IsoSpray 05C031 is a low viscosity; two component; rigid open cell polyurethane spray-foam system designed for insulating wall foam applications. It was designed to meet a Class I ASTM E84 flame rating and is easily processed by most commercially available; airless; two component; heat controlled; urethane spray equipment. This system was formulated to include an anti-microbial agent; and yields excellent coverage with a very smooth foam surface.