Vitreous and porcelain enamel finishes - Selection of test methods for vitreous and porcelain enamelled areas of articles (ISO 4528:2022)

This document gives guidance on the selection of test methods for evaluating the performance of vitreous and porcelain enamelled finishes in different applications. This document references the test methods available for measuring the properties of these finishes and correlates these properties to the requirements of specific enamelled articles.
This document is limited for the most part to test methods in ISO documents or European standards but does not provide acceptance criteria or performance limits for the properties.
This document is applicable to all enamelled articles, irrespective of their basis metals.

Emails und Emaillierungen - Auswahl von Prüfverfahren für emaillierte Flächen von Erzeugnissen (ISO 4528:2022)

Dieses Dokument stellt eine Leitlinie für die Auswahl von Prüfverfahren zur Bewertung der Gebrauchseigenschaften von Emails und Emaillierungen in verschiedenen Anwendungen dar. Sie nimmt Bezug auf verfügbare Prüfverfahren zur Bestimmung der Eigenschaften dieser Erzeugnisse und setzt diese Eigenschaften in Beziehung zu Anforderungen an spezifische, emaillierte Erzeugnisse.
Dieses Dokument bezieht sich größtenteils auf Prüfverfahren, die in Internationalen Normen der ISO und in Europäischen Normen beschrieben sind, und legt keine Annahmekriterien oder Grenzen der Gebrauchs-fähigkeit für die Eigenschaften fest.
Dieses Dokument gilt für alle emaillierten Erzeugnisse unabhängig vom Grundmetall.
WARNUNG - Diese Internationale Norm stimmt unter Umständen nicht mit der Arbeitsschutz-gesetzgebung einiger Länder überein und verlangt die Verwendung von Substanzen und/oder Verfahren, die bei Nichteinhaltung gewisser Sicherheitsmaßnahmen gesundheitsschädlich sein können. Diese Internationale Norm behandelt keine Gesundheitsgefährdungen, Sicherheits- oder Umweltaspekte und Gesetzgebungen, die mit ihrer Anwendung in Zusammenhang stehen. Der Anwender dieser Internationalen Norm ist dafür verantwortlich, Verfahren anzuwenden, die für die Gesundheit, Sicherheit und Umwelt hinnehmbar sind sowie geeignete Maßnahmen umzusetzen, um sämtlichen nationalen und internationalen Vorschriften zu entsprechen. Allein die Übereinstimmung mit der vorliegenden Internationalen Norm verleiht keine Befreiung von den gesetzlichen Verpflichtungen.

Finitions en émail vitrifié - Le choix des méthodes d'essai applicables aux surfaces émaillées de pièces (ISO 4528:2022)

Le présent document constitue un guide pour le choix des méthodes d’essai permettant l’évaluation des performances de finitions en émail vitrifié destinées à diverses applications. Il fournit la référence des méthodes d’essai existantes permettant de mesurer les propriétés de ces finitions, et établit la relation entre ces propriétés et les exigences propres à certaines pièces émaillées particulières.
Le présent document se limite dans sa plus grande partie aux méthodes d’essai issues de documents ISO ou de Normes européennes, mais il ne fournit ni les critères d’approbation ni les limites de performance pour lesdites propriétés.
Le présent document est applicable à toutes les pièces émaillées, quel que soit leur métal de base.

Steklasti in porcelanski zaključni emajli - Izbor preskusnih metod za emajlirane površine izdelkov (ISO 4528:2022)

General Information

Status
Published
Public Enquiry End Date
02-Sep-2021
Publication Date
13-Jul-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2022
Due Date
05-Sep-2022
Completion Date
14-Jul-2022

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SLOVENSKI STANDARD
SIST EN ISO 4528:2022
01-september-2022
Nadomešča:
SIST EN ISO 4528:2015
Steklasti in porcelanski zaključni emajli - Izbor preskusnih metod za emajlirane
površine izdelkov (ISO 4528:2022)

Vitreous and porcelain enamel finishes - Selection of test methods for vitreous and

porcelain enamelled areas of articles (ISO 4528:2022)

