SIST EN ISO 1158:2000

SLOVENSKI STANDARD
SIST EN ISO 1158:2000
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
SIST EN ISO 1158:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 1158:2000

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SIST EN ISO 1158:2000

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SIST EN ISO 1158:2000

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SIST EN ISO 1158:2000
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)

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SIST EN ISO 1158:2000
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 central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 1158:2000
©
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
3.2  Nitric acid solution, c(HNO ) = 2 mol/l.
3
For method A only:
3.3  concentrated.
Nitric acid,
3.4  Sodium peroxide, granulated.
3.5  Starch, sucrose or ethylene glycol, as combustion aids.
1

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SIST EN ISO 1158:2000
©
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.
2

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SIST EN ISO 1158:2000
©
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
...