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c/coldchain·posted 4 months ago by u/curious_panel_only

[PSA] ice pack is not what most of this community thinks it is

PSA Receipts ×9 Long Haul ×1

ice pack is not what most of this community thinks it is, and I say this having got it wrong myself for long enough to be annoyed about it.

Asked KP which lines they hold regionally and got a straight list back. That answered my summer ordering question completely.

Kept a vial at room temperature for eleven days by accident. Tested it out of guilt. It was fine.

Ordered from the warehouse in Denmark instead of origin and the transit went from a fortnight to 3 days. Entirely different proposition in August.

I will update this if the picture changes rather than quietly leaving it up.

1,976 up / 276 down88% upvoted13 commentsid 1vfty118 Mar 2026

13 comments

5 in this archive, depth 3

best — the order this archive was captured in

u/andres_restrepo144 points·4 months ago

A stability statement is only meaningful with its conditions attached: temperature, duration, light exposure, and whether it covers powder or solution. Ask which.

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u/ice_pack_auditcold chain78 points·4 months ago

On loggers, since I was sceptical and then bought one.

A small transit logger costs a fraction of a vial and records the whole journey rather than the moment of arrival. What I learned from three of them: my lane is far more stable than I assumed, the one excursion I did capture was on a weekend, and the arrival-temperature guessing I had been doing was worthless.

If you are going to argue about cold chain, argue from a chart. It is a one-off purchase and it ends the speculation permanently.

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u/curious_panel_onlyOP31 points·4 months ago

fridge, not freezer, once it is in solution

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u/kofi_ferreira9 points·4 months ago

Disagree with the panic framing. Lyophilised material tolerates ordinary transit conditions far better than these threads imply.

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About c/coldchain

Temperature and stability in the real world: what an excursion actually costs you, why lyophilised powder is far more forgiving than reconstituted solution, how to read a logger CSV, and how to photograph a failed shipment so the conversation with the vendor is short.

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  1. Excursion claims need a logger trace or a photo taken at unboxing. "It felt warm" is not data.
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