ISO 20457:2018 PDF

Scope: This document specifies possible manufacturing tolerances for plastic moulded parts. This document specifies all integral features with general tolerances with surface profile tolerance within a specified datum system. It allows for additional specifications in case of functional needs and requirements using the ISO-GPS-tools for dimensional and geometrical tolerating. This document addresses injection moulding, injection compression moulding, transfer moulding, compression moulding and rotational moulding of non-porous moulded parts made from thermoplastics, thermoplastic elastomers and thermosets of thermoplastics. This document is applicable to other plastic processes if agreed to by the contractual parties. Moulded part surface imperfections such as sink marks, undesired flow structures and roughness, as well as joint lines are not addressed in this document. This document is not intended to supplant, replace or in any way interfere with requirements for tolerances found in product standards.

ISO 20457:2018 Referenced Document

ISO 10135:2007 Geometrical product specifications (GPS) - Drawing indications for moulded parts in technical product documentation (TPD)
ISO 14405-1:2016 Geometrical product specifications (GPS) - Dimensional tolerancing - Part 1: Linear sizes
ISO 2577:2007 Plastics - Thermosetting moulding materials - Determination of shrinkage
ISO 286-1:2010 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits
ISO 286-2:2010 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
ISO 291:2008 Plastics - Standard atmospheres for conditioning and testing
ISO 294-4:2001 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage
ISO 8015:2011 Geometrical product specifications (GPS) - Fundamentals - Concepts, principles and rules

2018 ISO 20457:2018 Plastics moulded parts - Tolerances and acceptance conditions