Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (ISO 4531:2022)

This document specifies a simulating method of test for determination of the release of metal-ions from
enamelled articles, which are intended to come into contact with food.
This document also specifies limits for the release of metal-ions from enamelled articles, which are
intended to come into contact with food.
This document is applicable to enamelled articles, including tanks and vessels, which are intended to be
used for the preparation, cooking, serving and storage of food

Emails - Freisetzung aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln - Prüfverfahren und zulässige Grenzwerte (ISO 4531:2022)

Dieses Dokument legt ein Simulationsprüfverfahren zur Bestimmung der Freisetzung von Metallionen aus emaillierten Gegenständen fest, die für den Kontakt mit Lebensmitteln bestimmt sind.
Darüber hinaus werden auch Grenzwerte für die Freisetzung von Metallionen aus emaillierten Gegenständen festgelegt, die für den Kontakt mit Lebensmitteln bestimmt sind.
Es ist anwendbar für emaillierte Gegenstände, einschließlich Behältern und Gefäßen, die zum Zubereiten, Kochen, Servieren und Aufbewahren von Lebensmitteln bestimmt sind.

Émaux vitrifiés - Libération depuis les articles émaillés en contact avec les aliments - Méthode d'essai et limites (ISO 4531:2022)

Le présent document spécifie une méthode d’essai de simulation pour la détermination de la libération d’ions métalliques depuis les articles émaillés destinés à entrer en contact avec les denrées alimentaires.
Le présent document spécifie également les limites relatives à la libération d’ions métalliques depuis les articles émaillés destinés à entrer en contact avec les denrées alimentaires.
Le présent document est applicable aux articles émaillés, y compris réservoirs et récipients, destinés à la préparation, à la cuisson, au service et à la conservation des denrées alimentaires.

Steklasti in porcelanski emajli - Sproščanje iz emajliranih izdelkov v stiku z živili - Metode preskušanja in mejne vrednosti (ISO 4531:2022)

Ta dokument določa simulacijsko metodo preskusa za ugotavljanje sproščanja kovinskih ionov iz emajliranih izdelkov, ki pridejo v stik z živili. Določa pa tudi mejne vrednosti za sproščanje kovinskih ionov iz emajliranih izdelkov, ki pridejo v stik z živili. Ta dokument se uporablja za emajlirane izdelke, vključno s cisternami in posodami, ki se uporabljajo za pripravo, kuhanje, serviranje in shranjevanje živil.

General Information

Status
Published
Public Enquiry End Date
19-May-2021
Publication Date
12-May-2022
Current Stage
8100 - Objava popravka objave (Adopted Project 1)
Start Date
25-Jul-2022
Due Date
16-Aug-2022
Completion Date
16-Aug-2022

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SLOVENSKI STANDARD
SIST EN ISO 4531:2022
01-julij-2022
Nadomešča:
SIST EN ISO 4531:2018

Steklasti in porcelanski emajli - Sproščanje iz emajliranih izdelkov v stiku z živili -

Metode preskušanja in mejne vrednosti (ISO 4531:2022)

Vitreous and porcelain enamels - Release from enamelled articles in contact with food -

Methods of test and limits (ISO 4531:2022)

Emails - Freisetzung aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln -

Prüfverfahren und zulässige Grenzwerte (ISO 4531:2022)

Émaux vitrifiés - Libération depuis les articles émaillés en contact avec les aliments -

Méthode d'essai et limites (ISO 4531:2022)
Ta slovenski standard je istoveten z: EN ISO 4531:2022
ICS:
25.220.50 Emajlne prevleke Enamels
67.250 Materiali in predmeti v stiku z Materials and articles in
živili contact with foodstuffs
97.040.60 Kuhinjska posoda, jedilni Cookware, cutlery and
servisi in jedilni pribor flatware
SIST EN ISO 4531:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 4531:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 25.220.50; 67.250; 97.040.60 Supersedes EN ISO 4531:2018
English Version
Vitreous and porcelain enamels - Release from enamelled
articles in contact with food - Methods of test and limits
(ISO 4531:2022)

Émaux vitrifiés - Libération depuis les articles émaillés Emails - Freisetzung aus emaillierten Gegenständen für

en contact avec les aliments - Méthode d'essai et den Kontakt mit Lebensmitteln - Prüfverfahren und

limites (ISO 4531:2022) zulässige Grenzwerte (ISO 4531:2022)
This European Standard was approved by CEN on 13 April 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 4531:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531:2022 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531:2022 (E)
European foreword

This document (EN ISO 4531:2022) 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 November 2022, and conflicting national standards

shall be withdrawn at the latest by November 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 4531:2018.

