Tolerancing of plastic molded parts (according to ISO 20457/DIN 16742)


It is important for the manufacturer of plastic moulded parts and for the customer to agree meaningful dimensional tolerances. Too high accuracy requirements lead to high costs, e.g. for tools, in the production of moulded parts and thus in quality assurance. The dimensional, shape and position deviations in the application and production of plastic moulded parts cannot be compared with those of metal parts, as the properties of plastics and metals may differ considerably in application and production. The application of the new ISO 20457/DIN 16742 is recommended in order to take the technically feasible accuracies into account during the development of moulded parts.