... steel coil/sheet ( material roofing sheet), corrugated iron sheet, sandwich panel, C/Z section steel sincere 1993 with a great reputation ... . Has our own GI, PPGI, corrugated iron sheet, sandwich panel, C/Z section steel production line. As regard to the ... rockwoolThickness: 030-0.60mmColor: according to RAL numberInner materialthe sandwich panel thickness:50,75,100,150,200mmC/Z section steel Matching ...