SIST EN ISO 4531:2018
(Main)Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (ISO 4531:2018)
Vitreous and porcelain enamels - Release from enamelled articles in contact with food - Methods of test and limits (ISO 4531:2018)
ISO 4531 specifies a simulating method of test for determination of the release of metal-ions from enamelled ware, which are intended to come into contact with food (including drinks).
ISO 4531 also specifies permissible limits for the release of metal-ions from enamelled ware, which are intended to come into contact with food (including drinks).
ISO 4531 is applicable to enamelled ware, including tanks and vessels, which are intended to be used for the preparation, cooking, serving and storage of food.
ISO 4531 is applicable to enamelled ware including tanks and vessels which can 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 4531:2018)
Diese Norm legt ein Simulationsprüfverfahren zur Bestimmung der Freisetzung von Metallionen aus emaillierten Gegenständen fest, die für den Kontakt mit Lebensmitteln (einschließlich Getränken) bestimmt sind.
Darüber hinaus legt diese Norm auch die Grenzwerte für die Freisetzung von Metallionen aus emaillierten Gegenständen fest, die für den Kontakt mit Lebensmitteln (einschließlich Getränken) bestimmt sind.
Diese Norm ist für emaillierte Gegenstände anwendbar, einschließlich für Behältnisse und Gefäße, 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 4531:2018)
Le présent document spécifie une méthode d'essai de simulation pour la détermination de la libération d'ions métalliques par les articles émaillés destinés à entrer en contact avec les denrées alimentaires.
Il spécifie également les limites relatives à la libération d'ions métalliques par les articles émaillés destinés à entrer en contact avec les denrées alimentaires.
Il s'applique aux articles émaillés, y compris aux 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 delcev v stiku z živili - Metode preskušanja in mejne vrednosti (ISO 4531:2018)
Standard ISO 4531 določa simulacijsko metodo preskusa za ugotavljanje sproščanja kovinskih ionov iz emajliranih izdelkov, ki prihajajo v stik z živili (vključno s pijačo). Standard ISO 4531 prav tako določa dopustne mejne vrednosti za sproščanje kovinskih ionov iz emajliranih izdelkov, ki prihajajo v stik z živili (vključno s pijačo). Standard ISO 4531 se uporablja za emajlirane izdelke, vključno s cisternami in posodami, ki se uporabljajo za pripravo, kuhanje, serviranje in shranjevanje živil. Standard ISO 4531 se uporablja za emajlirane izdelke, vključno s cisternami in posodami, ki se lahko uporabljajo za pripravo, kuhanje, serviranje in shranjevanje živil.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4531:2018
01-december-2018
6WHNODVWLLQSRUFHODQVNLHPDMOL6SURãþDQMHL]HPDMOLUDQLKGHOFHYYVWLNX]åLYLOL
0HWRGHSUHVNXãDQMDLQPHMQHYUHGQRVWL ,62
Vitreous and porcelain enamels - Release from enamelled articles in contact with food -
Methods of test and limits (ISO 4531:2018)
Emails - Freisetzung aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln -
Prüfverfahren und zulässige Grenzwerte (ISO 4531:2018)
Émaux vitrifiés - Libération depuis les articles émaillés en contact avec les aliments -
Méthode d'essai et limites (ISO 4531:2018)
Ta slovenski standard je istoveten z: EN ISO 4531:2018
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 4531:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4531:2018
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SIST EN ISO 4531:2018
EN ISO 4531
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2018
EUROPÄISCHE NORM
ICS 25.220.50; 67.250; 97.040.60
English Version
Vitreous and porcelain enamels - Release from enamelled
articles in contact with food - Methods of test and limits
(ISO 4531:2018)
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 4531:2018) zulässige Grenzwerte (ISO 4531:2018)
This European Standard was approved by CEN on 31 August 2018.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4531:2018 E
worldwide for CEN national Members.
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SIST EN ISO 4531:2018
EN ISO 4531:2018 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 4531:2018
EN ISO 4531:2018 (E)
European foreword
This document (EN ISO 4531:2018) 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 April 2019, and conflicting national standards shall be
withdrawn at the latest by April 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4531:2018 has been approved by CEN as EN ISO 4531:2018 without any modification.
3
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SIST EN ISO 4531:2018
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SIST EN ISO 4531:2018
INTERNATIONAL ISO
STANDARD 4531
First edition
2018-09
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 4531:2018(E)
©
ISO 2018
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SIST EN ISO 4531:2018
ISO 4531:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 4531:2018
ISO 4531:2018(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 . 3
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 . 7
Bibliography . 9
© ISO 2018 – All rights reserved iii
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SIST EN ISO 4531:2018
ISO 4531:2018(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 first edition cancels and replaces ISO 4531-1:1998 and ISO 4531-2:1998, which have been combined
and 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 2018 – All rights reserved
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SIST EN ISO 4531:2018
ISO 4531:2018(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 2018 – All rights reserved v
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SIST EN ISO 4531:2018
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SIST EN ISO 4531:2018
INTERNATIONAL STANDARD ISO 4531:2018(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 2018 – All rights reserved 1
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SIST EN ISO 4531:2018
ISO 4531:2018(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 conf
...
