A high performance, polyurethane expanding foam, fire rated and tested to BSEN 1366-4. Seals irregular gaps and expands over 40 times its can volume. This foam can be used at temperatures from +5°C to +25°C. The cured foam is semi-rigid and predominantly close-celled. It is resistant to temperatures ranging from -40°C to +100°C and to ageing, but not to UV-rays. Noise and heat insulation values are excellent. This is the straw aerosol version. Also available in gun grade (546609)