3M™ Fire Barrier Sealant CP 25WB+ – Red, 20 fl oz Sausage Pack

Protect your fire-rated penetrations with one of the industry's most trusted intumescent firestop sealants. 3M™ Fire Barrier Sealant CP 25WB+ is a professional-grade, one-component sealant engineered to help prevent the spread of fire, smoke, and toxic gases while maintaining the integrity of fire-rated walls, floors, and joint systems for up to 4 hours in tested applications.

Formulated with advanced intumescent technology, this latex-based sealant expands up to three times its original volume when exposed to extreme heat, helping seal openings created as combustible materials burn away. Its sag-resistant consistency delivers clean, precise application on both vertical and horizontal surfaces, while the water-based formula allows for easy installation, cleanup, and painting after curing.

Ideal for commercial, industrial, and institutional construction, 3M™ Fire Barrier Sealant CP 25WB+ bonds securely to concrete, metal, wood, plastic, cable jacketing, and many other common construction materials. Its re-enterable and repairable design simplifies future maintenance, making it the preferred choice for contractors who require dependable firestop performance and long-term reliability.

Key Benefits

• Up to 4-hour fire protection in tested through-penetration systems
• Advanced intumescent formula expands up to 3× when exposed to fire
• Helps block fire, smoke, and toxic gases
• Strong adhesion to concrete, metal, wood, plastic, and cable jacketing
• Sag-resistant for clean application on walls and floors
• Water-based formula for easy application and cleanup
• Paintable after curing
• Re-enterable and repairable for future modifications
• Helps reduce airborne sound transmission (STC Rating up to 54)
• Ideal for commercial, industrial, and residential firestop applications

Recommended Applications

• Metallic and non-metallic pipe penetrations
• HVAC ducts and vents
• Single and bundled cable penetrations
• Insulated piping
• Busways
• Blank openings
• Fire-rated walls, floors, and floor-ceiling assemblies
• Static construction joints
• Mechanical, electrical, and plumbing (MEP) firestop systems