Overview
ISO 10135:2007 - Geometrical Product Specifications (GPS) defines rules and conventions for representing requirements for moulded parts on technical product documentation (TPD). The standard covers how to indicate moulding-specific features (parting surfaces, gates, risers, ejectors, flash, mismatch, draft angles, etc.) and specifies the proportions and dimensions of the graphical symbols used on engineering drawings. It is applicable to parts produced by moulding, casting or forging where special drawing indications are needed to control inevitable deviations from ideal geometry.
Key Topics
- Drawing conventions and line types for distinguishing moulding features (refers to ISO 128 series).
- Letter symbols and graphical symbols (e.g., C, M, S, E, G, R, V, FL) for parting surfaces, tool markings and other mould elements.
- Parting surface indication: how to show fixed/movable mould halves and where to place global requirements such as permissible mismatch or flash.
- Tool markings and ejector identifiers: indicating maximum permissible deflection or tool contact zones.
- Mismatch, flash and extent of specification: graphical and textual ways to limit and document acceptable moulding imperfections.
- Draft (taper) and draft angles: conventions for indicating tapers required to enable part removal from the mould.
- Tool motion and part removal directions: symbols and placement for communicating moulding/assembly motions.
- Surface defects & special features: sinks, porosity, surface enlargement, identification/marking and undisturbed surfaces.
- Rules for linear and geometrical dimensioning & tolerancing: datums, surface texture and edge treatments relevant to moulded parts.
- Annex A (normative): precise proportions/dimensions of graphical symbols; Annexes B and C give background and GPS model relations.
Applications and Who Uses It
ISO 10135:2007 is used to ensure clear, consistent communication between:
- Design engineers and CAD draughtsmen preparing TPD for moulded parts
- Toolmakers and mould designers who require clear tool-mark indications
- Foundries, injection moulding and casting shops for production requirements
- Quality engineers and inspectors verifying permissible mismatch, flash and defects
- Purchasing and supplier quality teams to specify acceptable manufacturing tolerances
Practical benefits include reduced ambiguity on drawings, improved manufacturability, consistent quality control and easier replacement of moulds.
Related Standards
Key related GPS and drawing standards frequently used with ISO 10135:
Using ISO 10135:2007 alongside these standards ensures comprehensive, standardized technical product documentation for moulded, cast and forged components.
