denture base material (typeⅠ) , also named heat-curing denture base material, consist of two parts，powder and liquid. the main composition of powder and liquid are poly(methyl methacrylate) and methyl methacrylate respectively, and the powder is synthesized by suspension polymerization. little polymerized shrinkage, no residual monomer after polymerization、excellence fracture and impact toughness and good adhesion to synthetic resin teeth are their main advantage. main usage: only for denture bases making； standard packing: 100g/bottle, 100ml/bottle; 500g/bottle, 500ml/bottle. popular shade：0#～3#，any other shade are available. expiry date: powder，three year；liquid，two year.