coming back after 15 months with a follow up result, where do i put it
#test-results 2025-09-08
Monday37 messages10 participantstimes are UTC
Highlights from this day
- batch_bandit — a result without a lot number and a purchase date is an anecdote with a pdf attached 17:39
- batch_bandit — post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later 18:10
- LC_MS_Lena — i told JEEP about a result they would not have liked and they did not argue. credit where it is due, i think 18:15
- new_here_nat — slightly off topic but 98.1 against a certificate of 96.8 is fine. the same supplier landing low four times in a row is a question 18:40
- new_here_nat — anyone tested the same lot twice at different labs my sheet has 5 lots from MKM with a spread under a point, which is tight 21:17
is a purity-only test worth the money if underfill is the common failure
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sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
my vial assayed under label but the purity was fine, which matters more
how do you post a result so it is actually useful to somebody in a year
i had a result i am fairly sure was a handling error on my side and i logged it as such, ask me again in a month
a point or two between the certificate and an independent result is inside what two labs disagree by
is quantity testing available as a separate thing or bundled
a result without a lot number and a purchase date is an anecdote with a pdf attached
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the widest spread in my data is about 2.6 percentage points across five lots from one supplier
has a supplier ever disputed a result posted here
coming back to this whats the underfill rate people are actually seeing
[edited]post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
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thats a fill problem
posting my Medutest result on lot F-1330, what do people make of it
i told JEEP about a result they would not have liked and they did not argue. credit where it is due, i think
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quantity testing is usually a separate line item and it is the one worth paying for
i test roughly every tenth vial. it is a sampling strategy, not paranoia
whats the worst result anyone has logged and what happened next
thats not great
slightly off topic but 98.1 against a certificate of 96.8 is fine. the same supplier landing low four times in a row is a question
attach the pdf
if you are testing to settle an argument you will not settle it with n of 1
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
update from 9 months ago: retested the same supplier, result came back better, logged both, we shall see
if the vial has been through a bad transit you are testing the transit as much as the supplier, your mileage will differ
one data point
log the lot number
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a supplier disputing a result is rare here and it has never gone well for the supplier
do you test every order or sample it
do the results in this channel skew because people test when suspicious
my result contradicts the supplier certificate, do i tell them
20:42ferrous_ash pinned a message to this channel
how many lots do you need before you can say anything about a supplier
underfill is more common than impurity. if you only test purity you are testing the less likely failure
anyone tested the same lot twice at different labs
my sheet has 5 lots from MKM with a spread under a point, which is tight
weigh it first