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ISO 7668:2021

Anodizing of aluminium and its alloys — Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 20°, 45°, 60° or 85°

Publication date:   Aug 17, 2021

General information

90.20   Standard under periodical review   Jul 15, 2026

ISO

ISO/TC 79/SC 2 Organic and anodic oxidation coatings on aluminium

International Standard

25.220.20   Surface treatment

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Scope

This document specifies methods for the measurement of specular reflectance and specular gloss of flat samples of anodized aluminium using geometries of 20° (Method A), 45° (Method B), 60° (Method C) and 85° (Method D) and of specular reflectance by an additional 45° method (Method E) employing a narrow acceptance angle.
The methods described are intended mainly for use with clear anodized surfaces. They can be used with colour-anodized aluminium, but only with similar colours.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7668:2018

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PUBLISHED
ISO 7668:2021
90.20 Standard under periodical review
Jul 15, 2026