#storage-coldchain 2025-06-16

if you are worried after a bad transit, test it. that is what the testing channels are for

is a five pound fridge thermometer actually worth it

do i need to worry about light exposure or is that overthinking

coming back after 10 months, is the pinned storage table still current

my fridge is running at 4.8, is that out of range

i freeze aliquots and have had them test fine afterwards. others here would not do it and i understand why

i left a reconstituted vial out overnight once, sent it for testing out of curiosity, it came back fine

do you keep the unopened vials and the in-use one in the same place

package sat in a metal mailbox in 32C sun for about six hours. gel packs are liquid and warm. is it dead

almost certainly not

it shipped as lyophilised powder, yes?

yes. sealed vials, dry powder

then you are fine. dry powder is far more robust than people assume. that is the entire reason it is freeze dried

so why bother with cool packs at all

margin, and because some shipments spend three weeks in a customs shed. the packs are for the worst case, not the normal one

mine arrive warm nine times out of ten and i have never had a bad assay

i had one arrive with the vials genuinely hot to the touch. tested it out of curiosity

came back where i expected. one data point, not a study

purity is not the whole answer. aggregation can happen without moving a purity number much

what would worry you

already-reconstituted liquid arriving warm. that is a different conversation

nobody should be shipping you reconstituted anything

agreed, and yet people do it

so the rule is powder warm equals fine, liquid warm equals suspicious

roughly. and repeated cycles are worse than one long warm spell

the mailbox part is really a delivery problem. i switched to a pickup point

collection point or a work address. mailboxes in summer are ovens

doing that from now on

and get it in the fridge when it lands, even though it did not have to be

no harm in that. powder in the cold is powder that stays boring

mixed one. dissolved clean, no cloudiness, no bits

so six hours in a hot mailbox did nothing observable. logging that with the others

small sample of one but i will take it