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 4531:2022 has been approved by CEN as EN ISO 4531:2022 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 4531:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 4531:2022
INTERNATIONAL ISO
STANDARD 4531
Second edition
2022-04
Vitreous and porcelain enamels —
Release from enamelled articles in
contact with food — Methods of test
and limits
Émaux vitrifiés — Libération depuis les articles émaillés en contact
avec les aliments — Méthode d'essai et limites
Reference number
ISO 4531:2022(E)
© ISO 2022
---------------------- Page: 7 ----------------------
SIST EN ISO 4531:2022
ISO 4531:2022(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 4531:2022
ISO 4531:2022(E)
Contents Page

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

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

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

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

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

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

5 Reagents ........................................................................................................................................................................................................................ 2

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

7 Samples .......................................................................................................................................................................................................................... 3

8 Preparation of samples .................................................................................................................................................................................3

9 Test conditions .......................................................................................................................................................................................................4

10 Procedure ....................................................................................................................................................................................................................4

10.1 Release test ................................................................................................................................................................................................ 4

10.1.1 Release test lab apparatus ......................................................................................................................................... 4

10.1.2 Release from enamelled articles .......................................................................................................................... 5

10.2 Sampling the release test solution for analysis (sample measuring solution) ......... ...................... 5

11 Expression of results ....................................................................................................................................................................................... 6

11.1 Reporting ..................................................................................................................................................................................................... 6

11.2 Test report .................................................................................................................................................................................................. 6

Annex A (informative) Explanatory information on release limits ................................................................................... 8

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

iii
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 4531:2022
ISO 4531:2022(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 the European Committee for Standardization (CEN) Technical

Committee CEN/TC 262, Metallic and other inorganic coatings, including for corrosion protection and

corrosion testing of metals and alloys, 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 second edition cancels and replaces the first edition (ISO 4531:2018), which has been technically

revised.
The main changes are as follows:

— the release limit and explanatory information on release limit for aluminium has been updated;

— the Bibliography has been updated;
— the requirement to carry out testing on the same day has been added;
— the requirements of test reports have 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 4531:2022
ISO 4531:2022(E)
Introduction

The release of metal-ions from enamelled articles requires effective means of control to ensure

protection against possible hazards arising from the use of improperly formulated, applied and fired

enamels and/or inorganic decorations on food contact surfaces of enamelled articles used for the

preparation, cooking, serving and storage of foodstuffs.

As a secondary consideration, different requirements from country to country for the control of the

release of ions from the surfaces of enamelled articles present non-tariff barriers to international trade

in these commodities. Accordingly, there is a need to establish internationally accepted methods of

testing enamelled articles for the release of metal-ions.
© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 4531:2022
---------------------- Page: 12 ----------------------
SIST EN ISO 4531:2022
INTERNATIONAL STANDARD ISO 4531:2022(E)
Vitreous and porcelain enamels — Release from enamelled
articles in contact with food — Methods of test and limits
1 Scope

This document specifies a simulating method of test for determination of the release of metal-ions from

enamelled articles, which are intended to come into contact with food.

This document also specifies limits for the release of metal-ions from enamelled articles, which are

intended to come into contact with food.

This document is applicable to enamelled articles, including tanks and vessels, which are intended to be

used for the preparation, cooking, serving and storage of food.
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 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3585, Borosilicate glass 3.3 — Properties
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 4788, Laboratory glassware — Graduated measuring cylinders

ISO 28764, Vitreous and porcelain enamels — Production of specimens for testing enamels on sheet steel,

sheet aluminium and cast iron
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:

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

For the release of metal-ions, if present, from the surfaces of articles or test specimen, a mass fraction of

3 % (density) of an acetic acid solution shall be used. Three consecutive release tests shall be performed

on the same day using the same sample and a fresh test solution per test. The first two release test

solutions (M1, M2) are discarded. Only the third release test solution (M3) shall be used for analysis. A

blank test (B1, B2, B3) is required for each release test, of which only the third release test solution (B3)

shall be used for analysis.
© ISO 2022 – All rights reserved
---------------------- Page: 13 ----------------------
SIST EN ISO 4531:2022
ISO 4531:2022(E)
5 Reagents

During the determination, use only reagents of recognized analytical grade and only distilled water, or

water of equivalent purity, grade 3 water conforming to the requirements of ISO 3696.

It is permissible to prepare proportionately greater quantities of test solution and analytical solutions

than specified in 5.2.
5.1 Acetic acid, (CH COOH), concentrated, density ρ = 1,05 g/ml.
5.2 Test solution, acet
...

