ISO 8264:1989

Current Revision
Hard coal -- Determination of the swelling properties using a dilatometer

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Hard coal -- Determination of the swelling properties using a dilatometer

PUBLISH DATE 1989

A test piece, in the form of a pencil, prepared from powdered coal is heated at a constant rate in a steel retort positioned in a furnace, the temperature monitoring system having been previously calibrated using two reference metals of known melting points.

The change in level of a piton resting upon the test piece is observed continuously, and a record is produced which is characteristic of the swelling properties of the coal.

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