ISO 21257:2018

INTERNATIONAL ISO
STANDARD 21257
First edition
2018-10
Plastics — Polymer polyols for use
in the production of polyurethane
— Determination of the residual
acrylonitrile and styrene monomer
content by gas chromatography
Reference number
ISO 21257:2018(E)
©
ISO 2018

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ISO 21257:2018(E)

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ii © ISO 2018 – All rights reserved

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ISO 21257:2018(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 2
6 Apparatus . 2
7 Preparation of calibration solution and sample solution . 3
7.1 General . 3
7.2 Method A for using OT column . 3
7.2.1 Preparation of internal standard solution . 3
7.2.2 Preparation of calibration solutions . 3
7.2.3 Preparation of sample solution . 4
7.3 Method B for using packed column . 4
7.3.1 Preparation of internal standard solution . 4
7.3.2 Preparation of calibration solutions . 4
7.3.3 Preparation of sample solution . 4
8 Procedure. 5
8.1 Gas chromatographic procedure .
...