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.

Polystyrene, abbreviated as PS, most commonly comes in two forms — foam, also known as expanded or extruded polystyrene, and rigid, solid plastic. These two forms of PS do not exhibit the same physical properties and have different applications as a result. This article will focus on two common types of polystyrene that SyBridge offers, solid and molded polystyrene.

Solid PS is a naturally transparent plastic that is also lightweight and inexpensive to manufacture. These qualities contribute to polystyrene’s popularity across industries, ranging from household products to manufacturing and machinery. PS can be mixed with additives and blended or copolymerized with other plastics to improve its material properties. This also makes PS very compatible with injection molding.

What is Polystyrene?
Polystyrene can be a thermoplastic or thermoset material depending on its polymeric arrangement. Thermosets cannot be remelted after initial forming, but thermoplastics can be melted and reused many times over. For this reason, thermoplastic PS can be used in injection molding and subsequently recycled.

The two most commonly used kinds of standard solid plastic polystyrene are:

General-purpose polystyrene (GPPS): GPPS is a hard, brittle homopolymer that is naturally clear but can be colored. Think of a CD plastic jewel case.
High-impact polystyrene (HIPS): HIPS is opaque, much less brittle than GPPS, and contains a polybutadiene rubber impact modifier. It is typically used in household and food packaging.
Polystyrene Properties and Mechanical Specifications
Polystyrene is non-toxic, odorless, and lightweight, making it very popular for food packaging applications. It also has high impact strength and good dimensional stability.

Here are some of the typical mechanical specifications for high-impact polystyrene:

Ultimate tensile strength: 28 MPa
Elongation at break: 55%
Flexural modulus: 1930 MPa
Impact strength (notched): 107 J/m
Heat deflection temperature: 92°C
One disadvantage of polystyrene is its poor chemical resistance. While this quality makes PS long-lasting in natural environments, it also makes PS nonbiodegradable. Polystyrene will, however, dissolve somewhat rapidly when put in contact with chlorinated solvents and other hydrocarbon substances. Another key disadvantage of molded PS is its brittle nature.

Why Choose Polystyrene?
Polystyrene has incredible dimensional stability, enhanced by the material’s water resistance, which allows it to remain consistent in size and shape despite varying external conditions. Polystyrene is also FDA compliant, meaning it is certified safe for use with food and beverage. In addition, PS is inexpensive and readily available.

Popular Polystyrene Uses
Solid plastic PS is commonly used to make medical products like Petri dishes or test tubes, but it can also be found in common household products like yogurt containers, smoke detector housings, and red Solo cups. You can also find polystyrene in automotive and electrical components and electronics. PS’s transparency also makes it an excellent choice for optic applications like lighting fixtures.

Polystyrene can be used to create living hinges, which are also often made from polypropylene. Butterfly hinges and snap closures are far more easily thermoformed with molded polystyrene than polypropylene, and PS hinges keep their shape despite repeated movement.