3M™ Fire Barrier Sealant CP 25WB+ is a 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 intumescent property of this material allows the sealant 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). 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.

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

Container Size (Metric): 18.9 Liter

Container Size (Imperial): 5 Gal. (US)

Product Type: Sealant

Fire Rating: Up to 4 hours

Firestop tested for through penetration applications up to 4 hours in accordance with ASTM E814 (UL 1479) and CAN/ULC-S115

Sag-resistant properties offer clean application as well as strong adhesion in both wall and floor applications

Water-based and paintable sealant provides easy application and clean-up