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Abradability Index of Refractory Materials - Test Method

Abradability Index of Refractory Materials - Test Method - BS 1902-4.6:1985


Methods of testing refractory materials. Properties measured under an applied stress. Determination of resistance to abrasion at ambient temperature (abradability index at ambient temperature) (method 1902-406).


Abradability index is a measure of the erodability of a refractory material, expressed as a volume of material lost.

The index represents 100 times the volume in centimetres cubed of material abraded from a test piece which has been subjected to bombardment by brown fused alumina grain for a specified time under specified conditions.


The loss in mass of a dried test piece is measured when it is subjected to the abrasive action of a specific quantity of calibrated brown fused alumina grain. The abradability index of the test piecein terms of volume loss is obtained by calculation using the measured loss in mass, a calibration correction derived from the standardization of the abrasion apparatus and alumina grain, the bulk density of the test piece and a multiplication factor of 100.

Further details

Refractoriness under load (RuL) is the deformation behaviour of a refractory subjected to the combined effects of load, time and temperature. The test typically involves applying a compressive load at elevated temperature to determine the resistance of the refractory (or refractories) to deformation (ISO 1893-89).

There are two types of RuL test. The Rising Temperature Test and the Maintained Temperature (Creep) Test.


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