Basic properties of polystyrene

Polystyrene (PS) includes ordinary polystyrene, expanded polystyrene (EPS), high impact polystyrene (HIPS) and syndiotactic polystyrene (SPS).

Ordinary polystyrene resin is non-toxic, odorless, colorless, transparent particles, and is a glass-like brittle material. Its products have extremely high transparency, with a light transmittance of more than 90%, good electrical insulation properties, and are easy to color and process. Good fluidity, good rigidity and good chemical corrosion resistance.

The disadvantages of ordinary polystyrene are that it is brittle, has low impact strength, is prone to stress cracking, has poor heat resistance and is not resistant to boiling water.

The burning performance of PVC is not good. It goes out immediately after leaving the fire. The flame is yellow, the lower end is green, and white smoke is emitted. It is a flame-retardant plastic. When it burns, it emits a pungent hydrogen chloride odor and softens when it burns.

In actual use, since PVC contains a large amount of organic esters (such as DOP) flammable plasticizers, flame retardancy must be considered. The use of antimony trioxide alone in PVC is flame retardant. If used together with chlorinated paraffin, the flame retardancy will be better.

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