ASTM D 6393/D6393M : 2021

1.1This test method covers an apparatus and procedures for measuring properties of bulk solids, henceforth referred to as Carr Indices.2

1.2This test method is suitable for free flowing and moderately cohesive powders and granular materials up to 2.0 mm [¹/₁₆in.] in size. Materials must be able to pour through a 6.0 to 8.0-mm [¹/₄to ⁵/₁₆in.] diameter funnel outlet when in an aerated state.

1.3This method consists of eight measurements and two calculations for Carr Indices as follows. Each measurement, or calculation, or combination of them, can be used to characterize the properties of bulk solids.

1.4All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

1.5Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.6This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.