Roofing/wall sandwich panels 1.nice water-proof character 2.easily ... manufacture for PPGI,GI,corrugated steel sheet and EPS sandwich panels sincere 1993 with a great reputation. Both side ... &its equivalent the both metal meterialInner Material the sandwich panel thickness50,75,100,150,200mmVolume density 8- ... county,shandong province in china Roofing/Wall Sandwich panels with more color choices--Factory