Emails und Emaillierungen - Auswahl von Prüfverfahren für emaillierte Flächen von

Erzeugnissen (ISO 4528:2022)

Finitions en émail vitrifié - Le choix des méthodes d'essai applicables aux surfaces

émaillées de pièces (ISO 4528:2022)
Ta slovenski standard je istoveten z: EN ISO 4528:2022
ICS:
25.220.50 Emajlne prevleke Enamels
SIST EN ISO 4528:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 4528:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 4528:2022
EN ISO 4528
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 25.220.50 Supersedes EN ISO 4528:2015
English Version
Vitreous and porcelain enamel finishes - Selection of test
methods for vitreous and porcelain enamelled areas of
articles (ISO 4528:2022)

Finitions en émail vitrifié - Le choix des méthodes Emails und Emaillierungen - Auswahl von

d'essai applicables aux surfaces émaillées de pièces Prüfverfahren für emaillierte Flächen von

(ISO 4528:2022) Erzeugnissen (ISO 4528:2022)
This European Standard was approved by CEN on 12 June 2022.

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

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4528:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 4528:2022
EN ISO 4528:2022 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 4528:2022
EN ISO 4528:2022 (E)
European foreword

This document (EN ISO 4528:2022) 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 December 2022, and conflicting national standards

shall be withdrawn at the latest by December 2022.

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 4528:2015.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN website.

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 4528:2022 has been approved by CEN as EN ISO 4528:2022 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 4528:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 4528:2022
INTERNATIONAL ISO
STANDARD 4528
Third edition
2022-06
Vitreous and porcelain enamel
finishes — Selection of test methods
for vitreous and porcelain enamelled
areas of articles
Finitions en émail vitrifié — Choix des méthodes d'essai applicables
aux surfaces émaillées de pièces
Reference number
ISO 4528:2022(E)
© ISO 2022
---------------------- Page: 7 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(E)
Contents Page

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

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

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

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

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

4  Selection of test methods ............................................................................................................................................................................ 1

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

iii
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(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 of 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

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,

in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC

262, Metallic and other inorganic coatings, in accordance with the Agreement on technical cooperation

between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 4258:2015), which has been technically

revised.
The main changes are as follows:
— the title has been changed;
— the list of test methods and properties has been updated.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(E)
Introduction

Standard test methods are required for measuring and controlling the properties and hence also the

quality of vitreous and porcelain enamelled finishes.

To ensure that these finishes meet the requirements of various applications, test methods are chosen to

measure the properties that are important to the function of a specific enamelled article.

© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 4528:2022
---------------------- Page: 12 ----------------------
SIST EN ISO 4528:2022
INTERNATIONAL STANDARD ISO 4528:2022(E)
Vitreous and porcelain enamel finishes — Selection of test
methods for vitreous and porcelain enamelled areas of
articles

WARNING — The use of this document can involve hazardous materials, operations and

equipment. It does not purport to address all of the safety or environmental problems associated

with its use. It is the responsibility of the user to establish appropriate safety and health

practices and to determine the applicability of any other restrictions.
1  Scope

This document gives guidance on the selection of test methods for evaluating the performance of

vitreous and porcelain enamelled finishes in different applications. This document references the test

methods available for measuring the properties of these finishes and correlates these properties to the

requirements of specific enamelled articles.

This document is limited for the most part to test methods in ISO documents or European standards

but does not provide acceptance criteria or performance limits for the properties.

This document is applicable to all enamelled articles, irrespective of their basis metals.

2  Normative references
There are no normative references in this document.
3  Terms and definitions
No terms and definitions are listed in this document.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4  Selection of test methods

The properties of enamelled surfaces are listed in Table 1, along with the numbers of the ISO test

methods by which they may be measured. The table identifies the tests that should be performed to

assess the performance of 30 specific enamelled articles. Suitable standard test methods are selected

by noting the specific tests recommended in the column for each of the enamelled articles.

