EN ISO 1158:1998

Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine content (ISO 1158:1998)

Kunststoffe - Vinylchloridhomopolymere und Copolymere - Bestimmung des Chlorgehalts (ISO 1158:1998)

Diese Internationale Norm befaßt sich mit zwei Verfahren zur Bestimmung des Chlors in Homopolymeren und Copolymeren des Vinylchlorids in Abwesenheit von Weichmachern oder Additiven: - Verfahren A (Verbrennen in einer Bombe); - Verfahren B (Verbrennen in einem Glaskolben). Warnung: Alle Vorsichtsmaßnahmen müssen getroffen werden, besonders die im Text dieser Internationalen Norm angegebenen, um die Ausführenden vor den Risiken beider Verfahren zu schützen.

Plastiques - Homopolymères et copolymères de chlorure de vinyle - Dosage du chlore (ISO 1158:1998)

Polimerni materiali - Homo- in kopolimeri vinilklorida - Določevanje klora (ISO 1158:1998)

General Information

• Status: Published
• Publication Date: 31-Mar-1998
• Withdrawal Date: 30-Oct-1998
• ICS: 83.080 - Plastics
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/SC 1/WG 8 - Polyvinyls
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 01-Apr-1998
• Completion Date: 01-Apr-1998
• Ref Project: SIST EN ISO 1158:2000 - Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine content (ISO 1158:1998)

Relations

• Revised: FprEN ISO 1158 - Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine content (ISO/DIS 1158:2025)
• Effective Date: 08-Nov-2023

Overview

EN ISO 1158:1998 - Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine content (adopted as SIST EN ISO 1158:2000) specifies analytical procedures for measuring the chlorine content of vinyl chloride homopolymers and copolymers that are free from plasticizers or other additives. The standard defines two validated combustion/titration routes to convert organic chlorine to chloride and quantify it by titration with silver nitrate (potentiometric or Volhard).

Key topics and requirements

• Two test methods
  • Method A - Combustion in a bomb: Test portion (≈0.25 g) mixed with sodium peroxide and a combustion aid, combusted in a gas- or electrically-fired bomb; combustion products dissolved and titrated.
  • Method B - Oxygen flask combustion: Smaller test portion (≈25–35 mg) placed on filter paper, combusted in an oxygen-filled flask with KOH/H2O2; resulting solution boiled with nitrate and titrated.
• Reagents and titration
  • Standard AgNO3 volumetric solution (0.1 or 0.05 mol·L−1) for chloride determination.
  • Nitric acid, sodium peroxide (Method A), gaseous oxygen, potassium hydroxide, hydrogen peroxide (Method B), and other specified reagents.
  • Final quantification by potentiometric or Volhard (volumetric) titration.
• Sample preparation
  • Samples must be powdered/granular and oven-dried (2 h at 75 °C or 16 h at 50 °C) before analysis.
• Calculation and reporting
  • Chlorine percentage is calculated from the difference between titrant volumes for sample and blank, adjusted by a factor related to AgNO3 concentration and divided by sample mass.
  • Results reported as the mean of two determinations (difference ≤ 0.2 percentage points).
• Safety and precautions
  • The standard includes explicit safety warnings for handling oxidizers, high-temperature combustion, and potential explosion risks.
• Precision
  • A formal precision statement is not included; interlaboratory data were not available at the time of publication.

Applications and users

• Quality control and production laboratories in PVC and vinyl polymer manufacturing for verifying chlorine content and basic polymer composition.
• Raw-material suppliers, converters and compounders who need to confirm polymer grade or compliance with specifications.
• Materials testing labs, R&D teams developing vinyl-based formulations, and recyclers verifying feedstock composition.
• Regulatory or certification bodies assessing material identity where chlorine content is a critical attribute.

Related standards

• This ISO method was prepared by ISO/TC 61 (Plastics). Laboratories commonly apply EN/ISO plastics test series; users should consider companion methods for additives, plasticizers, or residual monomers when full material characterization is required.

