam compare with B3 expanding foam?
B3 is the standard, non-rated PU foam class. B3 foam burns and contributes to fire spread, so it cannot be used where the joint detail crosses a fire compartment line. SP7066S2 (B1) is the rated product for that work. For a B3 gun-grade option for non-rated joints, see the STICK2 Expanding Gun Foam Sealant.
What gun and cleaner does this foam need?
Any standard PU foam applicator gun. We recommend the professional foam applicator gun paired with STICK2 foam gun cleaner. Clean the gun within 5 minutes of pausing dispensing, because the TDS notes that uncured foam in the gun must be cleaned at that interval or it will start to set.
How much area does a 750ml can cover?
Free-foaming yield is 35 to 42 litres per can. In a defined 35 mm wide x 1000 mm long x 35 mm deep gap the yield is 20 to 26 litres. Plan around the gap-yield figure for fire-stopping work because the foam expands less when constrained in a joint than when free-foaming on a test panel.
Where can I download the TDS and fire test data?
The Technical Data Sheet and MSDS are available on the Downloads section of this product page. The TDS includes the full B1, Bs1d0 and EI240 classification references, exact test geometries, application temperatures, and storage requirements. Bring the relevant certificate to building sign-off if the inspector requires written evidence of the fire rating.
