Title: powder grades
Long Title: IUPAC Gold Book - powder grades
DOI: 10.1351/goldbook.15226
Status: current

Definition
Defined for powders used pharmaceutically, according to particle sizes.

Note
It is required that when the fineness of a powder is described by a number, all particles must pass through a sieve with aperture diameter in microns equal to that number.

Related Term
- powders: https://goldbook.iupac.org//terms/view/15227

Source
- PAC, 2009, 81, 971. 'Glossary of terms related to pharmaceutics (IUPAC Recommendations 2009)' on page 994 (https://doi.org/10.1351/PAC-REC-04-10-14)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/15226/html
- json: https://goldbook.iupac.org/terms/view/15226/json
- xml: https://goldbook.iupac.org/terms/view/15226/xml

Citation: Citation: 'powder grades' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.15226
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-04-17T23:16:52+00:00