ISO/FDIS 6427
(Main)Plastics — Determination of matter extractable by organic solvents (conventional methods)
Plastics — Determination of matter extractable by organic solvents (conventional methods)
ISO 6427:2013 specifies methods for the determination of components in plastics that can be extracted by hot organic liquids near their boiling points. For one special case, a so-called cold-extraction method is given. The extractable components can be monomers, oligomers, polymers, plasticizers, stabilizers, etc. The kind and percentage of extractable matter influence the properties of plastics. The recommended extraction liquid depends on the type of plastic and on the purpose of the determination. The extracted amounts of special constituents are often not quantitative in the sense of analytical chemistry.
Plastiques — Détermination des matières extractibles par des solvants organiques (Méthodes conventionnelles)
L'ISO 6427:2013 spécifie des méthodes pour la détermination des composants dans les plastiques pouvant être extraits au moyen de liquides organiques chauds près de leurs points d'ébullition. Pour une utilisation spéciale, une méthode d'extraction froide est spécifiée. Les composants extractibles peuvent être des monomères, des oligomères, des polymères, des plastifiants, des stabilisants, etc. La nature et le pourcentage de la matière extractible ont une influence sur les propriétés des plastiques. Le liquide d'extraction recommandé dépend du type de plastique mis en présence ainsi que du but de la détermination. Les quantités de composants spéciaux extraites sont souvent non quantitatives dans le sens de la chimie analytique.
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FINAL DRAFT
International
Standard
ISO/TC 61/SC 5
Plastics — Determination of matter
Secretariat: DIN
extractable by organic solvents
Voting begins on:
(conventional methods)
2025-04-21
Plastiques — Détermination des matières extractibles par des
Voting terminates on:
solvants organiques (Méthodes conventionnelles)
2025-06-16
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
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INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 61/SC 5
Plastics — Determination of matter
Secretariat: DIN
extractable by organic solvents
Voting begins on:
(conventional methods)
Plastiques — Détermination des matières extractibles par des
Voting terminates on:
solvants organiques (Méthodes conventionnelles)
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reagents and materials . 2
5 Apparatus . 2
6 Preparation of test sample . 4
7 Number of tests . 4
8 Procedure . 5
9 Expression of results . 5
10 Precision . 6
11 Test report . 6
Annex A (normative) Procedure for casting, drying, and cutting films of cellulose acetate .10
Annex B (normative) Determination of solubility of polypropylene in cold p‑xylene .11
Bibliography . 14
iii
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 6427:2013), which has been technically
revised.
The main changes are as follows:
— the mandatory terms and definitions clause (Clause 3) has been added, and subsequent clauses have
been renumbered;
— tolerances of all relevant test parameters have been added;
— the test report has been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
There are several very similar national and international standards for the determination of the percentage
of extractable matter, with only slight differences in the procedures. To facilitate the work of the laboratory
staff which has to carry out these determinations on various plastics products, the generally applicable
methods are specified in this document.
v
FINAL DRAFT International Standard ISO/FDIS 6427:2025(en)
Plastics — Determination of matter extractable by organic
solvents (conventional methods)
1 Scope
This document specifies methods for the determination of components in plastics that can be extracted
by hot organic liquids near their boiling points. It also specifies a special extraction method called cold-
extraction.
The extractable components can be monomers, oligomers, polymers, plasticizers, stabilizers, etc. The kind
and percentage of extractable matter influence the properties of plastics.
This document does not apply to plastics that come into contact with food or drinking water, because special
regulations for those plastics are established in many countries. The methods of this document are not
intended to be used for migration tests.
If this document is used to test plastics other than those mentioned in Table 1, the operating conditions are
intended to be agreed upon by the interested parties.
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 308, Plastics — Phenolic moulding materials — Determination of acetone-soluble matter (apparent resin
content of material in the unmoulded state)
ISO 383, Laboratory glassware — Interchangeable conical ground joints
ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of
openings
ISO 1773, Laboratory glassware — Narrow-necked boiling flasks
ISO 1875, Plastics — Plasticized cellulose acetate — Determination of matter extractable by diethyl ether
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Reagents and materials
4.1 Extraction liquid, of AR grade and higher grade, to be selected according to the requirements of the
plastic material being tested (according to Table 1).
The recommended extraction liquid depends on the type of plastic and on the purpose of the determination
(according to Table 1). The extracted amounts of special constituents are often not quantitative in the sense
of analytical chemistry.
4.2 Anti‑bumping granules.
4.3 Glass wool, pre‑extracted.
5 Apparatus
5.1 Mill, for reducing the sample to the required grain size.
A mill in which the sample is cut between rotating and stationary blades is preferred. Large pieces can be
reduced in size with a pair of shears or cutting pliers before they are fed into the mill.
5.2 Set of sieves, in accordance with the requirements of ISO 565.
5.3 Flask, of suitable capacity, for example 250 ml, in accordance with the requirements of ISO 1773, with
ground-glass neck in accordance with the requirements of ISO 383.
5.4 Extraction apparatus, of such a design that the crucible or thimble is heated by the rising vapour of
the extraction liquid.
5.4.1 Soxhlet extractor, as shown in Figure 1.
5.4.2 Other extractors, for example that designed by Twisselmann (see Figure 2), may be used, if they
give the same results as the Soxhlet extractor.
