ISO 25178-3-2012 PDF

Full title and description

Geometrical product specifications (GPS) — Surface texture: Areal — Part 3: Specification operators. This International Standard defines the complete specification operator used to specify areal (scale‑limited) surface texture measurands and prescribes the unambiguous sequence of operations for areal surface‑texture specification.

Abstract

This part of ISO 25178 specifies the complete specification operator for surface texture (scale‑limited surfaces) by areal methods. It provides the formal operator sequence (type of surface, extraction/association methods, filtering/nesting and evaluation area conventions) required to produce unambiguous areal surface‑texture measurands.

General information

• Status: Published (confirmed in review cycle; to be revised via a new committee draft currently in development).
• Publication date: 27 June 2012 (ISO record shows edition 1 — July 2012).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 17.040.20 — Properties of surfaces / Surface texture (GPS areal).
• Edition / version: Edition 1 (2012).
• Number of pages: 18 pages (official bibliographic records list 18 pages).

Scope

This standard specifies the complete specification operator for areal surface texture: it defines how to describe the type of surface to be evaluated (for example S‑F or S‑L), how to extract/associate an evaluation area, which filtration and nesting conventions to apply, and the sequence required to yield repeatable, unambiguous areal measurands for scale‑limited surfaces. The operator is intended to support specification and verification of areal surface texture in metrology and product specifications.

Key topics and requirements

• Definition of the "complete specification operator" for areal surface texture (sequence of operations needed to define a measurand).
• Distinction of surface types (e.g., S‑F vs S‑L) and corresponding evaluation‑area conventions.
• Extraction and association rules for selecting evaluation areas from measured topography.
• Filtration and nesting index conventions (L‑ and S‑filters) required to produce scale‑limited surfaces.
• Requirements to ensure unambiguous, repeatable interpretation of areal texture parameters and measurands in specifications and conformity assessment.
• Normative references and alignment with other GPS filtration/extraction standards to ensure interoperability of measurement results.

Typical use and users

Used by metrology laboratories, product designers, quality/inspection engineers, standards developers and instrument/software vendors involved with areal (3‑D) surface texture measurement and specification. Typical uses include writing product tolerances, declaring measurand definitions in drawings and technical specifications, implementing measurement software, and performing verification and acceptance testing of surfaces.

Related standards

ISO 25178‑3 is part of the ISO 25178 areal surface‑texture series (e.g., Part 1 — indication of surface texture; Part 2 — terms, definitions and parameters; Part 6 — classification of measuring methods; Parts 600+ — metrological and instrument nominal characteristics; Parts 70–72 — software, material measures and file formats). It also links normatively to filtration and extraction standards (eg. ISO/TS 16610 series for filtration and ISO 14406 for extraction) used when implementing the specification operator.

Keywords

areal surface texture, surface texture, GPS, specification operator, S‑F, S‑L, filtration, extraction, nesting index, areal measurand, ISO 25178.

FAQ

Q: What is this standard?

A: ISO 25178‑3:2012 is the ISO part that defines the complete specification operator for areal (3‑D) surface texture — the formal sequence of operations needed to specify areal surface‑texture measurands.

Q: What does it cover?

A: It covers the operator elements required to define an areal measurand unambiguously: type of surface, extraction/association of evaluation area, filtration and nesting conventions, and ordering of operations so results are repeatable and comparable.

Q: Who typically uses it?

A: Metrology and QA/QC engineers, standards writers, instrument and software developers, and manufacturers who specify or verify areal surface texture. It is used where 3‑D topography measurands must be specified unambiguously.

Q: Is it current or superseded?

A: The 2012 edition is published and has been maintained in ISO's review cycle (the record indicates confirmation/review activity in 2023). A committee draft to revise/replace the part is also in development, so the 2012 edition remains current until a new edition is published.

Q: Is it part of a series?

A: Yes — ISO 25178 is a multi‑part series addressing areal surface texture (indication, terms/parameters, operators, measurement classification, instrument characteristics, software and file formats). ISO 25178‑3 is the part that delivers the specification operator concept within that series.

Q: What are the key keywords?

A: Areal surface texture, GPS, specification operator, filtration, extraction, S‑F, S‑L, nesting index, areal measurand.