90.92 Standard to be revised Feb 2, 2026
ISO
ISO/TC 27/SC 5 Methods of analysis
International Standard
73.040 Coals
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.
PUBLISHED
ISO 8264:1989
90.92
Standard to be revised
Feb 2, 2026
IN_DEVELOPMENT
ISO/DIS 8264