The composite ethylene gas made from benzene( adopted from coal tar or petroleum) and ethylene gas, is dehydrogenated by metal oxide catalyzer heated to 600 celsius degree into styrene monomer, which is then catalyzed and aggregated into polystryreneresin through such catalyzer as inorgranic peroxide. The polystyrene resin in the market is colorless and transparent, hard and slightly crispy, with an average molecular weight of 70 thousand—1000 thousand. It is excellent in water resistance and electric insulation and can fight against erosion from strong acid or alkali, yet it is devoid of resistance against organic solvent and oil and is weak in heat resistance. Another important feature of polystryrene resin is that it is endowed with sound thermal stability and fluidity in fusing resin, and thereby can be molded very well. Though a bit crispy, the PS can be colored freely, high impact polystyrene( HIPS) resin is obtained by adding butadiene and styene copolymerized rubber in styrene resin, wherein the two substances are in several hierarchies respectively, in addition, ultraviolet radiation absorbent or antioxidant can be added therein to improve lightfastness and also fiberglass is sometimes added into the basal material to increase intensity.
PS caters to the transparency and color tone of modern visual beauty. It can be extensively applied to the manufacturing of table articles like bread boxes and beef oil cans, commodity containers, toys, fruit dishes, handles of toothbrushes or brushes, soapboxes as well as flavoring containers etc.