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Machine parameters alter the final part dimensions. Key factors include injection pressure, melt temperature, hold time, and cooling rates. 3. Material Properties
State when inspection should occur. Plastic parts change size for up to 48 hours post-ejection due to crystallization and cooling. A common note is: Dimensions to be measured 48 hours post-molding at 23°C .
The Ultimate Guide to the ISO 20457 Tolerance Table for Plastic Molded Parts
The system categorizes tolerances using , ranging from TG1 to TG9.