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ISO 5940:1981

Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of softening point by the ring-and-ball method

May 1, 1981
95.99 Withdrawal of Standard   Oct 3, 2019

General information

95.99     Oct 3, 2019

ISO

ISO/TC 226

International Standard

71.100.10  

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Scope

Specifies a method using a disc-shped test piece to be prepared by moulding a test portion ina ring which is fitted into a heated bath. A steel ball is placed on the upper surface of the test piece. Then the temperature (softening temperature) is determined at which the test piece, on heating at a prescribed rate, softens sufficiently to sag to a specifeid depth under the mass of the ball. Details on the thermometers to be used and information on the melting of pitch samples are included in two annexes.

Life cycle

NOW

WITHDRAWN
ISO 5940:1981
95.99 Withdrawal of Standard
Oct 3, 2019

REVISED BY

PUBLISHED
ISO 5940-1:2019