... bottom is groove. 3.Waterproof, 4fire retarding,wearing pvc piping1)Fetures:wearing resistance,waterproof,flame retarding,aging resistance, ... 7.5mm,8.5mm,9.0mm5)PVC%:40%,45%,50%6)Surface: common glossy, high glossy, matt colors, transfer printed, laminated ... colors, and the colors can be supply by customers and made by us. pvc ceiling panel ...