[Vendor] WXT order #4 — 8 days Wuxi to UK, cold pack still solid
WXT order #4 — 8 days Wuxi to UK, cold pack still solid. Posting it because I searched for this exact thing before ordering and found nothing useful. 8 days — those are the numbers, and they are the ones I am willing to defend. Why the directory has two tiers, since the question comes up whenever somebody new finds…
This. Ask for the batch record. The ones who send it inside a day have told you more than any review could.
Right — HJ publishes the method line on the certificate, and once you have seen one that does you notice every one that does not.
consistency across lots beats one spectacular result
ask for the batch record before you ask for a discount
Correction: that supplier is in the documented twenty with a source page, not in the wider-market table. Different evidence bases entirely.
Six orders across two years from KP. Same packaging, same paperwork, same lead time. The most boring supplier relationship I have and I mean that as praise.
How many separate lots is that across? One lot tested twice is one data point.
A certificate with a purity figure and no method line is not falsifiable. You cannot reproduce it, you cannot check it, and it tells you nothing about how the number was produced.
That reads as a recommendation and the source pages deliberately are not. They are a record you use to make your own decision.
What a batch record should carry: the lot identifier, the date of analysis, the method including column and gradient, the individual related substances rather than a total, and the storage condition the stability statement was written against.
Core Peptides came up in three threads the week I was ordering and I could not find a single independent result for them anywhere. Went with a documented supplier instead.
I would separate documentation from logistics. A supplier can be excellent at one and ordinary at the other, and averaging them hides it.