Hard coal — Determination of the swelling properties using a dilatometer
NORMA vydaná dňa 23.11.1989
Označenie normy: ISO 8264:1989
Dátum vydania normy: 23.11.1989
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO
Description / Abstract: 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.