... ,75mm,100mm,120mm,150mm,170mm,200mm 5Core materialHigher fireproof rock wool 6External sideColorful PPGI corrugated steel sheet 7Internal sideFlat ... quality2)waterproof and Fireproof3) 3.The advantage of the rock wool sandwich wall panel:4)high strength5)Durable6)Heat ... and Most area-saving8) Environmental protection3. Features of the rock wool sandwich panel for the roofing:1) Energy-saving, ...