Section 2: Official USP Powder Classifications

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6 Terms

1
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USP Powder Grading Sieve Rule

Finer mesh sieves possess smaller particle size openings, whereas larger mesh numbers retain coarse material.

2
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Very Coarse Vegetable/Animal Drugs

Classified as powders where all particles pass through sieve no. 8 and Not More Than 20% (NMT 20%) pass through sieve no. 60.

3
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Coarse Vegetable/Animal Drugs

Classified as powders where all particles pass through sieve no. 20 and Not More Than 40% (NMT 40%) pass through sieve no. 60.

4
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Moderately Coarse Vegetable/Animal Drugs

Classified as powders where all particles pass through sieve no. 40 and Not More Than 40% (NMT 40%) pass through sieve no. 80.

5
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Fine Vegetable/Animal Drugs

Classified as powders where all particles pass through sieve no. 60 and Not More Than 40% (NMT 40%) pass through sieve no. 100.

6
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Very Fine Vegetable/Animal Drugs

Classified as powders where all particles pass cleanly through sieve no. 80 with no further percentage restrictions.