SLOVENSKI STANDARD
oSIST prEN ISO 4531:2017
01-maj-2017
Steklasti in porcelanski emajli - Migracija iz emajliranih predmetov v stiku z živili -
Metoda preskušanja in dovoljene meje (ISO/DIS 4531:2017)
Vitreous and porcelain enamels - Migration from enamelled ware in contact with food -
Method of test and permissible limits (ISO/DIS 4531:2017)
Emails - Migration aus emaillierten Gegenständen für den Kontakt mit Lebensmitteln -
Prüfverfahren und zulässige Grenzwerte (ISO/DIS 4531:2017)
Émaux vitrifiés - Migration dans les articles émaillés en contact avec les aliments -
Méthode d'essai et limites admissibles (ISO/DIS 4531:2017)
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 4531:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 4531:2017
---------------------- Page: 2 ----------------------
oSIST prEN ISO 4531:2017
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4531
ISO/TC 107 Secretariat: KATS
Voting begins on: Voting terminates on:
2017-03-14 2017-06-05
Vitreous and porcelain enamels — Migration from
enamelled ware in contact with food — Method of test and
permissible limits
Émaux vitrifiés — Migration dans les articles émaillés en contact avec les aliments — Méthode d’essai et
limites admissibles
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 4531:2017(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 2017
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 2
6 Samples . 3
7 Preparation of samples. 4
8 Test Conditions . 4
9 Procedure. 4
9.1 Extraction . 4
9.1.1 Migration lab apparatus . 4
9.1.2 Migration enamelled articles . 5
9.2 Sampling the extract solution for analysis (sample measuring solution) . 6
10 Expression of results . 6
10.1 Reporting . 6
10.2 Test report . 7
Annex A (Informative)Explanatory information on permissible limits . 8
Bibliography .13
© ISO 2017 – All rights reserved iii
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 107.
This international standard cancels and replaces ISO 4531-1:1998 and ISO 4531-2:1998, which have
been combined and technically revised.
iv © ISO 2017 – All rights reserved
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
Introduction
The migration of metal-ions from enamelled ware requires effective means of control to ensure the
protection of the population 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 ware
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 toxic materials from the surfaces of enamelled ware present non-tarif barriers to international
trade in these commodities. Accordingly, there is a need to establish internationally accepted methods
of testing enamelled ware for the release of metal-ions.
The amount of metal-ions determined by the method of test specified in this standard will not be higher
than the quantities contained in foods and drinks anyway.
© ISO 2017 – All rights reserved v
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oSIST prEN ISO 4531:2017
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oSIST prEN ISO 4531:2017
DRAFT INTERNATIONAL STANDARD ISO/DIS 4531:2017(E)
Vitreous and porcelain enamels — Migration from
enamelled ware in contact with food — Method of test and
permissible limits
1 Scope
This standard specifies a simulating method of test for determination of the release of metal-ions from
enamelled ware, which are intended to come into contact with food (including drinks).
This standard also specifies permissible limits for the release of metal-ions from enamelled ware,
which are intended to come into contact with food (including drinks).
This standard is applicable to enamelled ware, 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, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 Principle
To extract metal-ions, if present, from the surfaces of articles or test specimen a 3 % (V/V) acetic
solution shall be used. Three successive migrations shall be performed using the same sample and a
fresh test solution per migration. The first two migration solutions (M1, M2) will be discarded, only the
third migration solution (M3) shall be used for analysis. A blank test (B1, B2 & B3) is required for each
migration, of which only the third migration solution (B3) shall be used for analysis.
4 Reagents
During the determination, use only reagents of recognized analytical grade and only distilled water, or
water of equivalent purity (grade 3 water complying with the requirements of ISO 3696). The electrical
conductivity of the water shall be in between of 1 and 5 µS/cm.
The usage of ultrapure water having an electrical conductivity <1 µS/cm is forbidden, because it will
cause an osmotically dissolving of the enamel coat leading to wrong results.
It is permissible to prepare proportionately greater quantities of test solution and analytical solutions
than specified in 4.2.
© ISO 2017 – All rights reserved 1
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
4.1 Acetic acid, (CH COOH), concentrated, density r = 1,05 g/ml.
3
4.2 Test solution, acetic acid, 3 % (V/V) solution.
By means of a graduated measuring cylinder (5.4) add, to 500 ml of water, (30 ± 1) ml of concentrated
acetic acid (4.1) 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.
4.3 Analytical stock solutions, the standard stock solutions, or multi-element solutions, used for ICP-
Analysis shall be used.
4.4 Dishwashing agent, commercially available non-acidic manual dishwashing detergent in common
dilution.