© ISO 2022 – All rights reserved
---------------------- Page: 13 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(E)
Table 1 — Test methods for assessing the properties of enamelled articles
Number and description of enamelled article
1 2 3 4
Cookers Cookers Cookers Room
ISO or EN
(top plate) (baking com- [other  heating
No. Property
test method a
partment , grills,  components equipment
burner caps, pan  (excluding
supports,  cookware)]
accessories)
Methods of assessing resistance to chemical attack in various solutions
1 Cold citric acid ISO 28706-1 + + + +
b b
2 Cold sulfuric acid ISO 28706-1 - - + +
3 Boiling citric acid ISO 28706-2 - - - -
4 Boiling sulfuric acid ISO 28706-2 - - - -
Condensing hydrochloric ISO 28706-2
5 - - - -
acid vapour
Condensing products of EN 1856-1:2009,
6 - - - -
combustion vapour Annex A
7 Hot sodium hydroxide ISO 28706-4 - - - -
8 Boiling water ISO 28706-2: - - - -
9 Water vapour ISO 28706-2 - - - -
10 Hot standard detergent ISO 28706-3 - - - -
11 Liquid cleaners + + + +
12 Weathering resistance - - - -
13 Special corrosive substances ISO 28706-4 - - - -
14 Special corrosive substances ISO 28706-5 - - - -
Release of metal-ions for food con-
15 ISO 4531 - + - -
tact articles
16 Release of lead and cadmium ISO 4531 - - - -
Methods of assessing thickness and other properties
17 Thickness ISO 2178, ISO 2360 + + + +
18 Reflectivity and gloss ISO 2813 - - - -
19 Waviness - - - -
ISO 105-J03/
20 Colour + + + +
ISO 7724 (all parts)
21 Defects (visual inspection) + + + +
Continuity and porosity
22 ISO 8289-1 - - - -
(low voltage test)
Continuity and porosity
23 ISO 8289-2 - - - -
(low voltage test)
Continuity and porosity
24 ISO 2746 - - - -
(high voltage test)
25 Resistance to thermal shock ISO 2747 - - - -
Resistance to thermal shock ISO 28763:2019,
26 + + - +
Annex A
27 Resistance to thermal shock ISO 13807 - - - -
28 Resistance to heat ISO 4530 + + + +
29 Temperature class EN 1859 - - - -
30 Resistance to impact ISO 4532 + + + +
Adherence EN 10209:2013,
31 + + + +
Annex C
32 Abrasion resistance + + + -
Subsurface abrasion
33 ISO 6370-2 - - - -
resistance
34 Scratch resistance ISO 15695 - - - -
35 Scratch hardness EN 15771 - - - -
© ISO 2022 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 4528:2022
ISO 4528:2022(E)
Table 1 — (continued)
Number and description of enamelled article
5 6 7 8
ISO or EN
Cookware Cookware Chimneys and Tableware
No. Property
test method
(inside  (outside  flue pipes
surfaces  surfaces)
and utensils)
Methods of assessing resistance to chemical attack in various solutions
1 Cold citric acid ISO 28706-1 + + - +
2 Cold sulfuric acid ISO 28706-1 - - - -
3 Boiling citric acid ISO 28706-2 + - - -
4 Boiling sulfuric acid ISO 28706-2 - - - -
Condensing hydrochloric
5 ISO 28706-2 - - - -
acid vapour
Condensing products of EN 1856-1:2009,
6 - - (+) -
combustion vapour Annex A
7 Hot sodium hydroxide ISO 28706-4 - - - -
8 Boiling water ISO 28706-2 + - - -
9 Water vapour ISO 28706-2 + - - -
10 Hot standard detergent ISO 28706-3 - - - -
11 Liquid cleaners + + - +
12 Weathering resistance - - - -
13 Special corrosive substances ISO 28706-4 + + - +
14 Special corrosive substances ISO 28706-5 - - - -
Release of metal-ions for food con-
15 ISO 4531 + - - +
tact articles
16 Release of lead and cadmium ISO 4531 - - - -
Methods of assessing thickness and other properties
17 Thickness ISO 2178, ISO 2360 + + + +
18 Reflectivity and gloss ISO 2813 - - - -
19 Waviness - - - -
ISO 105-J03/
20 Colour + + - +
ISO 7724 (all parts)
21 Defects (visual inspection) + + (+) +
Continuity and porosity ISO 8289-1 - - - -
(low voltage test)
Continuity and porosity - - - -
23 ISO 8289-2
(low voltage test)
Continuity and porosity ISO 2746 - - - -
(high voltage test)
25 Resistance to thermal shock ISO 2747 + + - -
ISO 28763:2019, - - - -
26 Resistance to thermal shock
Annex A
27 Resistance to thermal shock ISO 13807 - - - -
28 Resistance to heat ISO 4530 - - - -
29 Temperature class EN 1859 - - + -
30 Resistance to impact ISO 4532 + + - +
EN 10209:2013, + + (+) +
31 Adherence
Annex C
32 Abrasion resistance + + - +
Subsurface abrasion ISO 6370-2 - - - -
resistance
34 Scratch resistance ISO 15695 - - - -
35 Scratch hardness EN 15771 - - - -
© ISO 2022 – All rights reserved
---------------------- Page: 15 ----------------------
SIST EN ISO 4528:2022
...

