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ASTM C721-15
- Standard Test Methods for Estimating Average Particle Size of Alumina and Silica Powders by Air Permeability
- standard by ASTM International, 12/01/2015
- Publisher: ASTM
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1.1 These test methods cover the estimation of the average particle size in micrometres of alumina and silica powders using an air permeability method. The test methods are intended to apply to the testing of alumina and silica powders in the particle size range from 0.2 to 75 μm.