19 NON-METALLIC TILES; BUILDING MATERIALS; NAMELY, WALL AND CEILING PANELS, STRUCTURAL BLOCKS, NON-METALLIC BEAMS, FIREPROOF CEMENT COATINGS, COATINGS USED AS BUILDING MATERIALS, NON-METALLIC RIGID PIPES FOR BUILDING, FACINGS AND FLASHINGS, AND NON-METALLIC MOULDINGS FOR BUILDING