SLOVENSKI STANDARD
oSIST prEN ISO 4528:2021
01-september-2021
Steklasti in porcelanski zaključni emajli - Vodilo za izbor preskusnih metod za
emajlirane površine izdelkov (ISO/DIS 4528:2021)

Vitreous and porcelain enamel finishes - Guide to selection of test methods for vitreous

and porcelain enamelled areas of articles (ISO/DIS 4528:2021)

Emails und Emaillierungen - Leitlinie zur Auswahl von Prüfverfahren für emaillierte

Flächen von Erzeugnissen (ISO/DIS 4528:2021)

Finitions en émail vitrifié - Guide pour le choix des méthodes d'essai applicables aux

surfaces émaillées de pièces (ISO/DIS 4528:2021)
Ta slovenski standard je istoveten z: prEN ISO 4528
ICS:
25.220.50 Emajlne prevleke Enamels
oSIST prEN ISO 4528:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 4528:2021
---------------------- Page: 2 ----------------------
oSIST prEN ISO 4528:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4528
ISO/TC 107 Secretariat: KATS
Voting begins on: Voting terminates on:
2021-05-11 2021-08-03
Vitreous and porcelain enamel finishes — Guide to
selection of test methods for vitreous and porcelain
enamelled areas of articles

Finitions en émail vitrifié — Guide pour le choix des méthodes d'essai applicables aux surfaces émaillées

de pièces
ICS: 25.220.50
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4528:2021(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2021
---------------------- Page: 3 ----------------------
oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
Contents Page

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

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

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

2 Selection of test methods ............................................................................................................................................................................. 1

Bibliography .............................................................................................................................................................................................................................10

© ISO 2021 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(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 meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

ISO 4528 was prepared by the European Committee for Standardization (CEN) in collaboration with

ISO Technical Committee ISO/TC 107, Metallic and other inorganic coatings, in accordance with the

Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 4528:2015), which has been technically

revised.
iv © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
Introduction

Standard test methods are required for measuring and controlling the properties and hence also the

quality of vitreous and porcelain enamelled finishes.

To ensure that these finishes meet the requirements of various applications, test methods have to be

chosen to measure the properties that are important to the function of a specific enamelled article.

© ISO 2021 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 4528:2021
---------------------- Page: 8 ----------------------
oSIST prEN ISO 4528:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 4528:2021(E)
Vitreous and porcelain enamel finishes — Guide to
selection of test methods for vitreous and porcelain
enamelled areas of articles

WARNING — This International Standard might not be compliant with some countries’ health

and safety legislation and calls for the use of substances and/or procedures that can be injurious

to health if adequate safety measures are not taken. This International Standard does not

address any health hazards, safety, or environmental matters and legislations associated with

its use. It is the responsibility of the user of this International Standard to establish appropriate

health, safety, and environmentally acceptable practices and take suitable actions to comply

with any national and international regulations. Compliance with this International Standard

does not of itself confer immunity from legal obligations.
1 Scope

This International Standard is a guide to the selection of test methods for evaluating the performance

of vitreous and porcelain enamelled finishes in different applications. It references the test methods

available for measuring the properties of these finishes and correlates these properties to the

requirements of specific enamelled articles.

