Everbuild B1 Fire Foam

Everbuild B1 Gun-Grade Fire Foam Everbuild B1 Gun-Grade Fire Foam is a fast-setting, fire-rated, one-part polyurethane foam with exceptional fire resistance. It expands to up to 50× its original can volume and meets the rigorous standards of DIN 4102 Part 1 Class B1 and BS 476 Part 20 , achieving fire ratings of up to 4 hours in certain joint configurations. Once cured, it can be cut, sawn, or plastered after just one hour, making it ideal for both construction and renovation applications.