... 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 ... buildings, storages, exhibition halls, gymnasiums ,etc Heat insulation and fireproof rock wool sandwich panel