Ideal 31601 Duct Seal Compound, 1 lb, Dark Gray, 10/Carton

Duct Seal, Use as a fire stop around conduit and cable runs, Seals around junction boxes, flashings and service entrances, Permanently soft, non-toxic compound can be painted immediately after application, Won't adversely affect other plastic materials or corrode metals. - Ideal Duct Seal Compound, Container Size: 1 lb, Form: Solid, Dark-Gray, Composition: Crystalline Quartz Silica, Specific Gravity: 1.65, VOC: 17g/L, Density: 1.78g/cc, Applicable Materials: Metals, Wood, Plastics.