Paints and varnishes - Visual comparison of colour of paints (ISO 3668:2017)

ISO 3668:2017 specifies a method for the visual comparison of the colour of films of paints or related products against a standard (either a reference standard or a freshly prepared standard) using artificial light sources in a standard booth.
It is not applicable to coatings containing special-effect pigments, e.g. metallic, without previous agreement on all details of illuminating and viewing conditions

Beschichtungsstoffe - Visueller Vergleich der Farbe von Beschichtungen (ISO 3668:2017)

Dieses Dokument legt ein Verfahren zum visuellen Abmustern der Farbe von Beschichtungen gegen einen Standard (entweder einen Bezugsstandard oder einen frisch hergestellten Standard) unter künstlichen Lichtquellen in einer Farbabmusterungskabine fest.
Es ist nicht anwendbar auf Beschichtungen, die spezielle Effektpigmente, z. B. Metalleffektpigmente, enthalten, wenn nicht alle Einzelheiten der Beleuchtungs  und Beobachtungsbedingungen vorher vereinbart wurden.

Peintures et vernis - Comparaison visuelle de la couleur des peintures (ISO 3668:2017)

Le présent document spécifie une méthode de comparaison visuelle de la couleur de feuils de peinture ou de produits assimilés par rapport à un étalon (soit un étalon de référence, soit un étalon fraîchement préparé) utilisant des sources de lumière artificielle dans une cabine normalisée.
Il ne s'applique pas aux revêtements contenant des pigments à effets spéciaux, par exemple métalliques, sans accord préalable sur tous les détails concernant les conditions d'éclairage et d'observation.

Barve in laki - Vizualna primerjava barve premazov (ISO 3668:2017)

General Information

Status
Published
Publication Date
11-Feb-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
12-Feb-2020
Completion Date
12-Feb-2020

RELATIONS

Buy Standard

Standard
EN ISO 3668:2020
English language
15 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Standard
EN ISO 3668:2020
English language
15 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 3668:2020
01-april-2020
Nadomešča:
SIST EN ISO 3668:2002
Barve in laki - Vizualna primerjava barve premazov (ISO 3668:2017)
Paints and varnishes - Visual comparison of colour of paints (ISO 3668:2017)
Beschichtungsstoffe - Visueller Vergleich der Farbe von Beschichtungen (ISO
3668:2017)

Peintures et vernis - Comparaison visuelle de la couleur des peintures (ISO 3668:2017)

Ta slovenski standard je istoveten z: EN ISO 3668:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 3668:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 3668:2020
---------------------- Page: 2 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN ISO 3668:2001
English Version
Paints and varnishes - Visual comparison of colour of
paints (ISO 3668:2017)

Peintures et vernis - Comparaison visuelle de la Beschichtungsstoffe - Visueller Vergleich der Farbe von

couleur des peintures (ISO 3668:2017) Beschichtungen (ISO 3668:2017)
This European Standard was approved by CEN on 4 November 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3668:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668:2020 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668:2020 (E)
European foreword

The text of ISO 3668:2017 has been prepared by Technical Committee ISO/TC 35 "Paints and

varnishes” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 3668:2020 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which

is held by DIN.

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 August 2020, and conflicting national standards shall

be withdrawn at the latest by August 2020.

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 3668:2001.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 3668:2017 has been approved by CEN as EN ISO 3668:2020 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 3668:2020
---------------------- Page: 6 ----------------------
SIST EN ISO 3668:2020
INTERNATIONAL ISO
STANDARD 3668
Third edition
2017-05
Paints and varnishes — Visual
comparison of colour of paints
Peintures et vernis — Comparaison visuelle de la couleur des
peintures
Reference number
ISO 3668:2017(E)
ISO 2017
---------------------- Page: 7 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Illumination for colour matching ........................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Artificial illumination by means of a colour matching booth ......................................................................... 2

6 Observer ........................................................................................................................................................................................................................ 2

7 Test panels and reference standards .............................................................................................................................................. 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Reference standards ........................................................................................................................................................................... 3

7.3 Preparation and coating ......... ......................................................................................................................................................... 3

7.4 Drying ............................................................................................................................................................................................................. 4

8 Procedure for colour comparison ...................................................................................................................................................... 4

8.1 General ........................................................................................................................................................................................................... 4

8.2 Colour comparison .............................................................................................................................................................................. 4

9 Assessment of metamerism ...................................................................................................................................................................... 4

10 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Colour difference rating scheme .................................................................................................................... 6

Annex B (informative) Metameric matches ................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2017 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(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: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.

This third edition cancels and replaces the second edition (ISO 3668:1998), which has been technically

revised with the following changes:
— testing using natural daylight has been deleted;
— CIE illuminant FL 11 has been added as third type of artificial light source;

— determination of the film thickness has been deleted because it is irrelevant for the assessment of

colour (the paint layer needs to be sufficient in hiding; the hiding power is more important);

— the normative references have been updated;

— the supplementary test conditions previously in Annex A have been integrated in the test report.

iv © ISO 2017 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 3668:2020
INTERNATIONAL STANDARD ISO 3668:2017(E)
Paints and varnishes — Visual comparison of colour of
paints
1 Scope

This document specifies a method for the visual comparison of the colour of films of paints or related

products against a standard (either a reference standard or a freshly prepared standard) using artificial

light sources in a standard booth.

