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ASTM D440

2007 Edition, October 1, 2007

Complete Document

Standard Test Method of Drop Shatter Test for Coal

Includes all amendments and changes through Reapproval Notice , 2012


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Product Details:

  • Revision: 2007 Edition, October 1, 2007
  • Published Date: January 2012
  • Status: Active, Most Current
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 4
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This test method of drop shatter test2 covers the determination of the relative size stability and its complement, the friability, of sized coal. It affords a means of indicating the ability of coal to withstand breakage when subjected to handling at the mine and during transit to the consumer. The test method is serviceable for ascertaining the similarity of coals in respect to size stability and friability rather than for determining values within narrow limits in order to emphasize their dissimilarity. This test method is considered applicable for testing a selected single size of different coals, for testing different single sizes of the same coal, and for mixed sizes of the same or different coals.

NOTE 1—By single sizes is meant those with fixed upper and lower sieve opening limits, selected from those designated in 4.2; and by mixed sizes is meant either "slack" or a mixture of two or more single sizes.

This test method appears best suited for measuring the relative resistance to breakage of the larger sizes of coal when handled in thin layers such as from loader to mine car, from loading boom to railroad car, from shovel to chute, etc. While it may not be so well adapted for measuring the liability to breakage of coal when handled in mass, as in unloading open-bottom cars, emptying bins, etc., it is believed that the test method will serve also to indicate the relative size stability of composite sizes of coal where, in commercial handling, the smaller sized pieces have a cushioning effect which tends to lessen the breakage of the larger pieces of coal.

The values stated in inch-pound units shall be regarded as the standard. Mass may be expressed in metric values.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2 For information concerning the development and utilization of this drop shatter test method for coal the following references may be consulted:

Smith, C. M., "An Investigation of the Friability of Different Coals," University of Illinois, Engineering Experiment Station, Bulletin No. 196 UIBBA (1929); "The Friability of Illinois Coals," University of Illinois, Engineering Experiment Station, Bulletin No. 218 UIBBA (1930).

Yancey, H. F., and Zane, R. E., "Comparison of Methods for Determining the Friability of Coal," U.S. Bureau of Mines, Report of Investigations 3215 (1933).

Gilmore, R. E., Nicolls, J. H. H., and Connell, G. P., "Coal Friability Tests," Canadian Department of Mines, Mines Branch, No. 762 (1935).