ASTM D6682-01(2006)

1.1 This test method is applied to the measurement of the mechanical properties of powders as a function of normal stress.

1.2 This apparatus is suitable measuring the properties of powders and other bulk solids, up to a particle size of 5000 micron.

1.3 This method comprises four different test procedures for the determination of powder mechanical properties:

1.3.1 Test A - Measurement of INTERNAL FRICTION as a function of normal stress.

1.3.2 Test B - Measurement of WALL FRICTION as a function of normal stress.

1.3.3 Test C - Measurement of BULK DENSITY as a function of normal stress and time.

1.3.4 Test D - Measurement of DEGRADATION as a function of normal stress.

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.

The test method is useful for the following:

5.1.1 Classification of Powders—The cohesion and angle of internal friction are flowability indicators of powders and can be used to classify the powders.

5.1.2 Quality Control—For a number of industrial applications flowability factors are used to compare the material flowability at different times during production. The material produced has to be held within given limits for each application and each powder so as to ensure trouble-free operation.

5.1.3 Material Engineering—Powder properties are influenced by particle size, particle size distribution, fat content, humidity and other parameters. By selecting the correct parameters and the correct mixtures of powders, the required mechanical properties of the product are achieved.

5.1.4 Design of Handling Equipment—For certain storage and conveyor equipment there are mathematical models exist which require the mechanical properties of powders.