ISO 5940-1:2019
Carbonaceous materials for the production of aluminium — Pitch for electrodes — Part 1: Determination of softening point by the ring-and-ball method
This document specifies the ring-and-ball method, a method of using the ring-and-ball apparatus for the determination of the softening point (softening temperature) of pitch used in the production of aluminium.
The method is applicable to pitches having softening points equal to or greater than 30 °C.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Procedure
7.1 Preparation of test portion
7.2 Preparation of the apparatus
7.3 Determination
8 Expression of results
8.1 Method of calculation
8.2 Precision
9 Test report
Annex A (normative) Thermionic devices for temperature sensing and output
Annex B (normative) Melting of pitch samples
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Procedure
7.1 Preparation of test portion
7.2 Preparation of the apparatus
7.3 Determination
8 Expression of results
8.1 Method of calculation
8.2 Precision
9 Test report
Annex A (normative) Thermionic devices for temperature sensing and output
Annex B (normative) Melting of pitch samples