EN ISO 7668:2018

SLOVENSKI STANDARD
01-maj-2018
1DGRPHãþD
SIST EN ISO 7668:2012
Anodizacija aluminija in aluminijevih zlitin - Merjenje odbojnosti in sijaja
anodizirane plasti pod koti 20°, 45°, 60° ali 85° (ISO 7668:2018)
Anodizing of aluminium and its alloys - Measurement of specular reflectance and
specular gloss of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60
degrees or 85 degrees (ISO 7668:2018)
Anodisieren von Aluminium und Aluminiumlegierungen - Messung des gerichteten
Reflexionsgrades und des Spiegelglanzes von anodisch erzeugten Oxidschichten bei
Winkeln von 20°, 45°, 60° oder 85° (ISO 7668:2018)
Anodisation de l'aluminium et de ses alliages - Mesurage des caractéristiques de
réflectivité et de brillant spéculaires des couches anodiques à angle fixe de 20 degrés,
45 degrés, 60 degrés ou 85 degrés (ISO 7668:2018)
Ta slovenski standard je istoveten z: EN ISO 7668:2018
ICS:
25.220.20 Površinska obdelava Surface treatment
77.120.10 Aluminij in aluminijeve zlitine Aluminium and aluminium
alloys
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7668
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 25.220.20 Supersedes EN ISO 7668:2010
English Version
Anodizing of aluminium and its alloys - Measurement of
specular reflectance and specular gloss of anodic oxidation
coatings at angles of 20 degrees, 45 degrees, 60 degrees or
85 degrees (ISO 7668:2018)
Anodisation de l'aluminium et de ses alliages - Anodisieren von Aluminium und
Mesurage des caractéristiques de réflectivité et de Aluminiumlegierungen - Messung des gerichteten
brillant spéculaires des couches anodiques à angle fixe Reflexionsgrades und des Spiegelglanzes von anodisch
de 20 degrés, 45 degrés, 60 degrés ou 85 degrés (ISO erzeugten Oxidschichten bei Winkeln von 20°, 45°, 60°
7668:2018) oder 85° (ISO 7668:2018)
This European Standard was approved by CEN on 14 March 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7668:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7668:2018) has been prepared by Technical Committee ISO/TC 79 "Light
metals and their alloys" in collaboration with Technical Committee CEN/TC 132 “Aluminium and
aluminium alloys”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2018, and conflicting national standards
shall be withdrawn at the latest by September 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7668:2010.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 7668:2018 has been approved by CEN as EN ISO 7668:2018 without any modification.

INTERNATIONAL ISO
STANDARD 7668
Third edition
2018-02
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°
Anodisation de l'aluminium et de ses alliages — Mesurage des
caractéristiques de réflectivité et de brillant spéculaires des couches
anodiques à angle fixe de 20°, 45°, 60° ou 85°
Reference number
ISO 7668:2018(E)
©
ISO 2018
ISO 7668:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 7668:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus and geometric conditions . 2
6 Optical standards . 6
6.1 Reference standards . 6
6.1.1 Black glass . 6
6.1.2 Glass prism (for Method E only). 6
6.2 Working standards . 7
6.2.1 Description . . . 7
6.2.2 Zero point check . 7
7 Preparation and calibration of apparatus . 7
8 Measurement of specular reflectance and specular gloss . 8
8.1 General . 8
8.2 Measurement of specular reflectance . 8
8.3 Measurement of specular gloss . 8
9 Expression of results .11
9.1 General .11
9.2 Specular reflectance .11
9.3 Specular gloss .12
10 Test report .12
Annex A (normative) Specular reflectance and specular gloss of black glass .13
ISO 7668:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium.
This third edition cancels and replaces the second edition (ISO 7668:2010), which has been technically
revised. The main technical changes are as follows:
— the normative references have been added;
— the definition of specular gloss has been revised;
— the references to CIE spectral luminous efficiency and CIE standard illuminants C and D65 have
been added.
iv © ISO 2018 – All rights reserved

ISO 7668:2018(E)
Introduction
Specular reflectance and specular gloss are not unique physical properties of a surface. They vary with
the angle of measurement, and with the aperture dimensions that define the incident and the reflected
beams, such that measurements of these properties are not independent of the apparatus being used.
The specular reflectance of m
...