SIST EN ISO 6427:2025

SLOVENSKI STANDARD
01-september-2025
Polimerni materiali - Določanje snovi, ki se izločijo z ekstrakcijo z organskimi topili
(klasične metode) (ISO 6427:2025)
Plastics - Determination of matter extractable by organic solvents (conventional
methods) (ISO 6427:2025)
Kunststoffe - Bestimmung der extrahierbaren Bestandteile durch organische Lösemittel
(Standardverfahren) (ISO 6427:2025)
Plastiques - Détermination des matières extractibles par des solvants organiques
(Méthodes conventionnelles) (ISO 6427:2025)
Ta slovenski standard je istoveten z: EN ISO 6427:2025
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6427
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 6427:2014
English Version
Plastics - Determination of matter extractable by organic
solvents (conventional methods) (ISO 6427:2025)
Plastiques - Détermination des matières extractibles Kunststoffe - Bestimmung der extrahierbaren
par des solvants organiques (Méthodes Bestandteile durch organische Lösemittel
conventionnelles) (ISO 6427:2025) (Standardverfahren) (ISO 6427:2025)
This European Standard was approved by CEN on 17 July 2025.

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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6427:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6427:2025) has been prepared by Technical Committee ISO/TC 61 "Plastics " in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by SIS.
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 January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
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 6427:2014.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 6427:2025 has been approved by CEN as EN ISO 6427:2025 without any modification.

International
Standard
ISO 6427
Fourth edition
Plastics — Determination of matter
2025-07
extractable by organic solvents
(conventional methods)
Plastiques — Détermination des matières extractibles par des
solvants organiques (Méthodes conventionnelles)
Reference number
ISO 6427:2025(en) © ISO 2025
ISO 6427:2025(en)
© ISO 2025
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 6427:2025(en)
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
ISO 6427:2025(en)
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
ISO 6427:2025(en)
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
International Standard ISO 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/

ISO 6427:2025(en)
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).
ISO 6427:2025(en)
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 or other sample
containers
5.10 Distillation equipment.
One of the following devices shall be used:
5.10.1 Rotary evaporator.
5.10.2 Distillation apparatus, fitted with a Vigreux or equivalent distillation column of length at least 400 mm.

ISO 6427:2025(en)
5.11 Vacuum oven or oven with fresh air circulation, explosion-proof and capable of maintaining the
required test temperature with an accuracy of ±2 °K.
5.12 Evaporating dish, of suitable capacity, for example 200 ml.
Dimensions in millimetres
Key
1 45/40 ground-glass socket
2 vacuum jacket
3 29/32 ground-glass cone
Figure 2 — Extractor of Twisselmann type with vacuum jacket
6 Preparation of test sample
6.1 The plastics material or plastics product shall be free of dust and foreign matter.
6.2 The sample of plastic shall be reduced to small pieces, for example by grinding in a suitable mill (5.1),
but shall not be heated more than necessary. In some cases, it may be necessary to add solid carbon dioxide
to prevent heat build-up during grinding. The reduction in size may also be done by the use of a razor blade
or a pair of scissors, or a file for hard materials. The portion of the sample of specified granular size (see
Table 1) shall be kept in a closed bottle until tested. Films with a thickness
...