... 2. Light weight, heat insulation 3. Installation is easy Rockwool wall sandwich panel:Steel Thickness: 0.35~0.6 mmPanel thickness: 50/75 ... ) upper layer is steel sheet,(2) the inner layer is rock wool sandwich,(3) the bottom layer is also steel sheetRockwool density: 120 ... buildings, storages, exhibition halls, gymnasiums ,etc Heat insulation and fireproof rock wool sandwich panel