Is a TFC order from Tianjin likely to hold cold chain to Poland?

Stated plainly: TFC · Tianjin · Poland.

The failure mode I am trying to avoid is making this decision emotionally.

I have twelve months in view and I would like the plan to survive that long.

How would you structure this, and what thresholds would you set in advance?

Start with the physical state, because it changes the answer completely and is the first thing to establish.

A pack that arrived hard tells you about the last day of transit only, since it will have melted and, if the ambient dropped, partially refrozen.

Worth being precise here: anything shipped in solution is a different risk category, because hydrolysis and deamidation proceed in the aqueous phase and are strongly temperature-dependent.

A liquefied pack is expected. It is not evidence of a problem.

This is where the anxiety in this hobby is most out of proportion to the chemistry.

That is the argument for shipping lyophilised rather than for shipping colder. A dry powder with low residual moisture is stable at ambient for months; the pathways that matter need water.

More usefully, asking a supplier to hold a shipment during a heatwave is reasonable and the better ones agree; the cost is a week and the benefit is a shorter warm exposure for anything in solution.

Single-use temperature loggers are standard practice in supply chains where temperature genuinely matters and are inexpensive at parcel scale.

Lyophilised tolerates the lane. That is the answer for almost every order.

edited 14 Jan 2025 by marta_okonkwo — updated for the 2026 guidance change

In practice, if temperature history matters to you, buy a data logger. It is the only way to know.

A single phase-change pack in a thin-walled box holds below ten degrees for roughly one to two days at twenty-five degrees ambient, and under a day at thirty-five. On a nine-to-fourteen-day lane the material is at ambient for most of the journey whatever was packed with it.

Mechanically, arrhenius behaviour means the degradation rate roughly doubles per ten degrees. A week at thirty degrees is therefore a meaningful exposure for a solution and an immaterial one for a dry solid.

Nothing here is medical advice, and research-use compounds are not approved for human use.

Solutions are a different question and deserve the worry the solids get.