Gun Grade B2 Expanding Fire Foam everbuild

Gun Grade B2 Expanding Fire Foam

High performance Polyurethane foam

Product Description

EVERBUILD FIREFOAM B2 HANDHELD is a quick setting one part polyurethane foam with fire resistance properties. The foam expands on application to up to 50 times its original volume and meets the requirements of DIN 4102 Part 1 for Construction Materials and BS476 Part 20. Fire rated up to 2 hours in certain joint configurations. Copies of the independent test certificate, Warrington fire report number 160902 are available on request.

Once cured, the foam can be cut, sawn or plastered over after only one hour providing the working temperatures (can and surfaces) are between +5 to +25oC, ideally 20oC.



·      High degree of fire rating: slows down the passage of flames and smoke in comparison to standard B3 grades

·      Quick setting - can be cut, sawn or plastered in 1 hour.

·      Economical in use - expands up to 50 times its original volume.

·      Fills irregular and broad gaps where most conventional fillers would fail.

·      Possesses insulating and sound deadening properties.

Code Product Boxed In
080090 Gun Grade Expanding Fire Foam B2 12

Areas for Use


n  gaps around pipe entries through fire rated walls

n  To provide a fire rated seal around window and door frames

n  Electrical wire chasing prior to plastering, where a fire rating is required.

n  deep joints prior to applying sealant or plaster

n  irregular gaps in stone, brick, concrete or plaster



n  door frames

n  timber structures

n  Windowsills and thresholds.

n  Window frames



n  Behind cladding to exterior walls.

n  behind soffit and barge boards

n  In automotive applications.


When used as part of a fire rated joint, use in conjunction with EVERFLEX FIREMATE intumescent sealant for maximum fire rating.




·       Carefully read instructions and text in warning box before use.

·       Not suitable for use with P35 gun. Use P20 or P65.

·       Do not over pressurize container.

·       Always apply above 5oC.

·       Clean spills immediately with EVERFLEX FOAM CLEANER.



Surface Preparation

Ensure all surfaces are clean, sound and free from dust and loose particles. Moisten surfaces to be sealed with water. This assists the curing process.





Shake can well before use (about 20 times).

Carefully fix nozzle. Do not overtighten or force.


Only partially fill cavities, as the foam will expand to fill the remaining space. Any excess foam can be removed whilst still wet with EVERFLEX FOAM CLEANER. Cured foam must be removed mechanically. Always remove nozzle from can and clean immediately after use with EVERFLEX FOAM CLEANER. When used for fixing doorframes, supports must be used until the foam is fully cured.  


Please note:

When transported in cars, keep in boot, out of direct sunlight.

When removing cured foam from skin, take care not to damage with abrasives.

Grease skin with body lotion or similar.


IMPORTANT – Re-use is only possible by cleaning the nozzle and valve tip with EVERBUILD DUAL PURPOSE FOAM CLEANER before the foam has cured. Do not push any object into the valve as the contents may explode.



Specific Data


37 litres (750ml can)

Cell Structure

Medium fine

Tack Free

Approx. 8 minutes


20 mins to 1 hour depending on bead dimensions.

Full Load Bearing Stability

App, 12 hours (20mm bead)

Working Temps

5oC - 25oC. (Optimum 20oC)

Tensile Strength

18N/cm2 (DIN 53455)

Elongation At Tension

30% (DIN 53455)

Shear Strength

8N/cm2 (DIN 53422))

Flexural Strength

20N/cm2 (DIN 53423)

Compressive Strength

5N/cm2 (DIN 53421) at 10% stress.

Water Absorption

0.3 Vol % (DIN 53428)

Thermal Conductivity

0.04 W/Mk (DIN 52612)

Temp Res Of Cured Bead

Long Term:            -40 - +100oC

Short Term:           -40 - +130oC

Building Material Class

B2 (DIN 4102, Part 1).

Health & Safety

Consult MSDS for full list of hazards




Store upright between 20 and 25oC Pressurized container. Protect from sunlight and do not expose to temperatures above 50oC. Do not pierce or burn the can even after use.  Store as flammable liquid.

Note: Elevated temperatures will reduce shelf life dramatically.



Shelf Life

12 months in original containers at stated storage temperatures.

File Download
Fire foam B2 handheld and gun grade.pdf