ICC-ES (International Code Council Evaluation Service) requires EPS boards used in building construction meet ASTM C578 requirements. One of these requirements is that the limiting oxygen index of EPS as measured by ASTM D2863 be greater than 24 volume %. Typical EPS has an oxygen index of around 18 volume %; thus, a flame retardant is added to styrene or polystyrene during the formation of EPS.
ICC-ES (International Code Council Evaluation Service) requires EPS boards used in building construction meet ASTM C578 requirements One of these requirements is that the limiting oxygen index of EPS as measured by ASTM D2863 be greater than 24 volume % Typical EPS has an oxygen index of around 18 volume %; thus a flame retardant is added to styrene or polystyrene during the formation of EPS