3M Fire Barrier Sealant CP 25WB+, 10.1 fl oz

3M™ Fire Barrier Sealant CP 25WB+ is a premium firestop solution trusted by modular builders to meet the most demanding fire protection standards. This high-performance, water-based intumescent sealant is designed to seal through-penetrations and construction joints against fire, smoke, and toxic gases.

Formulated for easy application and clean-up, CP 25WB+ delivers up to 4-hour fire ratings per ASTM E814 (UL 1479) and ASTM E1966 (UL 2079) when properly installed. Its elastomeric, non-sagging properties ensure flexibility and a long-lasting seal — critical for modular buildings where transport vibration and slight movement are common.

Key Features:
- Up to 4 hours of fire protection for penetrations and joints
- Excellent adhesion to common modular construction materials (gypsum, steel, concrete, plastics)
-  Water-based formula — easy to apply, clean with water before curing
- Intumescent — expands when exposed to heat to maintain fire barrier
- Paintable once cured for seamless wall finishes
- UL Listed and Meets International Building Code (IBC) requirements
- Ideal for pipes, cables, metal ducts, and other modular penetrations

Typical Applications:

• Firestopping plumbing and electrical penetrations

• Sealing modular unit-to-unit joints and service cores

• Protecting walls, floors, and ceiling assemblies in modular and prefab construction

• Enhancing fire compartmentalization for code compliance
  
  

Technical Specs:

• Color: Red

• Cartridge Size: 10.1 fl oz (300 mL)

• Cure Time: Tack-free in ~30 minutes; full cure ~3–7 days depending on conditions

• Movement Capability: ±19% (per ASTM C920)

• Dries to red colour, no mixing required