TS 10840 EN ISO 8785

TS 10840 EN ISO 8785 is a standard in the geometrical product specifications (GPS) field that establishes a common terminology and parameter-based approach for surface imperfections. Its purpose is to make sure the same surface condition is described consistently in drawings, technical specifications, and scientific or technical publications, while also providing a shared language for stating how surface imperfections are described and how measurement methods are referenced.

Why surface imperfections are treated as a separate topic

In general technical use, surface imperfections include localized irregularities such as scratches, dents, pits, blisters, or crack-like discontinuities, distinct from ordinary texture or process marks. Their significance depends on the application: they may affect appearance, contact behavior, sealing performance, friction, coating performance, or assembly fit. The value of this standard lies in reducing ambiguity when naming and documenting those imperfections.

What this standard provides

• It gathers terms and definitions related to surface imperfections.
• It establishes a common vocabulary for technical drawings, technical documents, and scientific publications.
• It supports expressing to what extent surface imperfections are permitted.
• It helps reference methods for measuring surface imperfections.
• It promotes consistent terminology when preparing geometrical product specifications.

This is primarily a terminology and specification reference rather than a product-specific inspection standard with numerical acceptance limits. It is especially useful wherever engineering communication needs a precise and shared way to discuss surface defects in design, manufacturing, and quality documentation.