Do not expose urethane foam to open flames or any other direct or indirect high temperatures. Ignition sources such as burning operations, welding, burning cigarettes, space heaters, or naked lights.
Once ignited, urethane foam will burn rapidly releasing great heat and consuming oxygen at a fast rate. In an enclosed space the resulting deficiency of oxygen will present a danger of suffocation to the occupants. Hazardous gases released by the burning foam can be incapacitating of fatal if inhaled in sufficient quantities.