Study on the Fire Risk of Blowing Agents during Spray-Type Polyurethane Foam Construction

Abstract

This study investigates the risk of fire explosion caused by the presence of combustible gas in the propellant of spray-type polyurethane foam and the ammonia gas generated during the curing of polyurethane foam. Analysis of domestic fire cases confirmed that when construction work using polyurethane foam spray and fire handling were conducted simultaneously, fire accidents repeatedly occurred because the welding sparks acted as an ignition source on the surface of the polyurethane foam. Experiments confirmed the possibility of fire explosion owing to the presence of flammable substances in the polyurethane foam and the combustible gas in the propellant. The production of ammonia gas increased during the polyurethane-foam-curing stage, and B3 was more dangerous than B1.