This standard covers requirements and test methods for performance pertaining to water resistance, colorfastness, stain resistance, cleanability, and other significant properties, in addition to general requirements of materials and workmanship, finish and installation of plastic bathtub liners. While this standard covers the performance requirements of plastic bathtubs liners and describes these performance requirements in terms of methods of test applicable to all such units, a number of different materials and methods of manufacture may be used to meet these requirements. Portions of the standard are broken into separate requirements designed to identify individual characteristics. The plastic bathtub liner is commonly used as a custom installed retrofit insert or cover replacement to existing enamelized cast iron or steel bathtubs. The material and equipment which are listed as having been used to conduct the testing procedures in this standard are provided solely for informational reference. Materials and equipment of similar design, composition and specification may also be used to conduct these testing procedures.