Summary of Common Plastic Specific Gravity and Shrinkage Rates

Shrinkage rate refers to the percentage difference between the size of a workpiece at the forming temperature and the size after being taken out of the mold and cooled to room temperature. It reflects the degree of size reduction of the workpiece after being taken out of the mold and cooled.

The factors that affect the shrinkage rate include material variety, forming conditions, mold structure, etc. The shrinkage rate of different materials varies. The shrinkage rate is also closely related to the shape of the plastic part, the complexity of the internal structure, and the presence of embedded components.