EVERBUILD® B2 Gun Grade Fire Foam is a quick-setting one-part polyurethane foam with fire resistance properties. The foam expands on application 1.5 - 2 times its original volume. Once cured, the foam can be cut, sawn or plastered over after only one hour providing the working temperatures (can and surfaces) are between +5 °C to +25 °C, ideally 20 °C.