Everbuild-Fire-Foam-B1-Handheld-Aerosol-Everbuild-EVFIRE-p-Firefoam-B1-Handheld-is-a-quick-setting-fire-rated-one-part-polyurethane-foam-It-expands-on-application-to-yield-up-to-50-times-the-can-contents-and-meets-the-extremely-stringent-requirements-of-the-test-criteria-BS476-Part-20-Class-B1-Fire-rated-up-to-4-hours-in-certain-joint-configurations-Once-cured-the-foam-can-be-cut-sawn-or-plastered-over-after-approximately-one-hour-p-Everbuild-EVFIRE-Fire-Foam-B1-Handheld-Aerosol-750