three years of purity threads, summarised so you do not have to read them
three years of purity threads, summarised so you do not have to read them, and I am aware this is a minority view on this board. The four things a certificate must carry, and what each one is for. Batch identifier ties the document to your vial; without it the document is about somebody else’s material. Date of…
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.
Asked for the storage condition behind the stability statement. Got it in a sentence. It is a two-line email and almost nobody sends it.
the counterion is part of the mass you paid for
ask for the storage condition the stability statement was written against
net peptide content and purity are two different numbers on the same vial
Does the lot on the vial match the lot on the page?
batch number, date of analysis, method, individual impurities — that is the minimum set
Correcting myself upthread: I said the date was missing and it is on the second page, which I had not scrolled to.
Yes — and the reason to ask for the whole page is that the interesting parts are the ones people crop out to fit a screenshot.
Did you ask for the batch-specific document, or is this the catalogue one?
Asked JEEP 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.
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.
The document I was worried about turned out to be a re-issue with a later creation date. Asked, got the original, entirely ordinary.
a total of 0.4% tells you less than four named impurities adding to 0.6%