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c/coa·submitted 3 months ago by u/first_hundred

[Meta] proposal — a flair for certificate of analysis posts

Discussionbranch of 12 comments

I have had 10 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 32 days on nominally the same lane, which matters more in summer than in February. The independent number came back 99.0% against a claimed…

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12 comments, started 3 months ago
u/certified_referenceMOD154 points·3 months ago

Retitled to remove editorialising. Put the evidence in the body.

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u/first_hundredOP86 points·3 months ago

Dead space in the needle hub holds a small but non-trivial volume. On low-volume draws that can be several units.

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u/soren_zamora-8 points·3 months ago

the related substances line is where the story is

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u/first_hundredOP49 points·3 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/priya_palacios37 points·3 months ago

post the whole document, not the headline number

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u/coa_janitormod · c/coa28 points·3 months ago

Are you looking at area% or net peptide content? Different numbers.

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u/teodor_jansen50 points·3 months ago

redact your own name, not the vendor's batch details

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u/isabela_nilsen37 points·3 months ago

redact your own name, not the vendor's batch details

Disagree on that part. 98.7% and 98.9% on the same vial is normal.

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u/sofia_danquah34 points·3 months ago

Water content on the document? That affects your concentration math.

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About c/coa

How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
  2. Redact your own name and order id, not the vendor's batch details.
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