ASTM C958-92(2022)

Anotácia textu normy ASTM C958-92(2022) :

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.


Keywords:
alumina, gravity sedimentation, particle size, particle size distribution, quartz, sedimentation ,, ICS Number Code 81.060.10 (Raw materials)