EN ISO 20274:2017

SLOVENSKI STANDARD
01-november-2017
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UD]WH]QRVWL,62
Vitreous and porcelain enamels - Preparation of samples and determination of thermal
expansion coefficient (ISO 20274:2017)
Emails und Emaillierungen - Herstellung von Proben und Bestimmung des thermischen
Ausdehnungskoeffizienten (ISO 20274:2017)
Emaux vitrifiés - Préparation d'échantillons émaillés et détermination du coefficient de la
dilatation thermique (ISO 20274:2017)
Ta slovenski standard je istoveten z: EN ISO 20274:2017
ICS:
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20274
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2017
EUROPÄISCHE NORM
ICS 25.220.50
English Version
Vitreous and porcelain enamels - Preparation of samples
and determination of thermal expansion coefficient (ISO
20274:2017)
Emaux vitrifiés - Préparation d'échantillons d'émail et Emails und Emaillierungen - Herstellung von Proben
détermination du coefficient de dilatation thermique und Bestimmung des thermischen
(ISO 20274:2017) Ausdehnungskoeffizienten (ISO 20274:2017)
This European Standard was approved by CEN on 22 June 2017.

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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20274:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 20274:2017) has been prepared by Technical Committee ISO/TC 107 “Metallic
and other inorganic coatings” in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
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 February 2018, and conflicting national standards
shall be withdrawn at the latest by February 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.
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 20274:2017 has been approved by CEN as EN ISO 20274:2017 without any modification.
INTERNATIONAL ISO
STANDARD 20274
First edition
2017-07
Vitreous and porcelain enamels —
Preparation of samples and
determination of thermal expansion
coefficient
Emaux vitrifiés — Préparation d’échantillons d’émail et
détermination du coefficient de dilatation thermique
Reference number
ISO 20274:2017(E)
©
ISO 2017
ISO 20274:2017(E)
© 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
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copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 20274:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 1
5 Requirements for the test specimen . 1
6 Preparation of the test specimens . 2
6.1 General . 2
6.2 Production by casting. 2
6.3 Production by drawing out of the melt . 2
6.4 Production by sintering . 3
7 Determination of the thermal expansion coefficient . 3
8 Calculation and indication of the results . 4
9 Test report . 4
Annex A (informative) Metallic casting mould . 5
Annex B (informative) Drawing from the melt . 6
ISO 20274:2017(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).
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URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings.
iv © ISO 2017 – All rights reserved

ISO 20274:2017(E)
Introduction
The thermal expansion coefficient of enamel and the relevant substrate is an important material
characteristic, as it provides information on the stress ratios in the composite material.
INTERNATIONAL STANDARD ISO 20274:2017(E)
Vitreous and porcelain enamels — Preparation of samples
and determination of thermal expansion coefficient
1 Scope
This document specifies the procedures for the preparation of enamel samples for measurement of the
thermal length change and calculation of the thermal expansion coefficient.
2 Normative references
The following documents are referred to in the text in s
...