SLOVENSKI STANDARD
SIST EN ISO 4531:2022
01-julij-2022
Nadomešča:
SIST EN ISO 4531:2018

Steklasti in porcelanski emajli - Sproščanje iz emajliranih delcev v stiku z živili -

Metode preskušanja in mejne vrednosti (ISO 4531:2022)

Vitreous and porcelain enamels - Release from enamelled articles in contact with food -

Methods of test and limits (ISO 4531:2022)

Emails - Freisetzung aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln -

Prüfverfahren und zulässige Grenzwerte (ISO 4531:2022)

Émaux vitrifiés - Libération depuis les articles émaillés en contact avec les aliments -

Méthode d'essai et limites (ISO 4531:2022)
Ta slovenski standard je istoveten z: EN ISO 4531:2022
ICS:
25.220.50 Emajlne prevleke Enamels
67.250 Materiali in predmeti v stiku z Materials and articles in
živili contact with foodstuffs
97.040.60 Kuhinjska posoda, jedilni Cookware, cutlery and
servisi in jedilni pribor flatware
SIST EN ISO 4531:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 4531:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 25.220.50; 67.250; 97.040.60 Supersedes EN ISO 4531:2018
English Version
Vitreous and porcelain enamels - Release from enamelled
articles in contact with food - Methods of test and limits
(ISO 4531:2022)

Émaux vitrifiés - Libération depuis les articles émaillés Emails - Freisetzung aus emaillierten Gegenständen für

en contact avec les aliments - Méthode d'essai et den Kontakt mit Lebensmitteln - Prüfverfahren und

limites (ISO 4531:2022) zulässige Grenzwerte (ISO 4531:2022)
This European Standard was approved by CEN on 13 April 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 4531:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531:2022 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 4531:2022
EN ISO 4531:2022 (E)
European foreword

This document (EN ISO 4531:2022) 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 November 2022, and conflicting national standards

shall be withdrawn at the latest by November 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 4531:2018.

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 4531:2022 has been approved by CEN as EN ISO 4531:2022 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 4531:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 4531:2022
INTERNATIONAL ISO
STANDARD 4531
Second edition
2022-04
Vitreous and porcelain enamels —
Release from enamelled articles in
contact with food — Methods of test
and limits
Émaux vitrifiés — Libération depuis les articles émaillés en contact
avec les aliments — Méthode d'essai et limites
Reference number
ISO 4531:2022(E)
© ISO 2022
---------------------- Page: 7 ----------------------
SIST EN ISO 4531:2022
ISO 4531:2022(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 4531:2022
ISO 4531:2022(E)
Contents Page

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

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

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

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

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

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

5 Reagents ........................................................................................................................................................................................................................ 2

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

7 Samples .......................................................................................................................................................................................................................... 3

8 Preparation of samples .................................................................................................................................................................................3

9 Test conditions .......................................................................................................................................................................................................4

10 Procedure ....................................................................................................................................................................................................................4

10.1 Release test ................................................................................................................................................................................................ 4

10.1.1 Release test lab apparatus ......................................................................................................................................... 4

10.1.2 Release from enamelled articles .......................................................................................................................... 5

10.2 Sampling the release test solution for analysis (sample measuring solution) ......... ...................... 5

11 Expression of results ....................................................................................................................................................................................... 6

11.1 Reporting ..................................................................................................................................................................................................... 6

11.2 Test report .................................................................................................................................................................................................. 6

Annex A (informative) Explanatory information on release limits ................................................................................... 8

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

iii
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 4531:2022
ISO 4531:2022(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 the European Committee for Standardization (CEN) Technical

Committee CEN/TC 262, Metallic and other inorganic coatings, including for corrosion protection and

corrosion testing of metals and alloys, 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 second edition cancels and replaces the first edition (ISO 4531:2018), which has been technically

revised.
The main changes are as follows:

— the release limit and explanatory information on release limit for aluminium has been updated;

— the Bibliography has been updated;
— the requirement to carry out testing on the same day has been added;
— the requirements of test reports have 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 4531:2022
ISO 4531:2022(E)
Introduction

The release of metal-ions from enamelled articles requires effective means of control to ensure

protection against possible hazards arising from the use of improperly formulated, applied and fired

enamels and/or inorganic decorations on food contact surfaces of enamelled articles used for the

preparation, cooking, serving and storage of foodstuffs.

