Nullifire FF197 is a high-performance, one-component polyurethane fire resistant foam designed for sealing linear joints and gaps in various building applications. This 750ml can provides up to 4 hours of fire resistance (E240, EI240), making it ideal for sealing around service penetrations, pipework, cables, and door and window frames to prevent the passage of fire and smoke. It offers excellent adhesion to most building materials and is easy to apply. The foam cures to a pink color and offers a sound reduction of 60 dB.