... manufacture for PPGI,GI,corrugated steel sheet and EPS sandwich panels sincere 1993 with a great reputation. Both side metal specification: steel ... ,JIS &its equivalent the both metal meterialInner Material the sandwich panel thickness50,75,100,150,200mmVolume density 8-20kg/m3the ... industrial park,boxing county,shandong province in china Roofing/Wall Sandwich panels with more color choices--Factory