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)

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.

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)

Dieses Dokument legt Verfahren zur Messung des gerichteten Reflexionsgrades und des Spiegelglanzes von ebenen Proben aus anodisch oxidiertem Aluminium unter Anwendung der geometrischen Messbedingungen bei 20° (Verfahren A), 45° (Verfahren B), 60° (Verfahren C) und 85° (Verfahren D) sowie ein weiteres Verfahren zur Messung des gerichteten Reflexionsgrades bei 45° (Verfahren E) fest, bei dem ein kleiner Empfängerwinkel verwendet wird.
Die beschriebenen Verfahren sind hauptsächlich für farblos anodisierte Oberflächen vorgesehen. Sie können für farbig anodisiertes Aluminium verwendet werden, aber nur bei gleichen Farben.

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)

L'ISO 7668:2018 spécifie des méthodes de mesure de la réflectivité spéculaire et du brillant spéculaire d'échantillons plats d'aluminium anodisé sous des angles de 20° (Méthode A), 45° (Méthode B), 60° (Méthode C) et 85° (Méthode D), plus une autre méthode à 45° (Méthode E) à petit angle d'ouverture pour le mesurage de la réflectivité spéculaire.
Les méthodes décrites sont principalement utilisables sur des surfaces plates anodisées claires. Elles peuvent être utilisées sur de l'aluminium anodisé coloré, mais dans ce cas, uniquement pour des couleurs semblables.

Anodizacija aluminija in aluminijevih zlitin - Merjenje odbojnosti in sijaja anodizirane plasti pod koti 20°, 45°, 60° ali 85° (ISO 7668:2018)

Ta dokument določa metode za merjenje refleksijske odbojnosti in refleksijskega sijaja ploskih vzorcev anodiziranega aluminija pod kotom 20° (metoda A), 45° (metoda B), 60° (metoda C)
in 85° (metoda D); in refleksijske odbojnosti z dodatno 45° metodo (metoda E), ki uporablja ozek sprejemni kot.
Opisane metode se povečini uporabljajo na čistih anodiziranih površinah. Lahko se uporabljajo z barvno-anodiziranim aluminijem, a le s podobnimi barvami.

General Information

Status
Published
Public Enquiry End Date
24-Sep-2017
Publication Date
15-Apr-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Apr-2018
Due Date
08-Jun-2018
Completion Date
16-Apr-2018

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SLOVENSKI STANDARD
SIST EN ISO 7668:2018
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
SIST EN ISO 7668:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 7668:2018
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SIST EN ISO 7668:2018
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.
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SIST EN ISO 7668:2018
EN ISO 7668:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 7668:2018
EN ISO 7668:2018 (E)
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.

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SIST EN ISO 7668:2018
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SIST EN ISO 7668:2018
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
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SIST EN ISO 7668:2018
ISO 7668:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 7668:2018
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 2018 – All rights reserved iii
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SIST EN ISO 7668:2018
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
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SIST EN ISO 7668:2018
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 most surfaces increases with the angle of measurement and accounts for the

use of reflectometers with various angles as, for example, for painted surfaces. The specular reflectance

characteristics of anodized aluminium, however, do not always behave in the normal manner and,

because of its property of double reflection, reflected light comes partly from the film surface and

partly from the underlying metal. It is advisable to measure the specular reflectance characteristics at

20°, 45°, 60° and 85° to obtain a complete understanding of the specular reflectance properties of the

anodized surface, and careful thought should be given to which method or methods are most relevant

in any particular situation. The specular reflectance of bright-anodized aluminium with a mirror finish

is best measured using 45° or 20° geometry.
© ISO 2018 – All rights reserved v
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SIST EN ISO 7668:2018
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SIST EN ISO 7668:2018
INTERNATIONAL STANDARD ISO 7668:2018(E)
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°
1 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.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 7583, Anodizing of aluminium and its alloys — Terms and definitions
ISO 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
CIE Publication No. 15, Colorimetry
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 7583 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso. org/obp
— IEC Electropedia: available at http:// www.el ectropedia. org/
3.1
specular reflectance

ratio of the luminous flux, reflected in the specular direction for a specified source and receptor angle,

to the luminous flux of the incident light
Note 1 to entry: Normally expressed as a percentage.
© ISO 2018 – All rights reserved 1
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SIST EN ISO 7668:2018
ISO 7668:2018(E)
3.2
specular gloss

ratio of the luminous flux, reflected from an object in the specular direction for a specified source

and receptor angle, to the luminous flux reflected from glass with a refractive index of 1,567 at a

wavelength of 546,1 nm (which is the central wavelength of the spectral luminous efficiency function)

in the specular direction

Note 1 to entry: To set the specular gloss scale, polished black glass with a refractive index of 1,567 is assigned

the value of 100 for geometries of 20°, 45°, 60° and 85° (see Table 5). The phenomenon of light reflectance by

anodized aluminium is very different to that of black glass and the choice of a black-glass standard is arbitrary

and made to allow comparison of different qualities of anodized aluminium.
4 Principle

The specular reflectance and specular gloss of anodized aluminium surfaces are measured under

defined conditions using, as required, geometries of 20°, 45°, 60° and 85°.
5 Apparatus and geometric conditions
Usual laboratory apparatus and in particular the following.

5.1 General. Approximate comparisons between surfaces of the same colour can be made, but an

accurate measurement requires the combination of light source, photoelectric cell and associated colour

filters to give a spectral sensitivity, approximating to the CIE spectral luminous efficiency, V(λ), weighted

for CIE standard illuminants C or D65. V(λ) shall conform to the requirements of ISO 11664-1. CIE

standard illuminants C and D65 shall conform to the requirements of CIE 15 and ISO 11664-2.

NOTE Since specular reflection is in general spectrally non
...

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