Fischer 1K Rapid Installation Foam is a light‑yellow polyurethane spray foam supplied in a 750 ml can. It expands to a density of 20–30 kg/m³, achieves tack‑free condition in about 20 minutes and can be cut after roughly 60 minutes at 23 °C, and carries a fire rating of B3 (DIN 4102‑1). The cured foam provides a compressive stress of 4.5 N/cm² and a thermal conductivity between 0.030 and 0.035 W/mK.
