... protective.,passed ISO 9001 SPECIFICATIONGypsum board, Ceiling board, Drywall, Paper faced Gypsum board, Building materiala).Main material: gypsumb).for ceiling suspensiond).Normal specification: 595* ... of gypsum powder of high natural purity mixed with glass fiber ,starch, then paper-faced, because their light weight ,convenient ... America ,Europe and Asia, so many countries in the world ceiling board