SOPRA-XPS 40, 60 & 100 are rigid thermal insulation board made of extruded polystyrene close cell foam with shiplap or square edges on its four sides. The optimized formula of SOPRA-XPS 40, 60 & 100 contain no CFC, no HCFC and no HFC 134a. Moreover, this formula has zero ozone depletion potential and a very low global warming potential (less than 50).