The new Hilti CP 620 Fire Foam allows the installer to access through penetrations, cable trays, cable bundles, cable runs and multiple penetrations with combustible and non-combustible pipes. Hilti CP 620 Fire Foam must be used in conjunction with Hilti CP 645 warp strip for combustible pipes. It is resistant to water, bacteria and gas. The foam expands up to seven times its size (unrestricted) within seconds and completely cures in one minute or less. This one-step process does not require additional firestop coatings or mineral-wool backfills and allows the contractor to access difficult areas easily. CP 620 Fire Foam is UL classified and FM approved, and it has been blast tested.Hilti.