A material applied over spray polyurethane foam (and other foam plastics) designed to slow the temperature rise of the foam during a fire situation and delay its involvement in the fire. With few exceptions, building codes require that SPF be separated from interior spaces with a thermal barrier. Building codes require that thermal barriers for use with polyurethane foam: (1) limit the average temperature rise of the unexposed foam surface to no more than 139°C (250°F) after 15 minutes of fire exposure complying with ASTM E 119 or UL 263 standard time-temperature curve; and (2) will remain in place for 15 minutes based on a small room corner test.