Active Standard ASTM D441 | Developed by Subcommittee: D05.07
Book of Standards Volume: 05.06
Historical (view previous versions of standard)
Significance and Use
1.1 This test method covers the determination of the relative friability of a particular size of sized coal. It affords a means of measuring the liability of coal to break into smaller pieces when subjected to repeated handling at the mine or subsequently, by the distributor or by the consumer. This test method is serviceable for ascertaining the similarity of coals in respect to friability rather than for determining values within narrow limits to emphasize their dissimilarity. This test method also may serve to indicate the relative extent to which sized coals will suffer size degradation in certain mechanical feed devices. This test method may be used for differentiating between certain ranks and grades of coal, and therefore the test method is of service for coal classification purposes.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2234/D2234M Practice for Collection of a Gross Sample of Coal
D4749 Test Method for Performing the Sieve Analysis of Coal and Designating Coal Size
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
ICS Number Code 73.040 (Coals)