SIST EN ISO 4531:2022
(Main)Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (ISO 4531:2022)
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 legt dieses Dokument auch Grenzwerte für die Freisetzung von Metallionen aus emaillierten Gegenständen fest, die für den Kontakt mit Lebensmitteln bestimmt sind.
Dieses Dokument 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
- Technical Committee
- IPKZ - Protection of metals against corrosion
- Current Stage
- 8100 - Objava popravka objave (Adopted Project 1)
- Start Date
- 25-Jul-2022
- Due Date
- 16-Aug-2022
- Completion Date
- 16-Aug-2022
Relations
- Effective Date
- 11-May-2022
- Effective Date
- 05-Feb-2025
- Effective Date
- 01-May-2021
Overview
EN ISO 4531:2022 - "Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits" is a CEN‑adopted ISO standard that defines a simulated test method and specifies limits for the release of metal ions from enamelled surfaces intended to contact food. It applies to enamelled articles including cookware, tanks and vessels used for preparation, cooking, serving and storage of food. The standard supersedes EN ISO 4531:2018 and includes updates such as revised guidance on aluminium release and a testing-timing requirement.
Key topics and requirements
- Test principle: Simulated food‑contact testing using a 3% (by mass/density) acetic acid solution to provoke release of metal ions from enamelled surfaces.
- Three-step test cycle: Perform three consecutive release tests on the same day with fresh test solution for each test. Discard the first two solutions (M1, M2) and analyse only the third solution (M3). Corresponding blanks (B1–B3) are required; only B3 is analysed.
- Analytical methods: Use ICP spectrometry (or equivalent such as AAS/GF) with a limit of detection at least six times lower than the release limits specified in the standard.
- Reagents and materials: Use analytical-grade reagents and grade‑3 water (ISO 3696). Test solution preparation: add specified quantity of concentrated acetic acid to water to make a 3% solution; prepare freshly before testing.
- Apparatus and sample prep: Use borosilicate glassware conforming to ISO glassware standards (ISO 3585, ISO 1042, ISO 648, ISO 4788). Specimen preparation references (ISO 28764) are cited for enamel specimens on sheet metal.
- Reporting: The standard defines required test-report content and requires same‑day completion of the group of tests and analyses.
Applications and users
Who uses EN ISO 4531:2022:
- Manufacturers of enamelled cookware, kitchenware, tanks, and food‑processing vessels (product compliance and quality control).
- Testing laboratories performing food contact material testing and certification.
- Regulatory authorities and market surveillance for food safety and import/export compliance.
- Procurement and QA teams in food industry and catering specifying safe materials for equipment and storage. Practical benefits: provides harmonized, internationally accepted test methods and limits to reduce food‑safety risks and non‑tariff trade barriers for enamelled products.
Related standards
- ISO 28764 - Production of specimens for testing enamels on sheet steel, aluminium and cast iron
- ISO 3696 - Water for analytical laboratory use
- ISO 1042, ISO 648, ISO 4788 - Laboratory glassware standards
- Other analytical method standards for ICP/AAS instrumentation
Keywords: EN ISO 4531:2022, vitreous and porcelain enamels, release from enamelled articles, metal-ion release, food contact testing, enamelled cookware, test methods and limits.
Frequently Asked Questions
SIST EN ISO 4531:2022 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (ISO 4531:2022)". This standard covers: 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.
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.
SIST EN ISO 4531:2022 is classified under the following ICS (International Classification for Standards) categories: 25.220.50 - Enamels; 67.250 - Materials and articles in contact with foodstuffs; 97.040.60 - Cookware, cutlery and flatware. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 4531:2022 has the following relationships with other standards: It is inter standard links to SIST EN ISO 4531:2018, oSIST prEN ISO 4531:2025, SIST EN ISO 4531:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN ISO 4531:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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.
Contents Page
European foreword . 3
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.
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 4531:2022(E)
© 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
ii
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 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.
iv
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.
v
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 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
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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.
Contents Page
European foreword . 3
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.
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 4531:2022(E)
© 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
ii
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 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.
iv
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.
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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 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
...
기사 제목 : SIST EN ISO 4531:2022 - 유리 및 도기 에나멜 - 식품과 접촉하는 에나멜 제품에서의 이온 누설 - 시험 방법과 한도 (ISO 4531:2022) 기사 내용: 이 문서는 식품과 접촉하기 위해 설계된 에나멜 제품에서 금속 이온 누설을 확인하기 위한 시험 방법을 정하는 것을 명시합니다. 이 문서는 또한 식품과 접촉하는 에나멜 제품에서 금속 이온의 누설에 대한 한도를 명시합니다. 이 문서는 음식의 준비, 조리, 서빙 및 저장을 위해 사용되는 탱크와 용기를 비롯한 에나멜 제품에 적용됩니다.
기사 제목: SIST EN ISO 4531:2022 - 유리 및 프로세린 안료 - 식품과 접촉한 커버에 의한 물질 방출 - 시험 및 한계치 방법 (ISO 4531:2022) 기사 내용: 본 문서는 식품과 접촉할 목적으로 하는 유리 및 프로세린 안료로 물질 방출에 대한 시험 방법을 제시한다. 또한, 본 문서는 식품과 접촉할 목적으로 하는 유리 및 프로세린 안료로 물질 방출의 한계치를 제시한다. 이 문서는 식품의 준비, 조리, 제공 및 저장을 위해 사용되는 탱크와 용기 등을 포함한 유리 및 프로세린 안료에 적용된다.
記事タイトル：SIST EN ISO 4531:2022 - ガラスおよび磁器エナメル - 食品と接触したエナメル製品からの物質放出 - 試験および制限方法（ISO 4531:2022） 記事内容：本文書は、食品と接触することを意図したエナメル製品からの金属イオンの放出を測定するためのシミュレーション方法の指定を行います。これに加えて、食品と接触することを意図したエナメル製品からの金属イオンの放出に対する制限を指定します。本文書は、食品の準備、調理、提供、保存に使用されるタンクや容器など、エナメル製品に適用されます。
記事タイトル：SIST EN ISO 4531:2022 - ガラスおよび磁器のエナメル - 食品と接触するエナメル製品からの金属イオンの放出 - 試験方法と限界（ISO 4531:2022） 記事内容：このドキュメントでは、食品と接触するエナメル製品からの金属イオンの放出を測定するためのシミュレーション方法の規定について説明しています。 また、食品と接触するエナメル製品からの金属イオンの放出に対する限界値も規定しています。 このドキュメントは、食品の準備、調理、給仕、保存に使用されるタンクや容器を含む、エナメル製品に適用されます。
The article discusses the SIST EN ISO 4531:2022 standard, which focuses on testing and setting limits for the release of metal-ions from enamelled articles that come into contact with food. The standard applies to various enamelled items, such as tanks and vessels used for food preparation, cooking, serving, and storage.
The article discusses SIST EN ISO 4531:2022, which is a standard that specifically addresses the release of metal-ions from enamelled articles in contact with food. The document outlines a method of testing for the determination of such releases and sets limits for the permissible amounts of metal-ions that can be released. It applies to various enamelled articles used in food preparation, cooking, serving, and storage, including tanks and vessels.
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