3M fire block foam FB-foam is a fire block and draft stop used to help seal, fill, insulate and bond for non-rated residential and commercial construction. This foam-in-place fire block is heat-resistant (up to 240°F/115°C) and meets ASTM E 84 (mod) class 1 for smoke spread and flame development. This fire block foam is ready-to-use and tack-free in approximately 5-minutes.

• Tested as a type V residential fire block to ASTM E 84 (modified)
• Durable foam is heat-resistant
• Acts as a draft stop to help reduce air infiltration
• Thermal insulator foam offers an R-value of 4 in. - 5 in. (25.4 mm) typical
• Fire block foam is ready-to-use (no mixing required)
• Tack-free in approximately 5-minutes
• Expands up to 200% in volume to quickly and effectively seal openings
• Meets International Building Code (IBC) and International Residential Code (IRC) fire blocking requirements
• Features minimal shrinkage and sag-resistant formulation to help ensure longevity
• Excellent adhesion that bonds to concrete, brick, metals, wood, plastic and cable jacketing