... ,100mm,120mm,150mm,170mm,200mm 5Core materialHigher fireproof rock wool 6External sideColorful PPGI corrugated steel sheet 7Internal sideFlat color ... for long distance transportation. 2. Advantages of the rock wool sandwich wall panel:1)lower price and best quality2) ... Most area-saving8) Environmental protection3. Features of the rock wool sandwich panel for the roofing:1) Energy-saving, lightweight, ...