... steel and injected the expanded polystyrene in middle. 1)Item:EPS Sandwich Panel2)Model:965(for Roof)3)Crest height:40mm4 ... )Thickness for EPS: 50mm,75mm,100mm5)Thickness for steel sheet: 0.3mm-0 ... we can do according to your request7)Length tolerance: +/-5mm8)EPS density: 8-24kg/m39)Character: Light in weight, heat insulation ...