Complete Guide to the ISO 20457 Tolerance Table Specifying the correct dimensional limits for plastic parts is one of the most critical challenges in modern manufacturing. Unlike rigid metals, polymers exhibit complex behaviors like high thermal expansion, molecular orientation, and significant volumetric shrinkage. To address these unique properties, the International Organization for Standardization developed ( Plastics molded parts — Tolerances and acceptance conditions ).
Best Practices for Specifying ISO 20457 on Engineering Drawings iso 20457 tolerance table pdf
Tight, precision tolerances. These require highly optimized tool designs, high-end materials, and strict process control (often resulting in higher production costs). Complete Guide to the ISO 20457 Tolerance Table
Determine if your plastic resin falls into a low, medium, or high-shrinkage category. Best Practices for Specifying ISO 20457 on Engineering
It establishes realistic dimensional tolerances based on material properties. It defines acceptance conditions for quality control.