Is it normal that the cell pellets from PromoCell (C‑14***) do not freeze at -20°C?

Yes. This is completely normal.
PromoCell cell pellets (C‑14***) are supplied in RNAlater^TM, and these samples do not freeze at -20°C. They remain liquid at both 4°C and -20°C.

Storage stability of RNAlater^TM samples

Room temperature: stable for up to 1 week
4°C: stable for up to 1 month
-20°C: can be stored indefinitely, even though the sample remains liquid

The liquid state at -20°C does not indicate a problem with sample integrity or stability.

Products relevant to this topic

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