Chemical name: Polyvinyl chloride specific gravity: 1.38 g / cm 3 Molding shrinkage: 0. 6-1. 5% Molding temperature: 160-190 ° C Features: mechanical properties, excellent electrical properties, strong acid and alkali resistance, good chemical stability, but low softening point. Suitable for making thin plates, wire and cable insulation, seals, etc. Molding characteristics: 1. Amorphous material, low moisture absorption and poor fluidity. In order to improve fluidity and prevent the occurrence of bubbles, the plastic can be pre-dried. The mold casting system should be short and thick, the gate section should be large, and there must be no dead angle. The mold must be cooled and the surface is chrome plated. 2. Due to its corrosive and fluid characteristics, it is best to use special equipment and molds. All products must be added with different types and amounts of additives as needed. 3, very easy to decompose, with steel at 200 °C. Copper contacts are more susceptible to decomposition and escape corrosion upon decomposition. Irritating gas. The molding temperature range is small. 4. When using the nozzle of the screw injection machine, the aperture should be large to prevent the dead angle from stagnation. Good with inserts, if there are inserts should be warmed up
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