17 Semi-finished products made of plastic material, in particular made of fiber-reinforced plastic material, namely, synthetic plastic and synthetic resins in the form of sheets, rods, foils, foams, bars, blocks and tubes; fireproof semi-finished products made of plastic material, in particular made of fiber-reinforced plastic material, namely, synthetic plastic and synthetic resins in the form of sheets, rods, foils, foams, bars, blocks and tubes; refractory semi-finished products made of plastic material, in particular made of fiber-reinforced plastic material, namely, synthetic plastic and synthetic resins in the form of sheets, rods, foils, foams, bars, blocks and tubes; semi-finished products made of artificial resin, in particular made of fiber-reinforced artificial resin in the form of sheets, rods, foils, foams, bars, blocks and tubes; all aforementioned products in particular for use in construction industry, shipbuilding, railway construction or aircraft construction