ISO/FDIS 1158

Plastics — Vinyl chloride homopolymers and copolymers — Determination of chlorine content

Plastiques — Homopolymères et copolymères de chlorure de vinyle — Dosage du chlore

General Information

• Status: Not Published
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: ISO/TC 61/SC 9 - Thermoplastic materials
• Drafting Committee: ISO/TC 61/SC 9/WG 20 - Poly(vinyl chloride)
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 08-Dec-2025
• Completion Date: 08-Dec-2025

Relations

• Consolidates: ISO 22553-13:2021 - Paints and varnishes — Electro-deposition coatings — Part 13: Determination of re-solving behaviour
• Effective Date: 18-Nov-2023
• Revises: ISO 1158:1998 - Plastics — Vinyl chloride homopolymers and copolymers — Determination of chlorine content
• Effective Date: 04-Nov-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 61/SC 9
Plastics — Vinyl chloride
Secretariat: KATS
homopolymers and copolymers —
Voting begins on:
Determination of chlorine content
2025-12-08
Plastiques — Homopolymères et copolymères de chlorure de
Voting terminates on:
vinyle — Dosage du chlore
2026-02-02
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.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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 9
Plastics — Vinyl chloride
Secretariat: KATS
homopolymers and copolymers —
Voting begins on:
Determination of chlorine content
Plastiques — Homopolymères et copolymères de chlorure de
Voting terminates on:
vinyle — Dosage du chlore
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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Test sample . 4
8 Procedure . 5
8.1 Method A — Combustion bomb . .5
8.2 Method B — Oxygen flask .5
9 Expression of results . 7
10 Precision . 7
11 Test report . 7

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 document 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 9, Thermoplastics
materials, 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 1158:1998), which has been technically
revised.
The main changes are as follows:
— the mandatory normative references clause has been added (see Clause 2);
— the mandatory terms and definitions clauses has been added (see Clause 3)
— the unit of concentration of nitric acid solution has been changed, and a preparation method has been
added (see 5.3);
— a method for determining the endpoint of titration by potentiometric titration has been added (see
8.1.6, 8.2.5);
— the preparation method of potassium hydroxide solution has been added (see 5.5.3);
— the requirements of filter paper have been changed (see 6.5.2);
— the test procedure for collecting the combustion-based liquid and the amount of liquid collected in
method B have been changed (see 8.2.5);
— the tolerances of the method have been changed (see 9.2).
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
FINAL DRAFT International Standard ISO/FDIS 1158:2025(en)
Plastics — Vinyl chloride homopolymers and copolymers —
Determination of chlorine content
WARNING — All precautions in this document shall be taken to protect operators from risks
presented by both methods.
1 Scope
This document specifies two methods for the determination of the chlorine content of homopolymers and
copolymers of vinyl chloride, free from plasticizers or additives, namely:
— method A (combustion in a bomb);
— method B (combustion in a flask).
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 3696, Water for analytical laboratory use — Specification and test methods
ISO 6353-1, Reagents for chemical analysis — Part 1: General test methods
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
...

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ISO /TC 61/SC 9/WG 20
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Secretariat: KATS
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Date: 2025-7-811-24
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Plastics- — Vinyl chloride homopolymers and copolymers- —
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Determination of chlorine content .

Plastiques — Homopolymères et copolymères de chlorure de vinyle — Dosage du chlore
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This document is not an ISO International Standard. It is distributed for review and comment. It is subject to
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Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of
IISOSO/CE/CEN PN PARARAALLLLEEL PL PRROOCCEESSSISINGNG
which they are aware and to provide supporting documentation.

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© ISO #### – All rights reserved

ISO #####-#:####(X)
A model manuscript of a draft International Standard (known as “The Rice Model”) is available at
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
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or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO 0 pt, Header distance from edge: 36 pt, Footer
at the address below or ISO’s member body in the country of the requester. distance from edge: 14.15 pt
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ISO copyright office
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CP 401 • Ch. de Blandonnet 8
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CH-1214 Vernier, Geneva
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Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
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Website: www.iso.orgwww.iso.org
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Published in Switzerland
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iv © ISO #### 2025 – All rights reserved
iv
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Contents
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Foreword . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Test sample . 5
8 Procedure . 5
9 Expression of results . 8
10 Precision . 8
11 Test report . 9

This template allows you to work with default MS Word functions and styles. You can use these if you want to
maintain the Table of Contents automatically and apply auto-numbering.
To update the Table of Contents please select it and press "F9".
Foreword . iv
—Added the Normative references(s Added the Terms and definitions ee 2) ; . iv
—Added the Terms and definitions(see 3) . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Test sample . 3
8 Procedure . 3
9 Expression of results . 5
10 Precision . 5
11 Test report . 5
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© ISO #### 2025 – All rights reserved
v
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Foreword
spacing: single
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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 documentsdocument 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 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.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastics
Materials.materials, 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 1158:19881998), which has been technically
revised.
The main changes are as follows:
—Changed the scope of application of the document(see Clause 1);
—Added the Normative references(see Clause 2) ;
—Added the Terms and definitions(see Clause 3)
— —Changed the mandatory normative references clause has been added (see Clause 2);
— the mandatory terms and definitions clauses has been added (see Clause 3)
Formatted: Font: 10 pt
— the unit of concentration of nitric acid solution has been changed, and addeda preparation method(see
5.3); has been added (see 5.3);
Formatted: Font: 10 pt
Formatted: Font: 11 pt
— —Added a method for determining the endpoint of titration by potentiometric titration(see 8.1.6,8.2.5);
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has been added (see 8.1.6, 8.2.5);
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vi © ISO #### 2025 – All rights reserved
vi
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— —Thethe preparation method of potassium hydroxide solution has been added (see 5.8);5.5.3);
Line spacing: single
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— —Changed the requirements of filter paper (see 6.9);have been changed (see 6.5.2);
— —Changed the test procedure for collecting the combustion-based liquid and the amount of liquid
collected in method B(see 8.2.5); have been changed (see 8.2.5);
— —Changed the tolerances of the method have been changed (see 9.2);9.2).
A list of all parts in the ISO ##### series can be found on the ISO website.
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.htmlwww.iso.org/members.html.

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© ISO #### 2025 – All rights reserved
vii
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Plastics- — Vinyl chloride homopolymers and copolymers- —
Determination of chlorine content
WARNING— — All precautions in this document shall be taken, particularly those mentioned in the text of
Formatted
...
the present International Standard, to protect operators from risks presented by both methods.
1 Scope
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This document specifies two methods for the determination of the chlorine content of homopolymers and
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copolymers of vinyl chloride, free from plasticizers or additives, namely:
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— method A（ (combustion in a bomb）;);
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— method B（ (combustion in a flask).
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2 Normative references
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The following documents are referred to in the text in such a way that some or all of their content constitutes
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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.
Formatted
...
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ISO 3696, Water for analytical laboratory use — Specification and test methods
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ISO 6353--1, Reagents for chemical analysis — Part 1: General test methods
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3 Terms and definitions
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