TWO COMMON METHODS of particle size measurement in the P/M industry are sieve analysis and the Fisher subsieve sizer. Sieve analysis is the most widely used method of determining particle size distribution of metal powders down to ~ 5 /''m. The test sieve is frequently the first quality control check on the receiving dock or the last verification of product quality before shipment.

The Fisher subsieve sizer also is used extensively throughout industry, especially for process control purposes where only relative values are required. This method can measure particle sizes between ""0.2 to 50 /m. These two common methods are briefly described in this article.

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