Polyurethane Foam Caulking Sound Insulation Waterproofing Spray Foam High Density Construction Product Description: B1 Fire Rated PU Foam is a one-component polyurethane foam designed for construction filling, sealing, and insulation. It features convenient application and good adhesion. Available in 750ml cans, with OEM/ODM and private label services for bulk orders. Key Selling Points: 1. B1 Fire Retardant Grade. 2. 750ml Aerosol Can. 3. One-Component Formula. 4. Good