Product Description
3M™ Fire Barrier Watertight Spray is a sprayable, moisture‑curing, hybrid siliconized polymer that creates a tough, elastomeric seal. Designed for interior construction voids and joints—including curtain-wall perimeter gaps—it controls fire, smoke, water, and sound transfer.
Key Benefits
- Water-Tight Seal: Meets UL Water Leakage W‑Rating standards in tested systems.
- Fire Protection: Provides up to 3-hour fire resistance in construction joints (ASTM E1966/UL 2079).
- Washout Resistant: Survives 24-hour water exposure after 2-hour cure (ASTM D6904).
- Sound Control: STC-rated to minimize airborne noise transmission.
- Wide Adhesion: Bonds effectively to concrete, gypsum, metal, plastic, wood, and insulation.
Best For
- Construction and curtain-wall joints
- Interior voids requiring fire, smoke, or water containment
- Sealing around pipes, ducts, and cables
- Applications needing combined fire and water protection
- Locations vulnerable to washout during construction
- Sound-dampening in wall assemblies
Product Properties
| Property | Specification |
|---|---|
| Form | Moisture-curing, hybrid siliconized polymer (sprayable) |
| Fire Resistance | Up to 3 hours per ASTM E1966 / UL 2079 in construction joints |
| Water Tightness | UL Water Leakage W‑Rating, Class I |
| Washout Resistance | Meets ASTM D6904 after 2 hr cure |
| Sound Rating | STC-rated performance |
| Compatible Substrates | Concrete, metal, plastic, wood, gypsum, insulation |
| Packaging | 5-gallon (18.9 L) pail |
