The effect and requirements of each layer of the surface are different, and the mortar used for each layer is different. At the same time, the characteristics of the base material and the engineering parts are different, and the technical requirements of the mortar are different. This is also the main basis for selecting the type of mortar. Cement mortar should be used for parts with high humidity or high strength; mixed mortar is mostly used for indoor bottom or middle or surface plastering; lime mortar, hemp ash and paper ash are mostly used for indoor middle or surface plastering. Cement and lime mixed mortar is used for the concrete base. For the base and the surface of the slats, fiber materials are used to increase the tensile strength to prevent cracking. Steel Door,Security Door,Big size Security door Shengyi Door Co., Ltd. , http://www.china-security-door.com