Old b/w film temperature tolerances?

[HuntingSand]

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I am looking to find out the "operating" temperature of Agfa Isopan and Plena films from the 1930s. These were used by German aviators flying in rather extreme conditions (plus/minus 30 degrees C). Any spec sheets one might find somewhere? I'd be grateful for any hints. Thank you.

[TomB_tx]

I don't know about those films, but I've used common Kodak B&W films at -20F with no problems.

[HuntingSand]

Thanks all for the interest and comments (that roll of my grandfather's film yielded intriguing results!). I have a roll of Leverkusen Isopan from 1939 coming on Wednesday, but I don't think it says on the packaging what the temperature envelope is. Am trying to recreate (or, rather: re-imagine) certain conditions those aviators faced in the open cockpit of a Junkers W33 or in the unheated and unpressurized cabin of a W52.