17 Non-metallic flexible pipes, tubes, hoses, and fittings therefor, namely, valves of rubber or vulcanized fiber; non-metal seals for use in plumbing pipe connections; sealants for buildings; fillers for expansion joints; insulating materials; insulating articles, namely, building insulation; semi-processed materials, not adapted for a specific use, namely, recycled polyesters in pellet form for use in further manufacture, mineral fibres, namely, asbestos fibers, elastomers for bonding to articles used for shot-blasting, cellulose acetate, fibres impregnated with artificial resins for insulation, synthetic and composite materials, namely, carbon fibres not for textile use, semi-processed cellulose acetate, glass fibres and glass wool for insulation, cast nylon being plastic sheets for use in manufacturing displays, signs and packaging, chemical fibres in the form of thread and yarn, not for textile use, microporous synthetic plastic films being semi-finished products for manufacturing protective clothing, protective work clothing, and waterproof clothing, and for use in further manufacture, microporous synthetic plastic strips being semi-finished products for manufacturing protective clothing, self-lubricating cast polyamides in the form of pellets and films for use in manufacture, synthetic plastic fibres, other than for textile use, viscose sheets, for packing, cushioning or stuffing purposes, viscose panels being semi-finished goods for packing, cushioning or stuffing purposes, and ceramic-fibre yarns other than for textile use, namely, for use as insulation in buildings; semi-processed synthetic resin; clutch lining being semi-processed friction materials for clutch facings; semi-processed brake lining materials