... construction Description:Light weight energy-saving EPS Sandwich wall PanelComposition: Calcium silicate board (face panel) + Cement and EPS (core) ... T9978Water tightness to ASTM C1185No droplets observed behind the panel,Test 24 hours at 250mm water headPartition stiffness ... weight,waterproof,soundproof,heat insulation eps sandwich panel 2013* light weight,waterproof,soundproof,heat insulation eps ...