The gypsum board is made of building gypsum as the main raw material, with the appropriate amount of additives and fibers as the core, and the special board paper as the protective surface. The gypsum board has the characteristics of light weight, sound insulation, heat insulation, strong processing performance and simple construction method. Screw Barrel Accessory,Injection Screw Accessories,Screw Barrel Attachments,Single Screw Spare Parts Zhejiang Zhongsu Screw Co., Ltd. , https://www.zhongsuscrew.com