Classification Information
Aquarium sand; Bituminous coatings for roofing; Non-luminous and non-mechanical signs, not of metal; Non-metal mosaic tiles for building; Refractory construction materials, not of metal; Sealer coatings sold as an integral component of non-metal tiles, natural stone, and molded resins for construction purposes; Water-pipes, not of metal; Wood blocks; Works of art of stone, concrete or marble
Nonmetallic Building Materials