ISO-5940 Carbonaceous materials for the production of aluminium -- Pitch for electrodes -- Determination of softening point by the ring-and-ball method

ISO-5940 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 5940:1981

Revision Level

1ST EDITION

Status

Current

Publication Date

May 15, 1981

Committee Number

ISO TC 47/SC 7