Chemical purity
qualitative signifier of chemical purity level
In chemistry, chemical purity is the measurement of the amount of impurities found in a sample. Several grades of purity are used by the scientific, pharmaceutical, and industrial communities. Some of the commonly used grades of purity include:
ACS grade is the highest level of purity, and meets the standards set by the American Chemical Society (ACS). The official descriptions of the ACS levels of purity is documented in the Reagent Chemicals publication, issued by the ACS. It is suitable for food and laboratory uses.
Reagent grade is almost as stringent as the ACS grade.
USP grade meets the purity levels set by the United States Pharmacopeia (USP). USP grade is equivalent to the ACS grade for many drugs.
NF grade is a purity grade set by the National Formulary (NF). NF grade is equivalent to the ACS grade for many drugs.
British Pharmacopoeia: Meets or exceeds requirements set by the British Pharmacopoeia (BP).
“Chemical purity” enters the record as qualitative signifier of chemical purity level. Crown Archives preserves that source wording while asking what Chemical, purity and qualitative can confirm, complicate or overturn.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Jul 8, 2026. The linked authority identifier is Q104856779.
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This entry incorporates text from “Chemical purity” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.