ISO 1138:2022

Rubber compounding ingredients — Carbon black — Determination of sulfur content

This document specifies two methods for the determination of the total sulfur in all types of carbon black for use in the rubber industry: — Method A, using a combustion furnace; — Method B, using an automatic analyser. With respect to safety aspects and test precision, it is preferable to use automatic systems. Method B is therefore the preferred method. Classical chemical analysis (Method A) is acceptable if automatic equipment is not available.

Ingrédients de mélange du caoutchouc — Noir de carbone — Dosage du soufre total

General Information

• Status: Published
• Publication Date: 16-Jun-2022
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: ISO/TC 45/SC 3 - Raw materials (including latex) for use in the rubber industry
• Drafting Committee: ISO/TC 45/SC 3/WG 3 - Carbon black, silica and rubber chemicals
• Current Stage: 6060 - International Standard published
• Due Date: 01-Nov-2023
• Completion Date: 17-Jun-2022

RELATIONS

• Replaces: ISO 1138:2007 - Rubber compounding ingredients — Carbon black — Determination of sulfur content
• Effective Date: 26-Nov-2021
• Replaces: ISO 1138:2007/Amd 1:2012 - Rubber compounding ingredients — Carbon black — Determination of sulfur content — Amendment 1: Clarification of digestion temperature in Subclause 3.4.5
• Effective Date: 26-Nov-2021

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 1138
Third edition
2022-06
Rubber compounding ingredients —
Carbon black — Determination of
sulfur content
Ingrédients de mélange du caoutchouc — Noir de carbone — Dosage
du soufre total
Reference number
ISO 1138:2022(E)
© ISO 2022
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ISO 1138:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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© ISO 2022 – All rights reserved
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ISO 1138:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Method A: Combustion furnace ............................................................................................................................................................ 1

4.1 Principle ....................................................................................................................................................................................................... 1

4.2 Reagents ....................................................................................................................................................................................................... 1

4.3 Apparatus .................................................................................................................................................................................................... 2

4.4 Procedure .................................................................................................................................................................................................... 2

4.5 Expression of results ........................................................................................................................................... .............................. 3

4.6 Test report .................................................................................................................................................................................................. 3

5 Method B: Automatic analyser .............................................................................................................................................................. 3

iii
© ISO 2022 – All rights reserved
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ISO 1138:2022(E)
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

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electrotechnical standardization.

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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

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www.iso.org/iso/foreword.html.

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 ISO 1138:2007 and ISO 1138:2007/Amd 1:2012, which have

been technically revised.
The main changes are as follows:

— withdrawal of the method using an oxygen bomb calorimeter (previously called Method A) due to

the use of hazardous chemicals, and withdrawal of Amendment 1:2012 related to that method;

— addition of CAS numbers to the chemical reagents used in the current Method 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.
© ISO 2022 – All rights reserved
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INTERNATIONAL STANDA
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