Styrene polymers are thermoplastic materials which occur in amorphous as well as in semi crystalline forms. In addition to the widespread, transparent Polystyrene (PS), various copolymers like the synthetic terpolymer acrylonitrile-butadiene styrene (ABS) represent an important group within this material family. The unsaturated hydrocarbon styrene (as basic material or copolymer component) is characteristic for the whole material family and significantly responsible for the properties.