Shop

SAX Fireblock Expanding Foam is a B1-rated, fire-resistant, and smoke-blocking single-component polyurethane foam. It forms a semi-rigid yet flexible seal that helps accommodate joint movement and vibration, making it suitable for sealing mechanical penetrations, filling voids, and blocking smoke and air leakage in indoor and outdoor applications.

Features

• B1-rated fire-resistant expanding foam
• Helps prevent the spread of smoke and fire through gaps, cracks, and service penetrations for up to 4 hours
• Single-component polyurethane foam formula
• Creates a semi-rigid but flexible seal
• Waterproof once cured
• Paintable and sandable after curing
• Provides excellent sound and thermal insulation
• Adheres to wood, metal, concrete, drywall, brick, and stone

Specifications