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This document describes the Blaine method for determining average particle size of powders. [1] The method measures the surface area of powders by timing how long it takes air to pass through a packed sample, then calculates the average grain diameter assuming spherical particles. [2] Two companies, Tonindustrie Prüftechnik and Ströhlein Instruments, supply the necessary porosity testers. [3] A detailed calculation is provided relating the initial weight, specific gravity, flow time and other measured value

Author

dondo1004

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EN