1 Scope
This standard specifies the dimensional tolerances of thermosetting and thermoplastic moulded plastic parts (hereinafter referred to as moulded parts).
This standard is applicable to moulded plastic parts formed by injection molding, compression molding, transferring and casting. This standard is not applicable to workpieces formed by extrusion molding, blow molding, sintering and foaming.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 1800.2-2008 Geometrical product specifications (GPS) limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts (ISO 286-2: 1988, MOD)
GB/T 1844.1-2008 Plastics - Symbols and abbreviated terms - Part1: Basic polymers and their special characteristics (ISO 1043-1:2001, IDT)
GB/T 2035-2008 Terms and definitions for plastics (ISO 472:1999, IDT)
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing (idt ISO 291:1997)
GB/T 17037.4-2003 Plastic - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage (ISO 294-4:2001, IDT)
3 Terms, definitions and symbols
For the purpose of this standard, the terms, definitions and symbols defined in GB/T 2035-2008 and the following apply.
3.1
moulding shrinkage
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Basic requirements
5 Inspection method
6 Indication of dimensional tolerances
Annex A (Normative) Selection of tolerance grades for moulded plastic parts
