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289
c/coldchain·posted 1 year ago by u/curious_panel_only

stability — my 18-week log, condensed into one table

Data Cold Box ×5

Trying to settle this properly because the thread from last year went in circles.

The claim: lyophilised matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 9 months without either producing anything.

What would actually settle it is 37 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

296 up / 7 down98% upvoted24 commentsid 1q5v6v4 Jun 2025

24 comments

16 in this archive, depth 5

best — the order this archive was captured in

u/fatima_yildiz-27 points·1 year ago

Do you have the logger trace?

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u/anjali_tamm1 point·1 year ago

lane reports need origin, destination, carrier, and actual transit days

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u/nils_ferreira1 point·1 year ago

lane reports need origin, destination, carrier, and actual transit days

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/usb_logger_ursula1 point·1 year ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/emeka_delgado1 point·1 year ago

gel packs last 24 hours, after that you are relying on the box itself

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u/lina_almeida31 points·1 year ago

Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.

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u/bastian_ekstrom17 points·1 year ago

excursion claims need a logger trace or a photo at unboxing, not "it felt warm"

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u/sterile_field_steph26 points·1 year ago

Not convinced. The evidence does not support that reading.

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u/ewan_tulloch14 points·1 year ago

a warm courier van is a bigger problem for a mixed vial than for dry powder

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u/curious_panel_onlyOP23 points·1 year ago

Spain to Spain: 16 days with CPC and 13 days with FGP. Same route, different carriers, variance is real.

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u/marit_laurent7 points·1 year ago

The gel pack lasted 15 hours in a courier van, then liquid. Powder itself fine, the cold chain mostly died in transit.

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u/emeka_beaulieu2 points·1 year ago

no tracking numbers, no full addresses, no label photos — instant removal

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u/plain_titration_202420 points·1 year ago·edited

You have restated the marketing copy. What is the actual substance here.

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u/nadia_kjaer7 points·1 year ago

the logger trace is the data that matters, not the packaging promises

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u/aleksi_eriksen18 points·1 year ago

customs clearance often breaks the cold chain, factor that in

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