... Guanhong.Materials: Hot Galvanised SteelPU: Fireproof, hot & sound insulation, waterproofWorking life: More than 20 years.Specification:NAMEPU Sandwich Panel ... in ultraviolet radiation, moisture, salt, heat and cold insulation for long time. Our PU sandwich panel can ... & sound insulation, anti water and fire resistant. anti UV, keep good condition for long time, easy installation Rock wool choi steel