Chemical Name: Polystyrene
English name: Polystyrene
Specific gravity: 1.05 g / cm 3
Mold shrinkage: 0.6-0.8%
Molding temperature: 170-250 ° C
Features: excellent electrical insulation (especially high-frequency insulation), colorless and transparent, light transmittance is second only to plexiglass, coloring water resistance, good chemical stability, general strength, but brittle, easy to produce stress cracking , not resistant to benzene, gasoline and other organic solvents.
Uses: Suitable for making insulating transparent parts, decorative parts and chemical instruments, optical instruments and other parts.
Molding characteristics:
1. Amorphous material, small moisture absorption, no need to dry fully, not easy to decompose, but large coefficient of thermal expansion, easy to produce internal stress. Good fluidity, can be formed by screw or plunger injection machine.
2. It is advisable to use high material temperature, high mold temperature, low injection pressure and prolonged injection time to reduce internal stress and prevent shrinkage and deformation.
3. Various forms of gates can be used, and the gates are connected with the circular arc of the plastic parts to avoid damage to the plastic parts when the gates are removed. The drafting angle is large and the ejection is uniform. The plastic parts have uniform wall thickness, preferably without inserts. If the inserts should be preheated.
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