• B1 flammability class to DIN 4102, plus Bs1d0 to EN 13501-1+A1:2010, the two reaction-to-fire classifications fire engineers expect on a fire rated expanding foam.
• EI240 fire resistance to EN 13501-2+A1:2008 (test method EN 1366-4:2008) for linear joints in aerated concrete block construction.
• Free-foaming yield 35 to 42 litres per 750ml can. In a defined 35 mm wide x 1000 mm long x 35 mm deep gap the yield is 20 to 26 litres, the working figure for fire-stopping plans.
• Secondary expansion 180 to 210% per the TDS, so dispensed volume increases approximately 1.8 to 2.1 times during cure.
• Heat conductivity 0.036 W/mK, dimensional stability 5% or less, fine-cellular cured structure.
• Skin formation in 10 minutes or less; cutting time 60 minutes or less; full cure in 24 hours at +23 °C and 50% relative humidity.
• One-component, moisture-cured polyurethane. Cures on humidity present in the air, so a light water mist on the substrate gives the most reliable cure.
• Gun-grade format fits a standard PU foam applicator gun for controlled bead width and clean cut-off.
• Cured colour pink for visible identification of fire-rated joints at inspection and sign-off.
• Adheres to brick, concrete, plaster, wood, metals, styrofoam, hard PVC, and rigid PUR.

SP7066S2 B1
fire rated expanding foam dispenses through a standard PU foam applicator gun.

Before you start. Wear gloves
and eye protection. Have a sharp knife, foam gun cleaner, and the foam gun
ready before you screw the can on.

Check the temperature. Can and
applicator should be at +10 °C to +30 °C, with the optimum around +20 °C.
Ambient and substrate temperature also +10 °C to +30 °C. The TDS does not
approve application below +10 °C, so do not start below this band.

Prepare the joint. First, clean
and degrease the substrate. Then lightly sprinkle the surface with water (at
application temperature above 0 °C). Moisture is what cures the foam, so a damp
substrate produces a more reliable cure than a dry one.

Shake and load. Shake the can
vigorously for 10 to 20 seconds, valve facing down. Next, screw the can into a
clean foam gun. We recommend the professional foam applicator gun for
adjustable flow.

Apply with the valve down. Working
position is valve facing down. For vertical gaps, fill from the bottom moving
upwards. Do not fill the entire gap, because the foam expands during cure
(secondary expansion 180 to 210%).

Gap Rules

For door and window fitting, the gap between the
framing and the frame must be a minimum of 10 mm and a maximum of 30 mm.

Gaps wider than 30 mm should be filled bottom to top
in a zigzag pattern.

Gaps wider than 50 mm are not permitted.

Door and window fitting without mechanical coupling is
not permitted, because the foam alone can distort the frame during cure.

Pause handling. If you stop
dispensing for more than 5 minutes, clean the nozzle with foam cleaner before
resuming. Cured foam in the gun ruins the tool.

Skin, cut, cure. Skin formation
happens in 10 minutes or less. The foam is cuttable in 60 minutes or less, full
cure happens at 24 hours. Trim flush with a sharp knife once cuttable. Cured
foam can only be removed mechanically.

Clean the gun. Use the STICK2 foam gun cleaner immediately after the
last bead. Uncured residue inside the gun cures hard and ends the tool's life.

UV protection. Immediately
after full cure, secure the foam against UV by plastering or painting over it.
UV exposure ages and degrades the cured foam.

Ventilation and storage. Do not use in
spaces without fresh air access, in poorly ventilated areas, or in direct
sunlight. Store unopened cans upright (valve facing up) in a dry place between
+5 °C and +30 °C. Storage above +30 °C shortens shelf life. Cans can be stored
at -5 °C for no more than 7 days (excluding transport). Do not store cans above
+50 °C or near open flame. Do not store inside the passenger compartment of a
vehicle, use the boot.

• Product code: SP7066S2 (TDS reference SP7066)
• Size: 750 ml gun-grade aerosol can
• Pack options: Single, 3 Pack, 3 Pack with Applicator,
  6 Pack, 6 Pack with Applicator and Cleaner, 12 Pack, 12 Pack with Applicator
  and Cleaner
• Reaction to fire (DIN 4102): B1, tested for linear
  gaps maximum 30 mm wide and 80 mm deep between monolithic, mineral or metal
  construction materials
• Reaction to fire (EN 13501-1+A1:2010): Bs1d0
• Fire resistance (EN 13501-2+A1:2008, EN 1366-4:2008):
  EI240, tested for gaps 10 mm wide x 200 to 240 mm deep, or 20 mm wide x 240 mm
  deep, in aerated concrete block construction
• Chemistry: One-component polyurethane, moisture-cured,
  homogeneous fine-cellular structure
• Yield (free foaming): 35 to 42 litres per can
• Yield in 35 x 1000 x 35 mm gap: 20 to 26 litres
• Secondary expansion (post-expansion): 180 to 210%
• Heat conductivity: 0.036 W/mK
• Dimensional stability: 5% or less
• Skin formation time: 10 minutes or less
• Cutting time (3 cm strip test): 60 minutes or less
• Full cure time: 24 hours (at +23 °C and 50% relative
  humidity)
• Cured colour: pink
• Can and applicator temperature: +10 °C to +30 °C
  (optimum +20 °C)
• Ambient and substrate temperature: +10 °C to +30 °C
• Adheres to: brick, concrete, plaster, wood, metals,
  styrofoam, hard PVC, rigid PUR
• Does not adhere to: polyethylene, polypropylene,
  polyamide, silicone, Teflon
• Gap rules: door and window 10 to 30 mm with mechanical
  coupling; gaps over 30 mm filled bottom-to-top in zigzag; gaps over 50 mm not
  permitted
• UV resistance: cured foam is UV-sensitive, must be
  plastered or painted over after cure
• Shelf life: 12 months from manufacture, stored
  vertical (valve up) at +5 °C to +30 °C
• Cold transport: can be stored at -5 °C for no more
  than 7 days
• Compatible applicator: standard PU foam applicator gun
• Training: adequate PU training required from 24 August
  2023 (EU regulation)

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.