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STANDARD 7431-1
First edition
Thiourea for industrial use —
Part 1:
Test methods
PROOF/ÉPREUVE
Reference number
ISO 7431-1:2023(E)
© ISO 2023
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ISO 7431-1:2023(E)
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© ISO 2023
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Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
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ISO 7431-1:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods . 2
4.1 General . 2
4.2 Determination of thiourea content. 2
4.2.1 Principle . 2
4.2.2 Reagents . 2
4.2.3 Apparatus . 2
4.2.4 Procedure . 3
4.2.5 Calculation . 3
4.2.6 Expression of results . 3
4.3 Determination of water insoluble substance . 3
4.3.1 Principle . 3
4.3.2 Apparatus . 3
4.3.3 Procedure . 4
4.3.4 Calculation . 4
4.3.5 Expression of results .
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