Characteristics of injection molding material PC plastic

(Polycarbonate)

Specific gravity: 1.18-1.20 g/cm3
Molding shrinkage: 0.5-0.8%
Molding temperature: 230-320℃
Drying conditions: 110-120℃ 8 hours

Material performance

High impact strength, good dimensional stability, colorless and transparent, good colorability, electrical insulation, corrosion resistance, wear resistance, but poor self-lubricity, stress cracking tendency, easy to hydrolyze at high temperature, poor compatibility with other resins . Suitable for making small instrument parts, insulating transparent parts and impact resistant parts

Forming performance

1. Amorphous material, good thermal stability, wide molding temperature range and poor fluidity. Low moisture absorption, but sensitive to water, it must be dried. Molding shrinkage is small, melting cracking and stress concentration are easy to occur, so molding conditions should be strictly controlled, and plastic parts must be annealed.

2. For plastic parts with high melting temperature, high viscosity, and greater than 200g, a heated extension nozzle is suitable.

3. The cooling rate is fast, and the mold casting system is based on the principle of thick and short. It is advisable to set up a cold material well, the gate should be large, and the mold should be heated.

4. Too low material temperature will cause material shortage, plastic parts will be dull, too high material temperature will easily overflow and plastic parts will foam. When the mold temperature is low, the shrinkage, elongation, and impact strength are high, and the bending, compression and tensile strength are low. When the mold temperature exceeds 120 degrees, the cooling of the plastic part is slow, and it is easy to deform and stick to the mold