EN ISO 20266:2020

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

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.

Contents Page
European foreword . 3

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
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.

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
ISO 20266:2018(E)
© 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.
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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

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 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

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.
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 15
...