oSIST prEN ISO 4531:2021
(Main)Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (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)
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/DIS 4531:2021)
Steklasti in porcelanski emajli - Sproščanje iz emajliranih delcev v stiku z živili - Metode preskušanja in mejne vrednosti (ISO/DIS 4531:2021)
General Information
RELATIONS
Standards Content (sample)
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
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
limitesICS: 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
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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
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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 pipettesISO 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 iron3 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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