It is limited for the most part to test methods that are described in ISO International/European

Standards and does not provide acceptance criteria or performance limits for the properties.

This International Standard applies to all enamelled articles irrespective of their basis metals.

2 Selection of test methods

The properties of enamelled surfaces are listed in Table 1, along with the numbers of the ISO test

methods by which they may be measured. The table identifies the tests that should be performed to

assess the performance of 30 specific enamelled articles. Suitable standard test methods are selected

by noting the specific tests recommended in the column for each of the enamelled articles.

The following symbols are used in Table 1.
— + testing in accordance with the method given is suitable;

— (+) the test method that is cited may need to be modified to take into account special requirements

of a specific application;
— - the test is not applicable and/or the test method is not suitable.
© ISO 2021 – All rights reserved 1
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oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
Table 1 — Test methods for assessing the properties of enamelled articles
Number and description of enamelled article
1 2 3 4
Cookers Cookers Cookers Room
(top plate) (baking com- [other heating
ISO or EN
No. Property a
partment , components equipment
test method
grills, burner (excluding
caps, pan cookware)]
supports, acces-
sories)
Methods of assessing resistance to chemical attack in various solutions
1 Cold citric acid ISO 28706-1 + + + +
b b
2 Cold sulfuric acid ISO 28706-1 - - + +
3 Boiling citric acid ISO 28706-2 - - - -
4 Boiling sulfuric acid ISO 28706-2 - - - -
Condensing hydrochloric acid ISO 28706-2
5 - - - -
vapour
Condensing products of com-
6 EN 1856–1, Annex A - - - -
bustion vapour
7 Hot sodium hydroxide ISO 28706-4 - - - -
8 Boiling water ISO 28706-2: - - - -
9 Water vapour ISO 28706-2 - - - -
10 Hot standard detergent ISO 28706-3 - - - -
11 Liquid cleaners + + + +
12 Weathering resistance - - - -
13 Special corrosive substances ISO 28706-4 - - - -
14 Special corrosive substances ISO 28706-5 - - - -
Release of metal-ions for food
15 ISO 4531 - + - -
contact articles
16 Release of lead and cadmium ISO 4531 - - - -
Methods of assessing thickness and other properties
17 Thickness ISO 2178, ISO 2360 + + + +
18 Reflectivity and gloss ISO 2813 - - - -
19 Waviness - - - -
20 Colour ISO 105-J03/ISO 7724 (all parts) + + + +
21 Defects (visual inspection) + + + +
Continuity and porosity (low
2 ISO 8289-1 - - - -
voltage test)
Continuity and porosity (low
23 ISO 8289-2 - - - -
voltage test)
Continuity and porosity (high
24 ISO 2746 - - - -
voltage test)
25 Resistance to thermal shock ISO 2747 - - - -
26 Resistance to thermal shock ISO 28763, Annex A + + - +
27 Resistance to thermal shock ISO 13807 - - - -
28 Resistance to heat ISO 4530 + + + +
29 Temperature class EN 1859 - - - -
30 Resistance to impact ISO 4532 + + + +
31 Adherence EN 10209, Annex C + + + +
32 Abrasion resistance + + + -
33 Subsurface abrasion resistance ISO 6370-2 - - - -
34 Scratch resistance ISO 15695 - - - -
35 Scratch hardness EN 15771 - - - -
2 © ISO 2021 – All rights reserved
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oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
Table 1 — (continued)
Number and description of enamelled article
5 6 7 8
ISO or EN
Cookware Cookware Chimneys Tableware
No. Property
test method
