Expands when heated to seal around items consumed by fire

Dependable and Easy-to-Use Firestop Sealant
Tough and ready-to-use, 3M™ Fire Barrier Sealant CP 25WB+ is a high-performance, one-component, latex-based, intumescent sealant that dries to form a monolithic firestop seal. This sealant also acts as a barrier to airborne sound transmission. As penetrants are exposed to fire, the unique intumescent property of this material allows 3M™ Fire Barrier Sealant CP 25WB+ to expand and help maintain a firestop penetration seal for up to 4 hours. This sealant is designed to help control the spread of fire, smoke and noxious gases before, during and after exposure to a fire when installed in accordance with a listed through-penetration or fire-resistive joint assembly system (STC-Rating of 54 when tested in a STC 54-rated wall assembly).

Ready to Protect for Consistent Results
3M™ Fire Barrier Sealant CP 25WB+ firestops blank openings and penetrations passing through fire-rated floor, floor/ceiling or wall assemblies and other fire-rated interior building construction. This halogen-free sealant is capable of expanding a minimum of 3 times its dried volume when exposed to temperatures above 1000°F (538°C). We engineered this sag-resistant sealant to exhibit strong adhesion to a full range of construction substrates and penetrants. Applied with conventional caulking equipment, this gun-grade sealant offers an excellent caulk rate, no mixing is required. In addition, this water-based sealant is paintable as well as re-enterable and repairable, offering easy application and clean-up.

Superior adhesion — bonds to concrete, metals, wood, plastic and cable jacketing

Recommended Applications

• HVAC ducts and vents
• Metallic and non-metallic pipes
• Blank openings
• Single and bundled cables
• Insulated pipe
• Pipe and cable through-penetrations
• Busways
• Combos
• Rated wall, floor and floor-ceiling assemblies
• Static construction joints

Learn more about 3M™ Fire Barrier Sealant CP 25WB+ and other fire protection products (PDF, 3.55 Mb)

Reliable and Affordable Fire Protection
Effective and easy to install, 3M™ Fire Barrier Sealant CP 25WB+ is part of our family of fire protection products that offer the broadest, long-lasting solutions for a variety of commercial, industrial and residential applications. As a trusted leader in the fire protection industry, 3M offers a broad line of affordable products designed to meet the most demanding firestop requirements. Find the solution you need from the industry-preferred line of fire protection products.