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3M IC15WB+, 10.1 ounce, yellow, intumescent firestop will maintain a firestop penetration seal for up to 3 hours. IC15WB+ is used typically in mechanical, electrical and plumbing applications to firestop openings created in fire rated floors, ceilings, walls, metallic and plastic pipes, communication cable, cable trays, insulated pipe and hvac duct penetrations.