Keywords: EN ISO 1158:1998, chlorine content, vinyl chloride homopolymer, PVC, combustion titration, silver nitrate titration, potentiometric titration, Volhard method, material testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2000
3ROLPHUQLPDWHULDOL+RPRLQNRSROLPHULYLQLONORULGD'RORþHYDQMHNORUD,62

Plastics - Vinyl chloride homopolymers and copolymers - Determination of chlorine
content (ISO 1158:1998)
Kunststoffe - Vinylchloridhomopolymere und Copolymere - Bestimmung des
Chlorgehalts (ISO 1158:1998)
Plastiques - Homopolymeres et copolymeres de chlorure de vinyle - Dosage du chlore
(ISO 1158:1998)
Ta slovenski standard je istoveten z: EN ISO 1158:1998
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 1158
Third edition
1998-04-01
Plastics — Vinyl chloride homopolymers
and copolymers — Determination of
chlorine content
Plastiques — Homopolymères et copolymères de chlorure de vinyle —
Dosage du chlore
A
Reference number
ISO 1158:1998(E)
ISO 1158:1998(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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 1158 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.
This third edition cancels and replaces the second edition (ISO 1158:1984),
which has been technically revised.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 1158:1998(E)
Plastics — Vinyl chloride homopolymers and copolymers —
Determination of chlorine content
WARNING — All precautions shall be taken, particularly those mentioned in the text of the present
International Standard, to protect operators from risks presented by both methods.
1  Scope
This International Standard 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  Principle
A test portion is oxidised with sodium peroxide (method A) or gaseous oxygen (method B) followed by
potentiometric or volumetric titration of the resulting chlorides.
3  Reagents
During the analysis, use only reagents of recognized grade, and only distilled water or water of equivalent purity.
3.1  Silver nitrate, standard volumetric solution, c(AgNO ) = 0,1 mol/l or 0,05 mol/l.
3.2  Nitric acid solution, c(HNO ) = 2 mol/l.
For method A only:
3.3  concentrated.
Nitric acid,
3.4  Sodium peroxide, granulated.
3.5  Starch, sucrose or ethylene glycol, as combustion aids.
©
ISO 1158:1998(E) ISO
For method B only:
3.6  Oxygen, gaseous.
3.7  Sodium nitrate.
3.8  Potassium hydroxide solution, 100 g/l.
3.9  Hydrogen peroxide solution, 300 g/l.
4  Apparatus
4.1  Drying oven, capable of being maintained at 50 °C – 2 °C or 75 °C – 2 °C.
4.2  Balance, to weigh to an accuracy of 0,1 mg (method A) or 0,01 g (method B).
4.3  Equipment for Volhard titration or for potentiometric titration, with a burette having a capacity and
accuracy appropriate to the chosen method (A or B).
For method A only:
4.4  Combustion bomb, (for example Parr bomb or another bomb which gives the same results), gas or
electrically fired. An example of a suitable gas-fired bomb is shown in figure 1.
4.5  Nickel crucible with lid, to fit into the bomb (gas-fired). Suitable dimensions are: diameter 25 mm, height
40 mm. A smaller crucible could be used if the amount of test sample is reduced.
4.6  Safety oven.
4.7  Beaker, capacity 600 ml.
For method B only:
4.8  Round- or flat-bottomed flask, capacity 500 ml to 1 000 ml, with head designed for oxygen combustion (see
figure 2). A platinum wire 1,0 mm in diameter and 120 mm long in the shape of a tapered spiral is attached to the
stopper, a suitable spiral being 15 mm in diameter and 15 mm long. It is recommended that metal gauze be
wrapped around the flask for safety.
4.9  Filter paper, about 3 cm · 3,5 cm, free from halogens and ash.
4.10  Beaker, capacity 250 ml.
5  Test sample
The sample shall be in powdered or granular form, and if necessary shall be cut into pieces 1 mm to 3 mm in size.
The sample shall be oven-dried for 2 h at 75 °C or 16 h at 50 °C.
©
ISO ISO 1158:1998(E)
Approximate dimensions in millimetres
Figure 1 — Example of a combustion bomb, Figure 2 — Example of a flask for oxygen
gas-fired type combustion with platinum wire attached
(for method A) to stopper (for method B)
6  Procedure
6.1  Method A (combustion bomb)
6.1.1  First place 7 g to 7,5 g of sodium peroxide (3.4) in t
...