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ASTM C958-92(2014)

Historical Reaffirmation

Standard Test Method for Particle Size Distribution of Alumina or Quartz by X-Ray Monitoring of Gravity Sedimentation

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1.1 This test method covers the determination of the particle size distribution of alumina or quartz powders in the range from 0.5 to 50 μm and having a median particle diameter from 2.5 to 10 μm using a sedimentation method. This test method is one of several found valuable for the measurement of particle size. Instruments used for this test method employ a constant intensity X-ray beam that is passed through a sedimenting dispersion of particles.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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. For specific hazard statements, see Section 7.


This test method details the standard procedures for the determination of the particle size distribution of alumina or quartz powders using X-ray monitoring of gravity sedimentation. This test procedure shall make use of an X-ray sedimentation apparatus, and ultrasonic probe or bath. An aqueous homogeneous dispersion of the specimen is permitted to settle in a cell. The decrease in particle concentration over a programmed settling distance is monitored by an X-ray beam passing through the sedimenting dispersion to a detector. The specimen concentration at any given sedimentation distance is inversely proportional to the X-ray flux and the equivalent diameter (spherical) is calculated from Stokes' law.


SDO ASTM: ASTM International
Document Number C958
Publication Date Jan. 1, 2014
Language en - English
Page Count 2
Revision Level 92(2014)
Supercedes
Committee C21.04
Publish Date Document Id Type View
May 1, 2022 C0958-92R22 Reaffirmation
Jan. 1, 2014 C0958-92R14 Reaffirmation
May 1, 2007 C0958-92R07 Reaffirmation
Jan. 1, 2000 C0958-92R00 Reaffirmation
Jan. 1, 2000 C0958-92R97E01 Reaffirmation