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See Chinese contents: GB/T 21524-2008 GB/T 21524-2008: Particle size determination of inorganic chemical products -- Sieving method
This Standard specifies the methods for the determination of particle size in inorganic chemical products. This Standard is applicable to the determination of particle size in inorganic chemical products with a particle size larger than 45 ¦Ìm and are non-hygroscopic or insoluble in water.