It is not applicable to coatings containing special-effect pigments, e.g. metallic, without previous

agreement on all details of illuminating and viewing conditions
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 1514, Paints and varnishes — Standard panels for testing

ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 18314-1, Analytical colorimetry — Part 1: Practical colour measurement

ISO 23603, Standard method of assessing the spectral quality of daylight simulators for visual appraisal

and measurement of colour
CIE 15.3, Colorimetry

CIE 51.2, A method for assessing the quality of daylight simulators for colorimetry

3 Terms and definitions
No terms and definitions are listed in this document.

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Principle

The colours of the paint films to be compared are observed under specified illumination and viewing

conditions, using a colour matching booth. For the expression of colour difference components (hue,

chroma and lightness) a procedure is described, i.e. description by using a particular rating scheme.

Assessment of metamerism is also taken into account.
© ISO 2017 – All rights reserved 1
---------------------- Page: 11 -----------------
...

SLOVENSKI STANDARD
SIST EN ISO 3668:2020
01-april-2020
Nadomešča:
SIST EN ISO 3668:2002
Barve in laki - Vizualna primerjava barve premazov (ISO 3668:2017)
Paints and varnishes - Visual comparison of colour of paints (ISO 3668:2017)
Beschichtungsstoffe - Visueller Vergleich der Farbe von Beschichtungen (ISO
3668:2017)

Peintures et vernis - Comparaison visuelle de la couleur des peintures (ISO 3668:2017)

Ta slovenski standard je istoveten z: EN ISO 3668:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 3668:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 3668:2020
---------------------- Page: 2 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 87.040
English Version
Paints and varnishes - Visual comparison of colour of
paints (ISO 3668:2017)

Peintures et vernis - Comparaison visuelle de la Beschichtungsstoffe - Visueller Vergleich der Farbe von

couleur des peintures (ISO 3668:2017) Beschichtungen (ISO 3668:2017)
This European Standard was approved by CEN on 4 November 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3668:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668:2020 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 3668:2020
EN ISO 3668:2020 (E)
European foreword

The text of ISO 3668:2017 has been prepared by Technical Committee ISO/TC 35 "Paints and

varnishes” of the International Organization for Standardization (ISO) and has been taken over as

EN ISO 3668:2020 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which

is held by DIN.

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 August 2020, and conflicting national standards shall

be withdrawn at the latest by August 2020.

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.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 3668:2017 has been approved by CEN as EN ISO 3668:2020 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 3668:2020
---------------------- Page: 6 ----------------------
SIST EN ISO 3668:2020
INTERNATIONAL ISO
STANDARD 3668
Third edition
2017-05
Paints and varnishes — Visual
comparison of colour of paints
Peintures et vernis — Comparaison visuelle de la couleur des
peintures
Reference number
ISO 3668:2017(E)
ISO 2017
---------------------- Page: 7 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Illumination for colour matching ........................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Artificial illumination by means of a colour matching booth ......................................................................... 2

6 Observer ........................................................................................................................................................................................................................ 2

7 Test panels and reference standards .............................................................................................................................................. 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Reference standards ........................................................................................................................................................................... 3

7.3 Preparation and coating ......... ......................................................................................................................................................... 3

7.4 Drying ............................................................................................................................................................................................................. 4

8 Procedure for colour comparison ...................................................................................................................................................... 4

8.1 General ........................................................................................................................................................................................................... 4

8.2 Colour comparison .............................................................................................................................................................................. 4

9 Assessment of metamerism ...................................................................................................................................................................... 4

10 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Colour difference rating scheme .................................................................................................................... 6

Annex B (informative) Metameric matches ................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2017 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 3668:2020
ISO 3668:2017(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: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.

This third edition cancels and replaces the second edition (ISO 3668:1998), which has been technically

revised with the following changes:
— testing using natural daylight has been deleted;
— CIE illuminant FL 11 has been added as third type of artificial light source;

— determination of the film thickness has been deleted because it is irrelevant for the assessment of

colour (the paint layer needs to be sufficient in hiding; the hiding power is more important);

— the normative references have been updated;

— the supplementary test conditions previously in Annex A have been integrated in the test report.

iv © ISO 2017 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 3668:2020
INTERNATIONAL STANDARD ISO 3668:2017(E)
Paints and varnishes — Visual comparison of colour of
paints
1 Scope

This document specifies a method for the visual comparison of the colour of films of paints or related

products against a standard (either a reference standard or a freshly prepared standard) using artificial

light sources in a standard booth.

It is not applicable to coatings containing special-effect pigments, e.g. metallic, without previous

agreement on all details of illuminating and viewing conditions
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 1514, Paints and varnishes — Standard panels for testing

ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
ISO 18314-1, Analytical colorimetry — Part 1: Practical colour measurement

ISO 23603, Standard method of assessing the spectral quality of daylight simulators for visual appraisal

and measurement of colour
CIE 15.3, Colorimetry

CIE 51.2, A method for assessing the quality of daylight simulators for colorimetry

3 Terms and definitions
No terms and definitions are listed in this document.

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Principle

The colours of the paint films to be compared are observed under specified illumination and viewing

conditions, using a colour matching booth. For the expression of colour difference components (hue,

chroma and lightness) a procedure is described, i.e. description by using a particular rating scheme.

Assessment of metamerism is also taken into account.
© ISO 2017 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 3668:2020
ISO 366
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.