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