Also Called: Benzene, ethenyl-, homopolymer;Polystyrene;Styrene;polymer mainly composed of ethylstyrene and/or divinylbenzene and/or styrene and/or α-methylstyrene and/or 4-methylstyrene;Polystyrene beads [expandable];Polystyrene resin;Styrene, polymers;Ethenylbenzene homopolymer