Classification Information
Non-metallic building materials; machined parts of ceramic for building purposes; mortar for ridge tiles and angle ridges, plane glass tiles, round timber for snow-guard systems, air bricks; clay roofing tiles; skylights for access to the roof, snow guard systems, non-metallic shingle, snow guards, plastic passage tiles; non-metallic rigid drain pipes; all these products not metallic
Nonmetallic Building Materials