5.5 Container, for the test portion to be extracted: chosen from one of the following:
5.5.1 Cellulose paper thimble, of suitable size, for example diameter 33 mm and length 94 mm.
5.5.2 Metal wire basket, of the same dimensions as the thimble (5.5.1).
5.5.3 Glass-filter crucible, pore size 40 μm to 100 μm.
IMPORTANT — The choice of a suitable container for the extraction is very important. The mass of
the cellulose thimble (5.5.1) depends on its moisture content, and this can lead to variable results
when weighing. The metal wire basket (5.5.2) cannot be used with a powder sample or if a chemical
reaction is possible between the metal and any of the components of the plastic. Difficulties can be
caused by penetration of components of the plastic into the pores of the glass-filter crucible (5.5.3)
and subsequent swelling.
5.6 Reflux condenser, fitted with a ground-glass cone to fit the extraction apparatus (5.4), for example a
Dimroth condenser.
5.7 Heating device, which does not use a naked flame and is explosion-proof, suitable for use with the
flask (5.3).
5.8 Balance, accurate to 0,1 mg, with a maximum load specification above 200 g.
5.9 Desiccator, containing calcium chloride or silica gel.
Dimensions in millimetres
Key
1 extractor trap (5.4)
2 thimble (5.5.1)
3 flask (5.3)
4 heater (5.7)
Figure 1 — Soxhlet type extraction apparatus capable of receiving the thimble o
...
Style Definition
ISO/FDIS 6427:2025(E)
...
Formatted: French (Switzerland)
ISO /TC 61/SC 5/WG 11
Formatted: Right: 1.5 cm, Bottom: 1 cm, Gutter: 0 cm,
Section start: New page, Header distance from edge:
Date: 2025-02
1.27 cm, Footer distance from edge: 1.27 cm
Formatted
Secretariat: DIN
...
Formatted: zzCover large
Date: 2025-04-07
Formatted
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Formatted: Cover Title_A1
Plastics — Determination of matter extractable by organic solvents
(conventional methods)
Plastiques — Détermination des matières extractibles par des solvants organiques (Méthodes conventionnelles)
Formatted: French (France)
Formatted: Cover Title_B, Adjust space between Latin
and Asian text, Adjust space between Asian text and
numbers
FDIS stage
Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: Bold
Formatted: HeaderCentered
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication Formatted: Default Paragraph Font
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
Formatted: French (Switzerland)
EmailE-mail: copyright@iso.org
Formatted: French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland
Formatted: English (United Kingdom)
Formatted: English (United Kingdom)
Formatted: FooterPageRomanNumber
ii © ISO 2023 – All rights reserved
ii
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Formatted: HeaderCentered, Left
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Contents
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Foreword . v
Adjust space between Asian text and numbers
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reagents and materials . 2
5 Apparatus . 2
6 Preparation of test sample . 7
7 Number of tests . 7
8 Procedure . 7
9 Expression of results . 8
10 Precision . 8
11 Test report . 9
Annex A (normative) Procedure for casting, drying, and cutting films of cellulose acetate . 14
Annex B (normative) Determination of solubility of polypropylene in cold p‑xylene . 17
Bibliography . 21
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reagents and materials . 1
5 Apparatus . 2
6 Preparation of test sample . 4
7 Number of tests . 4
8 Procedure . 4
9 Expression of results . 5
10 Precision . 6
11 Test report . 6
Annex A (normative) Procedure for casting, drying, and cutting films of cellulose acetate . 11
A.1 Gerneral . 11
Annex B (normative) Determination of solubility of polypropylene in cold p-xylene . 12
B.1 General . 12
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iii
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B.2 Definition . 12
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B.3 Apparatus . 12
B.4 Procedure . 13
B.5 Expression of results . 13
B.6 Test report . 14
Bibliography . 15
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iv © ISO 2023 – All rights reserved
iv
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Formatted: HeaderCentered, Left
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Foreword
Formatted: Font: 11 pt, Bold, Font color: Auto
ISO (the International Organization for Standardization) is a worldwide federation of national standards Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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).
Formatted: English (United Kingdom)
Field Code Changed
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
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.
Field Code Changed
Formatted: English (United Kingdom)
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties, in collaboration with the European Committee for Standardization (CEN) Technical
Formatted: Font: Not Italic
Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO
Formatted: Font: Not Italic
and CEN (Vienna Agreement).
Formatted: Font: Not Italic
This fourth edition cancels and replaces the third edition (ISO 6427:2013), which has been technically revised.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
The main changes are as follows:
Formatted: Default Paragraph Font
— update of normative references; Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
— — addition of the mandatory terms and definitions clause (3) has been added, and subsequent clauses
have been renumbered;
— tolerances of all relevant test parameters have been added;
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
— — completion ofthe test report has been updated.
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: Adjust space between Latin and Asian text,
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
Adjust space between Asian text and numbers
Formatted: FooterPageRomanNumber
v
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Formatted: Font: Bold
Formatted: HeaderCentered
Introduction
Formatted: Font: 11 pt, Bold, Font color: Auto
There are several very similar national and international standards for the determination of the percentage of
extractable matter, with only slight differences in the procedures. To facilitate the work of the laboratory staff
which has to carry out these determinations on various plastics products, the generally applicable methods
are specified in this document.
Formatted: FooterPageRomanNumber
vi © ISO 2023 – All rights reserved
vi
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6427:2025(E)
Formatted: Main Title 1, Space After: 0 pt, Adjust space
Plastics — Determination of matter extractable by organic solvents
between Latin and Asian text, Adjust space between
(conventional methods)
Asian text and numbers
1 Scope
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
This document specifies methods for the determination of components in plastics that can be extracted by hot
organic liquids near their boiling points. Annex BIt also specifies a special extraction method called cold-
extraction.
The extractable components can be monomers, oligomers, polymers, plasticizers, stabilizers, etc. The kind and
percentage of extractable matter influence the properties of plastics.
This document does not apply to plastics that come into contact with food or drinking water, because special
regul
...
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