Reading a certificate of analysis: the eight lines that actually matter
Assay is the headline, but chlorides, iron, moisture and insoluble matter decide whether a lot behaves in your process. A practical guide to the COA fields worth checking before release.
The lot number and release date are the first fields to verify — an unlinked COA cannot support a batch record.
A typical value is not a limit. Compare each result with the limit on your purchase specification.
Method and basis decide whether two assay numbers are actually comparable.