BS ISO 20457:2018
$167.15
Plastics moulded parts. Tolerances and acceptance conditions
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 38 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Symbols and abbreviated terms 4.1 General 4.2 Symbols |
| 11 | 4.3 Abbreviated terms 5 Tolerancing of plastic moulded parts 5.1 General |
| 12 | 5.2 Intention |
| 13 | 5.3 General tolerances 5.4 Direct tolerancing (individual tolerancing) 5.5 Tolerancing of draft angles |
| 14 | 5.6 Dimensioning, tolerancing and measuring of radii 5.7 Specification of freeform surfaces 6 Moulding compound properties 6.1 General 6.2 Moulding shrinkage and shrinkage anisotropies |
| 15 | 6.3 Moulded material stiffness or hardness 7 Dimensional and geometrical tolerancing 7.1 Dimensional tolerancing 7.1.1 Tolerance grades for features of sizes |
| 19 | 7.1.2 Determination of the tolerance grades |
| 22 | 7.2 Geometrical tolerancing |
| 24 | 7.3 Parting line/Tool offset |
| 25 | 7.4 Tolerancing of angular dimensions 8 Acceptance conditions for moulded part production (ABF) |
| 26 | Annex A (informative) Dimensional reference levels for application and production of the moulded parts |
| 28 | Annex B (informative) Causes and influential factors on the moulding shrinkage of non-porous plastics |
| 30 | Annex C (informative) Evaluation of the production expense |
| 33 | Annex D (informative) Validation of machine or process capability |
| 34 | Annex E (informative) Main causes for dimension, form and location deviations in moulded part production |
| 35 | Annex F (informative) Example for determining the DP dimension for application of Table 9 |
| 36 | Annex G (informative) Feasible acceptance parameters |
| 37 | Bibliography |
