The purpose of this Standard is to establish a nationally recognized standard for plumbing fixtures of non-vitreous ceramic, including fixtures containing components of other recognized materials, for the guidance of manufacturers, distributors, and purchasers to promote better understanding between suppliers and users; and to furnish a basis for fair competition in furnishing such plumbing fixtures to meet the principal demands of trade. This standard covers physical requirements and test methods pertaining to material, grading, dimensions, certain features of construction, and types and sizes of plumbing fixtures of nonvitreous ceramic currently in general use and demand. Also given are definitions inspection methods, and tests which establish generally acceptable quality standards. Fixtures included in this standard are water-closet tanks, lavatories, urinals without integral trap, bidets, bathtubs, shower receptors, kitchen and bar sinks, service sinks, and drinking fountains. The values stated in U.S. Customary units are to be regarded as the standard.