Standard Specification for Discrete Non-Asbestos Fiber-Cement Interior Substrate Sheets

This standard covers dimensionally stable discrete non-asbestos fiber-cement interior substrate sheets suitable for decoration as paint, wallpaper, natural stone, tile, or resilient flooring in internal wet and dry areas. The list of materials for this specification does not include asbestos-cement flat sheets, non-asbestos fiber-cement flat sheets used for claddings, facades, curtain walls, and soffits, gypsum backing boards and coreboards, water-resistant gypsum backing boards, glass mat gypsum backing boards, fiber mat cement boards, or cement-bonded particleboards. The sheets may be coated or uncoated and are classified into four grades according to flexural strength. Materials should essentially consist of an inorganic binder or a calcium silicate binder and optional compatible process aids, fillers, and pigments. To meet property requirements, the products may be formed with or without pressure and cured under natural or accelerated conditions. All products should conform to the required values of flexural strength, density, and modulus of elasticity, and to the qualities of workmanship, finish, and appearance.