... are of aluminum or steel. Product: Polyurethane(PU) Sandwich Panel.Model: 970Crest height for Roof: 40mmThickness for PU: 30mm-100mmThickness for steel sheet: 0 ... requestLength tolerance: +/-5mmPU density: 30-42kg/m3Character: Light in weight, heat insulation, water resistant, green and environmentalApplication: Warehouse, gymnasium, exhibition halls, storage ...