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