3903 Polymers of styrene, in primary forms

3903 (01/1988-..) Polymers of styrene, in primary forms 39031100 (01/1988-..) Expansible polystyrene, in primary forms 39031900 (01/1988-..) Polystyrene, in primary forms (excl. expansible) 39032000 (01/1988-..) Styrene-acrylonitrile copolymers `SAN`, in primary forms 39033000 (01/1988-..) Acrylonitrile-butadiene-styrene copolymers `ABS`, in primary forms 39039000 (01/1988-12/1996) Polymers of styrene, in primary forms (excl. polystyrene, styrene-acrylonitrile copolymers `SAN` and acrylonitrile-butadiene-styrene `ABS`) 39039010 (01/1997-..) Copolymer solely of styrene with allyl alcohol, of an acetyl value of >= 175, in primary form 39039020 (01/1997-..) Brominated polystyrene containing by weight >= 58% but <= 71% of bromine, in blocks of irregular shape, lumps, powders, granules, flakes and similar bulk forms 39039090 (01/1997-..) Polymers of styrene, in primary forms (excl. polystyrene, styrene-acrylonitrile copolymers `SAN`, acrylonitrile-butadiene-styrene `ABS`, copolymer solely of styrene with allyl alcohol, of an acetyl value of >= 175 and brominated polystyrene, containing by weight >= 58% but <= 71% of bromine, in blocks of irregular shape, lumps, powders, granules, flakes and similar bulk forms)