... usable area Sound Insulation,Fireproof Earthquake Resistance waterproof 1. The introduction of easy installing sandwich panel Wonke ... , thin, water & fire proof, heat preservation, sound insulation, quakeproof, low cost and space-saving. EPS & Cement ... 00 3. The technical reference of the easy installing sandwich panelItemsUnits120mm100mm75mm50mmVolume weightKg/m3750-800Anti-bending damage load ...