Fire Barrier Sealant, Application Method Caulk , Color Gray, Container Size 20 oz, Container Type , Fire Rating 4 hr, Firestop Type Sealant/Caulk, Flame Spread Index 1, Flame Spread Rating Class A, For Material Type All Common Construction Surfaces, For Use On Busways, Cable Trays, Ducts, Formulation Silicone, Resistance Properties Water , Shelf Life 18 mo, Smoke Developed Index 45