ISO 7431-1:2024
(Main)Thiourea for industrial use — Part 1: Test methods
Thiourea for industrial use — Part 1: Test methods
The document specifies test methods for industrial thiourea properties, such as thiourea content, water insoluble substance, ignition residue, initial melting point, turbidity, thiocyanate content, calcium element and heavy metals.
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INTERNATIONAL ISO
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)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
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 .
...
ISO DIS 7431-1:2023(E)
Style Definition: List Number 1: Tab stops: Not at
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ISO TC 47/WG 3
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pt
Secretariat: JISC
Style Definition: a2: Tab stops: 18 pt, List tab
Date: 2023-08-1510-09
Style Definition: a3: Tab stops: 36 pt, List tab
Thiourea for industrial use — Part 1: Test methods
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ISO/DIS 7431-1:2023(E)
Formatted: English (United Kingdom)
© ISO 2023 Formatted
Formatted: English (United Kingdom)
All rights reserved. Unless otherwise specified, or required in the context of its implementation,
no part of this publication may be reproduced or utilized otherwise in any form or by any means,
electronic or mechanical, including photocopying, or posting on the internet or an intranet,
without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 7431-1:2023(E)
Formatted: English (United Kingdom)
Contents
Foreword . iv
Introduction. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods . 1
© ISO 2023 – All rights reserved iii
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ISO/DIS 7431-1:2023(E)
Formatted: English (United Kingdom)
Foreword . iv
Introduction. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods . 1
iv © ISO 2023 – All rights reserved
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ISO/DIS 7431-1:2023(E)
Formatted: English (United Kingdom)
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 Electr
...
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