Abrasion or corrosion resistant pipe lining systems of concrete or stone;
building materials (non-metallic) for use in industrial plants;
non-metallic rigid pipes (not of metal, elastomer, plastic or rubber);
concrete pipes, conduits, ducts, hoses for piping concrete, piping systems, pipe fittings, pipe accessories, casings, collars, manifolds, couplings, coatings, cementitious and bituminous seals, flanges, sleeves, insulation (being non- metallic building materials), and pipelines