Wintering your Flow Hive / Flow Frames


I happened across this thread where Flow states exactly which plastics are in the Flow Frames:

That seems to indicate PETG on the ends, which falls into number 1 and has a temp range of -40c to 70c, and number 5 (PP) for the comb, which means 0c to 135c.

Everything I can find on PP states that is remains chemically viable at temperatures below zero but becomes very brittle and glass-like. So as long as they are handled with extreme care in the deep-freeze, all should be OK. PP is used for freezing organic samples at cryogenic temperatures.