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c/coa·posted 6 days ago by u/alcohol_aversion

is 96.8% area% actually fine or am i being sold a rounding error

Question

I have had 21 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 40 days on nominally the same lane, which matters more in summer than in February.

The independent number came back 93.7% against a claimed 98.6%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.

Batch number is in the comments. Ask if you want the method.

0 up / 0 down47% upvoted4 commentsid taaage24 Jul 2026

4 comments

4 in this archive, depth 1

best — the order this archive was captured in

u/first_hundred0 points·5 days ago

no "is this good?" without saying what the compound and claimed purity are

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u/tuva_aalto-26 points·4 days ago

This is the correct framing. The COA structure matters as much as the number.

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u/tove_ogunleye2 points·5 days ago

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

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u/coa_collectorarchivist2 points·4 days ago

The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.

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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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