This document specifies the terms and definitions, technical requirements, test methods, sampling, inspection rules, signs, labels and accompanying documents, packaging, transportation and storage of recycled styrene. This document is applicable to recycled styrene produced through distillation or rectification process using styrene tar produced during the production of styrene through the ethylbenzene dehydrogenation process as raw material. The product can be used as an industrial styrene blending agent for polystyrene, Production of volatile polystyrene, acrylonitrile-butadiene copolymer, and unsaturated polyester resin.