ISO 22498:2005

INTERNATIONAL ISO
STANDARD 22498
First edition
2005-07-15
Plastics — Vinyl chloride homopolymer
and copolymer resins — Particle size
determination by mechanical sieving
Plastiques — Résines d'homopolymères et de copolymères de chlorure
de vinyle — Détermination de la taille des particules par tamisage
mécanique
Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 2
5 Materials . 2
6 Apparatus . 2
7 Procedure . 2
8 Number of determinations . 3
9 Calculation and expression of results. 3
10 Precision. 4
11 Test report . 4

Foreword
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(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22498 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic
materials.
iv © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 22498:2005(E)

Plastics — Vinyl chloride homopolymer and copolymer
resins — Particle size determination by mechanical sieving
1 Scope
This International Standard specifies a method for the determination of the size distribution of particles of vinyl
chloride homopolymer and copolymer resins by measuring the amounts retained on a selection of sieves
having meshes of various aperture sizes.
The results can be expressed either in terms of the amount retained on the individual sieves or as the mean
particle size for the whole test sample.
The method is not recommended for use with sieves having mesh sizes smaller than 0,038 mm.
2 Normative references
The following referenced documents are indispensable for the application 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 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of
openings
ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore
hardness)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sieve retention
percentage, by mass, of the resin test sample retained on a given sieve at the end of the test procedure
3.2
pan retention
percentage, by mass, of the resin test sample retained in the pan at the bottom of the stack of sieves, or under
a single sieve, at the end of the test procedure
3.3
mean particle size
single value, expressed to the nearest 0,001 mm, representing the dominant particle of the whole test sample
4 Principle
A test s
...