... polystyrene XPS sandwich panel 1, light weight, high strength, 2, flat surface & high performance Heat insulation extruded polystyrene(XPS) sandwich panelsimple introduction ... roofing insulation, etc., and the insulation effect is more remarkable2,Exterior wall insulation:3,Insulation,heat insulation,waterproofing4,Ground floor insulation:5,Cold storage building insulation:6 ...