5 Apparatus
Use only laboratory glassware, complying with the requirements of appropriate International
Standards, where they exist, and made of borosilicate glass as specified in ISO 3585.
5.1 ICP spectrometer, with a detection limit equal to or smaller than the values in table 1.
Table 1 — minimum detections limits for the ICP spectrometer
Detection limit
Element
µg/l
Ag 1
Ba 0,15
Cd 0,5
Co 1,2
Cr 1
Cu 1,5
Li 1
Mn 0,15
Mo 2
Ni 2,1
Pb 8
Sb 3
V 2
Zn 0,8
The elements arsenic, thallium, beryllium, and mercury shall not be used in vitreous enamelled
products that are intended to be used in contact with food.
5.2 One-mark volumetric flasks, capacities 100 ml and 1 000 ml, complying with 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.
5.3 One-mark pipettes, capacities 10 ml and 100 ml, complying with the requirements specified for
class B or better one-mark pipettes in ISO 648. Other sizes of one-mark pipettes may also be required.
5.4 Graduated measuring cylinders, capacities 50 ml and 500 ml, complying with the requirements
specified in ISO 4788. Other sizes of graduated measuring cylinders may also be required.
2 © ISO 2017 – All rights reserved
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
5.5 Vessels, containers, stoppers and connectors shall consist of a material, such as glass, PTFE or
stainless steel, that is inert under the specified test conditions.
The material PTFE should only be used when there is a small contact area with the test water. Thus
PTFE is unsuitable for containers.
5.6 Vessels made of borosilicateglass, according to ISO 3585, internal diameter 80 mm, external
diameter 90 mm, hight 36 mm, 10 mm diameter of the filling hole.
The calaculation of the surface/ volume (S/V) ratio is reported below.
The test plate per chamber has a diameter of 80 mm. Therefore the tested area a of one test plate is
2 2
5025 mm ( a= π r ).
The volume of the chamber V with a height h of 36 mm and a gasket thickness t of 2 mm is calculated
from equation (1).
Vh=+2⋅ta⋅ (1)
()
23
Vm=+36 mm22⋅ mm⋅=5025 m 201000mm
()
The surface/ volume ratio can be calculated from equation (2).
a
r = (2)
V
2
5025mm
−1
r ==0,025mm
3
201000mm
2
NOTE This the surface/ volume-ratio as requested in clause 3: 1 l per 2,5 dm .
5.7 Siliconic gaskets, internal diameter 80 mm, external diameter min. 90 mm, thickness 2mm.
5.8 Silicon stoppers, diameter 10 mm, 20 mm length.
5.9 PTFE-thermo insulating plate, dimension min.: 105 mm × 105 mm, 2 mm thickness.
5.10 Blank samples plate made of borosilicate glass, according to ISO 3585 and dimensions min.:
105 mm × 105 mm, 2 mm thickness.
5.11 Flange frame, corrosion resistant steel.
5.12 Heating apparatus, able to support the migration temperature, e.g. (95 ± 2) °C .
5.13 Beaker to preheat the test solution made of borosilicate glass, min. 600 ml volume. The Beaker is
also used as a blank sample container when testing articles.
5.14 Boro-silicate glass lid, according to ISO 3585.
6 Samples
The laboratory sample shall consist of two similar single articles, identical in material, shape,
dimensions and decoration. The sample may be specifically produced test plates or actual industrially
produced articles.
© ISO 2017 – All rights reserved 3
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oSIST prEN ISO 4531:2017
ISO/DIS 4531:2017(E)
For testing vitreous and porcelain enamelled tanks and vessels, test specimens prepared in accordance
with ISO 28764 shall be used. These test specimens shall be tested as flat ware.
7 Preparation of samples
Wash the samples briefly in an aqueous solution at 40 °C ± 5 °C containing 1 ml/l of dishwashing agent
(4.4). Rinse the samples thoroughly with tap water, then with distilled water and allow to drain. Wipe
dry with clean filter paper. Do not use any sample which shows residual staining.
Do not handle the surface to be tested after it has been cleaned or prepared.
8 Test Conditions
For enamelled surfaces that are used at room temperature only the test conditions shall be 24 h at
(40 ± 2) °C
For enamelled surfaces that are used for hot fills the test conditions shall be 2 h at (70 ± 2) °C.
For enamelled surfaces used for grills and barbecues due to the short exposure time the test condition
shall be 30 min. at (95 ± 2) °C.
For enamelled surfaces that are used for high temperature applications, including cooking, the test
conditions shall be 2 h at (95 ± 2) °C.
Where tests are performed using the 2 h at 95 °C condition there shall be no requirement to perform
tests at other conditions specified as the 2 h at 95 °C condition is the most severe.
The use of 95 °C instead of boiling conditions is specified to eliminate variability that is caused by
atmospheric and other influences on the boiling conditions.
...
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