Firefoam B2 Gungrade is a quick setting fire rated, one-part polyurethane foam designed for application by any standard foam applicator gun. High degree of fire rating: slows down the passage of flames and smoke in comparison to standard B3 grades Fire resistant for up to 2 hours in certain joint configurations Quick setting – can be cut, sawn or plastered in 1 hour Expands up to 50 times original can volume Possesses insulating and sound deadening properties Meets the requirements of the test criteria for BS476 Part 20 When used as part of a fire-rated joint, use in conjunction with Everbuild Fire intumescent sealant for maximum fire rating