ISO 3900:2023

INTERNATIONAL ISO
STANDARD 3900
Third edition
2023-07
Rubber — Nitrile latex —
Determination of bound acrylonitrile
content
Caoutchouc — Latex de nitrile — Détermination de la teneur en
acrylonitrile lié
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sampling and preparation of test sample . 2
8 Procedure .2
9 Expression of results . 2
10 Precision . 3
11 Test report . 3
Annex A (informative) Precision . 4
Bibliography . 6
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
This third edition cancels and replaces the second edition (ISO 3900:1995), which has been technically
revised.
The main changes are as follows:
— addition of an introduction to explain the purpose of this revision;
— deletion of the note in Clause 1 and in Clause 4;
— update of the apparatus in Clause 5;
— in Clause 7, deletion of the preparation for dried film of NBR latex and addition of the preparation
dried NBR latex in accordance with ISO 24698-2;
— modification of the determination method of bound acrylonitrile content in accordance with the
macro-method in ISO 1656;
— update of the procedure and addition of the suitable determination conditions, in Clause 8;
— addition of the precision data in Annex A.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Generally, the bound acrylonitrile content in nitrile latex is between 18 % and 45 %, expressed in the
nitrogen content in the range from 4,7 % to 11,9 %. In the previous version of this document, the bound
acrylonitrile content of emulsion-polymerized NBR lattices was determined in accordance with the
semi-micro method in ISO 1656. However, the semi-micro method is applicable to natural rubber and
natural rubber latex with lower nitrogen content; it is not applicable to determine nitrile latex. The
purpose of this document is to use the macro-method in ISO 1656 to determine the bound acrylonitrile
content in nitrile latex and to give the suitable determination conditions for nitrile latex.
v
INTERNATIONAL STANDARD ISO 3900:2023(E)
Rubber — Nitrile latex — Determination of bound
acrylonitrile content
WARNING — Persons us
...