Metal roofing wall sandwich panels 1.nice water-proof ... co.,ltd ,a professional manufacture for PPGI,GI,corrugated steel sheet and EPS sandwich panels sincere 1993 with ... order50tonstandardGB/T,ASTM,JIS &its equivalent the both metal meterialInner Material the sandwich panel thickness50,75,100,150 ... industrial park,boxing county,shandong province in china Metal roofing/wall sandwich panels--Factory