As a secondary consideration, different requirements from country to country for the control of the

release of ions from the surfaces of enamelled articles present non-tariff barriers to international trade

in these commodities. Accordingly, there is a need to establish internationally accepted methods of

testing enamelled articles for the release of metal-ions.
© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 4531:2022
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SIST EN ISO 4531:2022
INTERNATIONAL STANDARD ISO 4531:2022(E)
Vitreous and porcelain enamels — Release from enamelled
articles in contact with food — Methods of test and limits
1 Scope

This document specifies a simulating method of test for determination of the release of metal-ions from

enamelled articles, which are intended to come into contact with food.

This document also specifies limits for the release of metal-ions from enamelled articles, which are

intended to come into contact with food.

This document is applicable to enamelled articles, including tanks and vessels, which are intended to be

used for the preparation, cooking, serving and storage of food.
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 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3585, Borosilicate glass 3.3 — Properties
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 4788, Laboratory glassware — Graduated measuring cylinders

ISO 28764, Vitreous and porcelain enamels — Production of specimens for testing enamels on sheet steel,

sheet aluminium and cast iron
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:

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

For the release of metal-ions, if present, from the surfaces of articles or test specimen, a mass fraction of

3 % (density) of an acetic acid solution shall be used. Three consecutive release tests shall be performed

on the same day using the same sample and a fresh test solution per test. The first two release test

solutions (M1, M2) are discarded. Only the third release test solution (M3) shall be used for analysis. A

blank test (B1, B2, B3) is required for each release test, of which only the third release test solution (B3)

shall be used for analysis.
© ISO 2022 – All rights reserved
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SIST EN ISO 4531:2022
ISO 4531:2022(E)
5 Reagents

During the determination, use only reagents of recognized analytical grade and only distilled water, or

water of equivalent purity, grade 3 water conforming to the requirements of ISO 3696.

It is permissible to prepare proportionately greater quantities of test solution and analytical solutions

than specified in 5.2.
5.1 Acetic acid, (CH COOH), concentrated, density ρ = 1,05 g/ml.
5.2 Test solution, aceti
...

SLOVENSKI STANDARD
oSIST prEN ISO 4531:2021
01-maj-2021

Steklasti in porcelanski emajli - Sproščanje iz emajliranih delcev v stiku z živili -

Metode preskušanja in mejne vrednosti (ISO/DIS 4531:2021)

Vitreous and porcelain enamels - Release from enamelled articles in contact with food -

Methods of test and limits (ISO/DIS 4531:2021)

Emails - Freisetzung aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln -

Prüfverfahren und zulässige Grenzwerte (ISO/DIS 4531:2021)

Émaux vitrifiés - Libération depuis les articles émaillés en contact avec les aliments -

Méthode d'essai et limites (ISO/DIS 4531:2021)
Ta slovenski standard je istoveten z: prEN ISO 4531
ICS:
25.220.50 Emajlne prevleke Enamels
67.250 Materiali in predmeti v stiku z Materials and articles in
živili contact with foodstuffs
97.040.60 Kuhinjska posoda, jedilni Cookware, cutlery and
servisi in jedilni pribor flatware
oSIST prEN ISO 4531:2021 en,fr,de

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

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oSIST prEN ISO 4531:2021
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oSIST prEN ISO 4531:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4531
ISO/TC 107 Secretariat: KATS
Voting begins on: Voting terminates on:
2021-03-08 2021-05-31
Vitreous and porcelain enamels — Release from enamelled
articles in contact with food — Methods of test and limits

Émaux vitrifiés — Libération depuis les articles émaillés en contact avec les aliments — Méthode d'essai et

limites
ICS: 25.220.50; 67.250; 97.040.60
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 4531:2021(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
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oSIST prEN ISO 4531:2021
ISO/DIS 4531:2021(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
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oSIST prEN ISO 4531:2021
ISO/DIS 4531:2021(E)
Contents Page

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

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

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

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

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

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

5 Reagents ........................................................................................................................................................................................................................ 2

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

7 Samples .......................................................................................................................................................................................................................... 3

8 Preparation of samples.................................................................................................................................................................................. 3

9 Test conditions ....................................................................................................................................................................................................... 4

10 Procedure..................................................................................................................................................................................................................... 4

10.1 Release test................................................................................................................................................................................................. 4

10.1.1 Release test lab apparatus ....................................................................................................................................... 4

10.1.2 Release from enamelled articles ........................................................................................................................ 5

10.2 Sampling the release test solution for analysis (sample measuring solution) ................................ 5

11 Expression of results ........................................................................................................................................................................................ 5

11.1 Reporting ..................................................................................................................................................................................................... 5

11.2 Test report ................................................................................................................................................................................................... 6

Annex A (informative) Explanatory information on release limits ...................................................................................... 8

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

© ISO 2021 – All rights reserved iii
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oSIST prEN ISO 4531:2021
ISO/DIS 4531:2021(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 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 the European Committee for Standardization (CEN) Technical

Committee CEN/TC 262, Metallic and other inorganic coatings, including for corrosion protection and

corrosion testing of metals and alloys, 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 second edition cancels and replaces ISO 4531:2018, which has been technically revised.

