ISO 4608:1998

INTERNATIONAL ISO
STANDARD 4608
Third edition
1998-05-01
Plastics — Homopolymer and copolymer
resins of vinyl chloride for general use —
Determination of plasticizer absorption
at room temperature
Plastiques — Résines d'homopolymères et de copolymères de chlorure
de vinyle à usages généraux — Détermination de la prise de plastifiant
à température ambiante
A
Reference number
ISO 4608:1998(E)

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ISO 4608:1998(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 4608 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.
This third edition cancels and replaces the second edition (ISO 4608:1984),
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
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Printed in Switzerland
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©
INTERNATIONAL STANDARD  ISO ISO 4608:1998(E)
Plastics — Homopolymer and copolymer resins of vinyl chloride
for general use — Determination of plasticizer absorption at room
temperature
1  Scope
This International Standard specifies a method for determining plasticizer absorption at room temperature. It is
applicable to PVC general-purpose resins and filler resins (designated "G" and "F" in ISO 1060-1:1998, Plastics —
Homopolymer and copolymer resins of vinyl chloride — Part 1: Designation system and basis for specifications).
The object of the test is to determine the quantity of plasticizer absorbed by a resin at room temperature to give a
dry mixture.
The results give a general indication of the plasticizer absorption of a resin at room temperature. They indicate the
usefulness of resins for the manufacture of plasticized dry blends, particularly when taken in conjunction with the
results of plasticizer absorption tests under hot conditions.
2  Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 1385-1:1977, Phthalate esters for industrial use — Methods of test — Part 1: General.
3  Principle
An excess of bis-(2-ethylhexyl) phthalate (DOP) is added to a specified amount of resin. The mixture is then
centrifuged under defined conditions and the amount of plasticizer retained by the resin determined.
4  Apparatus and materials
Ordinary laboratory apparatus, plus the following:
4.1  Balance, capable of weighing to 0,1 mg.
3 3
4.2  Burette, for example 50 cm , graduated at 0,1 cm intervals.
1

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ISO
ISO 4608:1998(E)
4.3  Centrifuge, whose rotor turns in a horizontal plane and which has an acceleration under the test conditions of
–2 –2
24 500 m⋅s to 29 500 m⋅s measured at the bottoms of the tubes, with, if necessary, a cooling system to prevent
the temperature of the mixture from exceeding 30 °C at the end of centrifuging for 60 min.
NOTE —  It is permissible to use different centrifuging conditions, i.e. a different acceleration, a different time and smaller
centrifuge tubes (see 4.4), provided that it has been verified that the results obtained are equivalent.
4.4  Centrifuge tubes, to fit the centrifuge used, each consisting either of a tube, made of glass or another
material, with a conical bottom pierced by a hole of about 0,8 mm diameter (see figure 1) or of a cylindrical tube
fitted at one end with a sieve plate o
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