unpopular opinion: most of what gets said here about area percent is guesswork
Something I keep coming back to: unpopular opinion: most of what gets said here about area percent is guesswork. Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently. Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label weight.…
Left up and flaired Explainer. This is the answer we keep linking, written properly.
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redact your own name, never the batch details
Asked TFC for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for everybody.
Cosigning. The batch identifier is load-bearing, and a certificate that cannot be tied to the vial in your hand is not about your vial.
My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.
a total of 0.4% tells you less than four named impurities adding to 0.6%