The reference ISO 20457 TG5 relates to specific dimensional tolerances for plastic injection molded parts
: Proper cooling and uniform wall thickness are essential for dimensional stability. Boyan Manufacturing Solutions Iso 20457 Tg5
Manufacturing and Quality Control
ISO 20457 mandates traceable material identification, mill test certificates verifying chemical composition and mechanical-test results, and non-destructive testing where applicable. It prescribes sampling, metallographic examination, and hardness testing protocols to ensure batch-to-batch consistency. Heat-treatment records and tempering-process controls are also important to demonstrate conformance to the TG5 property window. The reference ISO 20457 TG5 relates to specific
Permissible Range: For flatness and straightness, TG5 typically allows a variance between ±0.50plus or minus 0.50 ±1.00plus or minus 1.00 mm, depending on the length of the surface. interior trim). When recycled
Part Dimensions: The allowable deviation in TG5 scales with the size of the part; larger parts naturally have wider absolute tolerances.
Talc is a common filler in automotive plastics (dashboards, interior trim). When recycled, talc particles can agglomerate or become too fine. ISO 20457 TG5 provides the protocol for measuring the "mean particle size of mineral fillers" after recycling. If you are a buyer of recycled PP talc-filled 20%, you require a COA (Certificate of Analysis) that follows TG5. Without it, you risk nozzle blockages or surface defects (streaks).
The next morning, TG5’s inbox exploded. Six votes in favor. Twelve against. Four abstentions.