(inside (outside sur- and
surfaces and faces) flue pipes
utensils)
Methods of assessing resistance to chemical attack in various solutions
1 Cold citric acid ISO 28706-1 + + - +
2 Cold sulfuric acid ISO 28706-1 - - - -
3 Boiling citric acid ISO 28706-2 + - - -
4 Boiling sulfuric acid ISO 28706-2 - - - -
Condensing hydrochloric acid
5 ISO 28706-2 - - - -
vapour
Condensing products of combus-
6 EN 1856–1, Annex A - - (+) -
tion vapour
7 Hot sodium hydroxide ISO 28706-4 - - - -
8 Boiling water ISO 28706-2 + - - -
9 Water vapour ISO 28706-2 + - - -
10 Hot standard detergent ISO 28706-3 - - - -
11 Liquid cleaners + + - +
12 Weathering resistance - - - -
13 Special corrosive substances ISO 28706-4 + + - +
14 Special corrosive substances ISO 28706-5 - - - -
Release of metal-ions for food
15 ISO 4531 + - - +
contact articles
16 Release of lead and cadmium ISO 4531 - - - -
Methods of assessing thickness and other properties
17 Thickness ISO 2178, ISO 2360 + + + +
18 Reflectivity and gloss ISO 2813 - - - -
19 Waviness - - - -
20 Colour ISO 105-J03/ISO 7724 (all parts) + + - +
21 Defects (visual inspection) + + (+) +
Continuity and porosity (low ISO 8289-1 - - - -
voltage test)
Continuity and porosity (low - - - -
23 ISO 8289-2
voltage test)
Continuity and porosity (high ISO 2746 - - - -
voltage test)
25 Resistance to thermal shock ISO 2747 + + - -
26 Resistance to thermal shock ISO 28763, Annex A - - - -
27 Resistance to thermal shock ISO 13807 - - - -
28 Resistance to heat ISO 4530 - - - -
29 Temperature class EN 1859 - - + -
30 Resistance to impact ISO 4532 + + - +
31 Adherence EN 10209, Annex C + + (+) +
32 Abrasion resistance + + - +
33 Subsurface abrasion resistance ISO 6370-2 - - - -
34 Scratch resistance ISO 15695 - - - -
35 Scratch hardness EN 15771 - - - -
© ISO 2021 – All rights reserved 3
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oSIST prEN ISO 4528:2021
ISO/DIS 4528:2021(E)
Table 1 — (continued)
Number and description of enamelled article
9 10 11 12
ISO or EN
No. Property
Sinks Refrigerators Refrigerators Washing
test method
(inside surfaces) (outside sur- machines
faces) (drum)
Methods of assessing resistance to chemical attack in various solutions
1 Cold citric acid ISO 28706-1 + + + +
2 Cold sulfuric acid ISO 28706-1 + - - -
3 Boiling citric acid ISO 28706-2 + - - -
4 Boiling sulfuric acid ISO 28706-2 - - - -
Condensing hydrochloric acid
5 ISO 28706-2 - - - -
vapour
Condensing products of combus-
6 EN 1856–1, Annex A - - - -
tion vapour
7 Hot sodium hydroxide ISO 28706-4 - - - -
8 Boiling water ISO 28706-2 + - - +
9 Water vapour ISO 28706-2 - - - +
10 Hot detergent ISO 28706-3 + - - +
11 Liquid cleaners + + + -
12 Weathering resistance - - - -
13 Special corrosive substances ISO 28706-4 - - - -
14 Special corrosive substances ISO 28706-5 - - - -
Release of metal-ions for food
15 ISO 4531 - - - -
contact articles
16 Release of lead and cadmium ISO 4531 - - - -
Methods of assessing thickness and other properties
17 Thickness ISO 2178, ISO 2360 + + + +
18 Reflectivity and gloss ISO 2813 + - - -
19 Waviness - - - -
20 Colour ISO 105-J03/ISO 7724 (all parts) + + + -
21 Defects (visual inspection) + + + +
Continuity and porosity (low
2 ISO 8289-1 - - - +
voltage test)
Continuity and porosity (low
23 ISO 8289-2 - - - -
voltage test)
Continuity and porosity (high
24 ISO 2746 + - - -
voltage test)
25 Resistance to thermal shock ISO 2747 - - - -
26 Resistance to thermal shock ISO 28763, A
...

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