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 record is produced which is characteristic of the swelling properties of the coal.
Status: PublishedPublication date: 1989-11
Edition: 1Number of pages: 9
Technical Committee: ISO/TC 27/SC 5 Methods of analysis
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