We formulated this fire sealant to dry and form a monolithic firestop seal that also acts as a barrier to airborne sound transmission. 3M™ Fire Barrier Sealant CP 25WB+ is a red, one-component, gun-grade, latex-based, intumescent firestop sealant. This fire barrier sealant helps control the spread of fire, smoke and noxious gases before, during and after exposure to a fire.

• Firestop tested for through penetration applications up to 4 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC S115
• Applied with conventional caulking equipment with excellent caulk rate
• Sag-resistant properties offer clean application as well as strong adhesion
• Water-based and paintable sealant provides easy application and clean-up
• Sealant is re-enterable and repairable
• Fire resistance tested for static construction joint systems in accordance with ASTM E 1966 (UL 2079)
• Sealant helps minimize sound transfer