ISO 5940:1981
Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of softening point by the ring-and-ball method
Reference number
ISO 5940:1981
Edition 1
ISO 5940:1981
Withdrawn (Edition 1, 1981)


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.

General information

  •  : Withdrawn
     : 1981-05
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 5
  • ISO/TC 226
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