A quick-setting fire rated, gun grade one part polyurethane foam that expands on application to yield up to 50 times the can contents. Fire rated up to 4 hours in certain joint configurations. Quick setting – once cured the foam can be cut, sawn or plastered over after only one hour. Fills irregular and broad gaps where most conventional fillers would fail. Possesses insulating and sound deadening properties. Slows down the passage of flames and smoke. Meets the stringent requirements of DIN 4102 Part 1 for Construction Materials, Class B1 and BS 476 Part 20 For use with anEverbuild Professional Foam Gun. 750ml.