Paints and varnishes - Determination of image clarity (degree of sharpness of reflected or transmitted image) (ISO 20266:2018)

This document specifies an instrumental method for determining the image clarity on paint films (coatings) by measuring reflection from the specimen surface or transmission through the specimen.
The method can be applied only to a flat surface.

Beschichtungsstoffe - Bestimmung der Abbildungsschärfe (Grad der Schärfe von reflektierten oder durchscheinenden Bildern) (ISO 20266:2018)

Peintures et vernis - Détermination de la netteté de l'image (degré de netteté de l'image réfléchie ou transmise) (ISO 20266:2018)

Barve in laki - Določanje jasnosti slike (stopnja ostrine odsevnih ali presevnih slik) (ISO 20266:2018)

General Information

Status
Published
Public Enquiry End Date
01-Oct-2020
Publication Date
27-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Jan-2021
Due Date
18-Mar-2021
Completion Date
28-Jan-2021

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SLOVENSKI STANDARD
SIST EN ISO 20266:2021
01-marec-2021

Barve in laki - Določanje jasnosti slike (stopnja ostrine odsevnih ali presevnih slik)

(ISO 20266:2018)

Paints and varnishes - Determination of image clarity (degree of sharpness of reflected

or transmitted image) (ISO 20266:2018)
Beschichtungsstoffe - Bestimmung der Abbildungsschärfe (Grad der Schärfe von
reflektierten oder durchscheinenden Bildern) (ISO 20266:2018)

Peintures et vernis - Détermination de la netteté de l'image (degré de netteté de l'image

réfléchie ou transmise) (ISO 20266:2018)
Ta slovenski standard je istoveten z: EN ISO 20266:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 20266:2021 en,fr,de

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

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SIST EN ISO 20266:2021
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SIST EN ISO 20266:2021
EN ISO 20266
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 87.040
English Version
Paints and varnishes - Determination of image clarity
(degree of sharpness of reflected or transmitted image)
(ISO 20266:2018)

Peintures et vernis - Détermination de la netteté de Beschichtungsstoffe - Bestimmung der

l'image (degré de netteté de l'image réfléchie ou Abbildungsschärfe (Grad der Schärfe von reflektierten

transmise) (ISO 20266:2018) oder durchscheinenden Bildern) (ISO 20266:2018)
This European Standard was approved by CEN on 30 November 2020.

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 20266:2020 E

worldwide for CEN national Members.
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SIST EN ISO 20266:2021
EN ISO 20266:2020 (E)
Contents Page

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

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SIST EN ISO 20266:2021
EN ISO 20266:2020 (E)
European foreword

The text of ISO 20266:2018 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 20266:2020 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 June 2021, and conflicting national standards shall be

withdrawn at the latest by June 2021.

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 20266:2018 has been approved by CEN as EN ISO 20266:2020 without any modification.

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SIST EN ISO 20266:2021
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SIST EN ISO 20266:2021
INTERNATIONAL ISO
STANDARD 20266
First edition
2018-06
Paints and varnishes — Determination
of image clarity (degree of sharpness
of reflected or transmitted image)
Peintures et vernis — Détermination de la netteté de l'image (degré
de netteté de l'image réfléchie ou transmise)
Reference number
ISO 20266:2018(E)
ISO 2018
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SIST EN ISO 20266:2021
ISO 20266:2018(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
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 20266:2021
ISO 20266:2018(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

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

5 Limitations .................................................................................................................................................................................................................. 2

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Sampling ........................................................................................................................................................................................................................ 2

8 Test specimen .......................................................................................................................................................................................................... 2

8.1 Substrate ...................................................................................................................................................................................................... 2

8.2 Preparation and coating ......... ......................................................................................................................................................... 2

8.3 Drying and conditioning ................................................................................................................................................................. 2

8.4 Thickness of coating ........................................................................................................................................................................... 2

8.5 Specimen size ........................................................................................................................................................................................... 3

9 Procedure..................................................................................................................................................................................................................... 3

10 Calculation .................................................................................................................................................................................................................. 3

11 Test report ................................................................................................................................................................................................................... 4

Annex A (informative) Example of determination ................................................................................................................................. 5

Annex B (informative) Precision ............................................................................................................................................................................... 7

Bibliography .............................................................................................................................................................................................................................11

© ISO 2018 – All rights reserved iii
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SIST EN ISO 20266:2021
ISO 20266:2018(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 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 20266:2021
ISO 20266:2018(E)
Introduction

Visual assessment of the image clarity of paint films (coatings) is carried out by evaluating the sharpness

of an image reflected from a surface, using a specified incident angle, for reflection. For transmission,

image sharpness is evaluated by viewing a suitable target through the paint films. The degree of image

clarity is influenced by the clearness, surface irregularities and haziness of a surface(s). Gloss values

and haze values do not correctly assess this phenomenon. Image clarity is not the same as, and should

not be confused with, gloss or haze. Therefore, standardized methods for determining the optical

parameter of image clarity are needed.
© ISO 2018 – All rights reserved v
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SIST EN ISO 20266:2021
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SIST EN ISO 20266:2021
INTERNATIONAL STANDARD ISO 20266:2018(E)
Paints and varnishes — Determination of image clarity
(degree of sharpness of reflected or transmitted image)
1 Scope

This document specifies an instrumental method for determining the image clarity on paint films

(coatings) by measuring reflection from the specimen surface or transmission through the specimen.

The method can be applied only to a flat surface.
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 1513, Paints and varnishes — Examination and preparation of test samples
ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 4618, Paints and varnishes — Terms and definitions

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

ISO 17221, Plastics — Determination of image clarity (degree of sharpness of reflected or transmitted image)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 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 .electropedia .org/
3.1
image clarity

degree of sharpness of an image reflected by a specimen or transmitted through a specimen

Note 1 to entry: Image clarity is expressed as a percentage (%).
[SOURCE: ISO 17221:2014, 3.1]
4 Principle

For the measurement of image clarity, a lamp illuminates the narrow source aperture-slit. The

collimating lens projects a parallel beam upon the specimen. The image is
...

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