great stuff, 12 oz, fire block smart dispenser insulating foam sealant, helps impede the spread of fire & smoke through service penetrations, such as pipes, cables & ducts, tested according to astm e84, astm e814 ul1715/ recognized as an alternative fire blocking material, bright orange colored foam for visual inspection, fills, seals & insulates gaps up to 3/4" with an airtight, water resistant bond.