Overview
EN ISO 10135:2009 / ISO 10135:2007 - Geometrical product specifications (GPS) - Drawing indications for moulded parts in technical product documentation (TPD) - specifies rules and conventions for indicating requirements for moulded, cast or forged parts on technical drawings. The standard defines how to represent moulding-related features graphically and gives the proportions and dimensions of the graphical symbols used for consistent documentation. Adopted by CEN in January 2009, this is a GPS and TPD standard intended to improve clarity and reproducibility between designers, toolmakers and manufacturers.
Key Topics
- Scope and conventions for drawing indications specific to moulded parts (gates, parting surfaces, ejectors, etc.).
- Graphical symbol proportions (normative) - standard sizes and shapes for symbols used on drawings (see Annex A).
- Parting surfaces and tool markings - standardized ways to show parting lines, tool splits and anticipated tool features.
- Special ejector and tool-motion indicators - identifiers for ejector locations and directions of tool movement and part removal.
- Mismatch, flash, sinks and porosity - conventions to indicate typical moulding defects and their acceptable extents.
- Draft angles and surface enlargement - methods to document draft requirements and intentional surface changes to aid mould release.
- Extent of specification - how to limit the application of requirements to zones or features on a part.
- Dimensioning and tolerancing rules - linear and geometrical tolerancing practices applied to moulded parts, including datum considerations and surface texture indications.
- Annexes covering former practice and relation to the GPS matrix model for contextual use.
Applications
EN ISO 10135 is practical for:
- Product designers preparing drawings for injection-moulded, cast or forged components.
- Foundry, mould and tooling engineers defining tool design and expected part outcomes.
- Quality engineers and inspectors specifying allowable deviations (sinks, flash, mismatch, porosity).
- Drafting/CAD teams standardizing symbol libraries and TPD for global supply chains.
- Procurement and manufacturing teams ensuring contract drawings convey producibility and inspection requirements.
Using this standard reduces ambiguity in manufacturing instructions, helps align customer and supplier expectations, and supports consistent quality and reproducibility when molds are replaced or parts are produced across different facilities.
Related Standards
Relevant GPS and TPD standards referenced by ISO 10135 include:
- ISO 1101 (geometrical tolerancing), ISO 1302 (surface texture), ISO 129-1, ISO 128 series (drawing conventions)
- ISO 8062-1 (dimensional & geometrical tolerances for moulded parts)
- ISO 5459 (datums), ISO 8785 (surface imperfections), ISO/TR 14638 (GPS masterplan)
These references provide complementary rules for tolerancing, datums and surface specification.
