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125
c/coldchain·posted 23 days ago by u/analog_alphabet

[Explainer] excursion tables, and why "it got warm" is not a data point

Explainer

Right, the ice pack question again, but with numbers this time.

I have 12 data points over 22 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 45, not week 94. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

130 up / 5 down97% upvoted20 commentsid rhnorp6 Jul 2026

20 comments

15 in this archive, depth 6

best — the order this archive was captured in

u/rohan_steiner15 points·22 days ago

Strongly agree. Peak temperature is not the whole story.

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u/priya_ogunleye9 points·22 days ago

Do you have the logger trace?

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u/analog_alphabetOP6 points·22 days ago

Denmark to Denmark: 12 days with HJ and 19 days with BCH. Same route, different carriers, variance is real.

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u/mod_cold_roomMOD8 points·21 days ago

Removed a chain here. The rule is one line long and it is not negotiable.

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u/priya_guerrero3 points·21 days ago

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

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[removed]7 points·22 days ago

[removed by moderator]

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u/honest_syringe332 points·21 days ago

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

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u/analog_alphabetOP1 point·21 days ago

France to France: 14 days with BCH and 11 days with TFC. Same route, different carriers, variance is real.

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u/analog_alphabetOP5 points·22 days ago

data logger is the standard, gut feeling is not

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u/priya_guerrero3 points·21 days ago

stability after excursion is not zero, it is dose-dependent

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u/ferran_laurent2 points·21 days ago

customs clearance often breaks the cold chain, factor that in

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u/brigade_detector2 points·21 days ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/ewan_tulloch10 points·23 days ago

gel packs last 15 hours, after that you are relying on the box itself

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u/marit_laurent-30 points·22 days ago

This is correct. Dry powder is way more robust than liquid.

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u/india_generic_g0 points·23 days ago

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

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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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