... powder of high natrul purity,they are light weight ,enviromental-protective.good for humanhealth SPECIFICATIONdrywall, Ceiling board, Drywall, Paper faced ... 5,12.7,13,15 and 15.9mmLinyi Weicheng Metal Products Co.,Ltd also produces drywall of high quality ,as they are ... convenient for construction, no harm to human being and environmental-protective, they have been world widely popular ,we have exported ...