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.
Edition: 1 (Monolingual) ICS: 73.040 Status: Published Stage: 90.60 (2013-09-18) TC/SC: ISO/TC 27/SC 5 Number of Pages: 9
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