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.
iv © ISO 2021 – All rights reserved
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oSIST prEN ISO 4531:2021
ISO/DIS 4531:2021(E)
Introduction

The release of metal-ions from enamelled articles requires effective means of control to ensure

protection against possible hazards arising from the use of improperly formulated, applied and fired

enamels and/or inorganic decorations on the food contact surfaces of enamelled articles used for the

preparation, cooking, serving and storage of foodstuffs.

As a secondary consideration, different requirements from country to country for the control of the

release of ions from the surfaces of enamelled articles present non-tariff barriers to international trade

in these commodities. Accordingly, there is a need to establish internationally accepted methods of

testing enamelled articles for the release of metal-ions.
© ISO 2021 – All rights reserved v
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oSIST prEN ISO 4531:2021
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oSIST prEN ISO 4531:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 4531:2021(E)
Vitreous and porcelain enamels — Release from enamelled
articles in contact with food — Methods of test and limits
1 Scope

This document specifies a simulating method of test for determination of the release of metal-ions from

enamelled articles, which are intended to come into contact with food.

It also specifies limits for the release of metal-ions from enamelled articles, which are intended to come

into contact with food.

It is applicable to enamelled articles, including tanks and vessels, which are intended to be used for the

preparation, cooking, serving and storage of food.
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 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3585, Borosilicate glass 3.3 — Properties
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 4788, Laboratory glassware — Graduated measuring cylinders

ISO 28764, Vitreous and porcelain enamels — Production of specimens for testing enamels on sheet steel,

sheet aluminium and cast iron
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:

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

For the release of metal-ions, if present, from the surfaces of articles or test specimen a mass fraction of

3 % (w/v) acetic acid solution shall be used. Three consecutive release tests shall be performed using

the same sample and a fresh test solution per test. The first two release test solutions (M1, M2) are

discarded. Only the third release test solution (M3) shall be used for analysis. A blank test (B1, B2,

B3) is required for each release test, of which only the third release test solution (B3) shall be used for

analysis.
© ISO 2021 – All rights reserved 1
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oSIST prEN ISO 4531:2021
ISO/DIS 4531:2021(E)
5 Reagents

During the determination, use only reagents of recognized analytical grade and only distilled water, or

water of equivalent purity (grade 3 water conforming to the requirements of ISO 3696).

It is permissible to prepare proportionately greater quantities of test solution and analytical solutions

than specified in 5.2.
5.1 Acetic acid, (CH COOH), concentrated, density ρ = 1,05 g/ml.
5.2 Test solution, acetic acid, a 3 % (w/v) solution.

By means of a graduated measuring cylinder (6.4) add, to 500 ml of water, (30 ± 1) g (28,6 ml) of

concentrated acetic acid (5.1) and make up to 1 l. Prepare the test solution freshly prior to use and in

sufficient quantity to enable the whole of any group of tests and analysis to be completed.

5.3 Analytical stock solutions, the standard stock solutions, or multi-element solutions, used for ICP-

analysis shall be used.

5.4 Dishwashing agent, commercially available, non-acidic manual dishwashing detergent in common

dilution.
6 Apparatus

Use only laboratory glassware, conforming to the requirements of appropriate International Standards,

where they exist, and made of borosilicate glass as specified in ISO 3585.

6.1 ICP spectrometer, with a limit of detection at least six times lower than the release limits in Table 1.

Other analysis equipment that achieves the equivalent performance may also be used (e.g. AAS/GF).

6.2 One-mark volumetric flasks, capacities 100 ml and 1 000 ml, conforming to the requirements

specified for class B or better one-mark volumetric flasks in ISO 1042. Other sizes of one-mark volumetric

flasks may also be required.

6.3 One-mark pipettes, capacities 10 ml and 100 ml, conforming to the requirements specified for

class B or better one-mark pipettes in ISO 648. Other sizes of one-mark pipettes may also be required.

6.4 Graduated measuring cylinders, capacities 50 ml and 500 ml, conforming to the requirements

specified in ISO 4788. Other sizes of graduated measuring cylinders may also be required.

6.5 Vessels, containers, stoppers and connectors shall consist of a material, such as glass or

polytetrafluoroethylene (P
...

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