Waterproof backing board is a waterproof material specifically used in construction and decoration projects, made of high molecular weight polymers. Its main function is to form a strong waterproof barrier on the surface of the building, effectively preventing moisture from penetrating into the walls, floors, or other building structures, thereby protecting the building from moisture erosion. It is mainly suitable for indoor decoration, bathrooms, kitchens, basements and other scenarios, providing excellent waterproof performance, physical strength and construction convenience for buildings, and extending their service life.