The Bison Fire Rated B2 Construction Foam 750 ml is a low-expansion, high-performance foam ideal for filling joints, gaps, and cavities indoors or outdoors. It offers excellent insulation, bonds well to many surfaces, and is resistant to water and chemicals. CFC- and HCFC-free, it’s ozone-friendly and environmentally safe. Easy to use, simply shake, apply, and allow to expand and cure. Once hardened, it can be sawn, drilled, painted, or plastered.