3M Fire Barrier Sealant 10.1 oz. is a high-performance, water-based intumescent sealant designed to protect openings in floors and walls from fire, heat, smoke and toxic gases. Its easy-to-use cartridge formulation expands when exposed to high temperatures, sealing voids and combustible materials to maintain the integrity of fire-rated assemblies. Ideal for commercial and residential firestop applications, this sealant delivers up to 4 hours of fire protection while offering fast drying, excellent adhesion and a paintable surface finish.

Whether you’re sealing around pipes, cables or ductwork, 3M Fire Barrier Sealant combines ease of application with proven fire-resistance performance to help meet building and life-safety codes.

Key Features

• Water-based, latex formula for easy cleanup and no special disposal
• Intumescent action expands under heat to seal gaps and fire-consumed materials
• Provides up to 4 hours of fire resistance
• Fast dry—tack-free in 10–15 minutes
• Paintable with minimal shrinkage after a full 72-hour cure
• No-sag, non-halogen formula with excellent adhesion
• Blocks smoke and toxic gas migration while remaining waterproof

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.