Prosource FireBlock B2 Fire-Stopping Polyurethane (PU) High-Expansion Orange Spray Foam Sealant

Prosource FireBlock Fire-Resistant Foam Sealant is a high-yield, B2 fire-rated polyurethane foam formulated for exceptional sealing, filling, and fire protection performance. Its fire-resistant design helps prevent the passage of flames, heat, smoke, and gases, providing robust passive fire protection in approved applications. The orange foam forms a durable, airtight, and water-resistant bond while also offering excellent thermal and acoustical insulation properties. Available in both gun-type and straw-type dispensers for application control.

PRODUCT FEATURES

• Processing temperature (can environment): 41°F to 95°F
• Optimal processing temperature: 64°F to 77°F
• Temperature resistance (cured foam): -22°F to 176°F
• Bonds to most construction materials, including concrete, masonry, metal, wood, and plastic (will not bond to teflon or silicone)
• Certified B1 fire rating; slows the passage of flames, heat, smoke, and gases
• Provides up to 4 hours of fire resistance in approved applications

USES

• Seal concealed penetrations from floor to floor or room to room to block the spread of fire, heat, smoke, and gases
• Apply seals around windows, doors, siding, and baseboards
• Fill cracks, joints, and gaps around pipes, vents, utility lines, and electrical outlets
• Block drafts and moisture around attic hatches and crawl spaces
• Seal and insulate gaps between sole plates and concrete slabs

DIRECTIONS

1. Wear protective gloves, goggles, and work clothes during use
2. Clean surfaces of dirt, grease, and dust, then lightly moisten the cavity
3. Use only when ambient and can temperatures are between 41°F and 104°F
4. Shake the can for 2 minutes before use
5. Remove the cap and screw the gun or applicator onto the can
6. Hold the can upside down with the tube aimed at the far end of the cavity, then slowly press the trigger to dispense foam; test on a scrap surface before application
7. Fill the cavity approximately 40% to allow for expansion
8. Use Prosource Foam Cleaner to remove excess uncured foam from the nozzle and valve
9. Foam becomes tack-free in approximately 20 minutes and fully cures in 24 hours
10. Once cured, foam can be trimmed, painted, sanded, plastered, grouted, or caulked