3M Fire Barrier CP 25WB+ Caulk is a premium elastomeric latex caulk designed for use as a one-part fire, smoke, noxious gas and water sealant. In addition, the unique intumescent property of this material (expands when heated) means that as cable or pipe insulation is consumed by fire, CP 25WB+ Caulk expands to maintain the penetration seal. When properly installed, this product provides up to 4-hour fire protection in tested and listed systems. Firestops items penetrating through fire-rated construction assemblies. Dries to red color, no mixing required.

CP 25WB+ Caulk features superior adhesion strength, caulk rate and no-sag application with expanded UL Classified fire protection systems plus a halogen-free formula.

3M Fire Barrier CP 25WB+ Caulk can be installed with a standard caulking gun, pneumatic pumping equipment or it can be easily applied with a putty knife or trowel. CP 25WB+ Caulk will bond to concrete, metals, wood, plastic and cable jacketing. No mixing is required. Size: 10.1 ounce Water Base: Easy clean up, no special handling, routine disposal. Intumescent: Expands when heated to seal around items consumed by fire. Endothermic: Absorbs heat energy, releases chemically bound water. Thixotropic: Will not sag or run in overhead or vertical applications. Halogen-free. Fast dry: Tack-free in approximately 10-15 minutes. Paintable. (Best results obtained after 72 hour cure.) Minimal shrinkage. Water seal: Seals against inadvertant water spills in the unexpanded state. High caulk rate: 1000 g/min. with in. nozzle. Point contact allowed. Continuous Operating Temperature not to exceed 120F (48C) Applications:
Use to seal construction openings, blank openings and penetrating items against the passage of flame, noxious gas, smoke and water. Restores fire rated construction to original integrity. Also for use with 3M Brand Fire Barrier Penetrating Sealing Systems 7902 and 7904, FS195+ Wrap/Strip an