Daan

I don't think the storage at -50 deg. does harm your equipment too much.
Just be sure it is sealed in dry gas or vacuum. I have one thought: Tin has
a transition temperature of +13 deg. from tetragonal ( metallic tin ) to
cubic (tinpest). This effect is very slow, but if one is storing electronic
equipment for years at low temperatures it might at least have a cosmetic
effect on the solder joints. And if the PCB's are coated ( as usual in
military applications )  this will look really ugly.

Best regards

Guenter Grossmann
Swiss Federal Institute for Materials Testing and Research
Center for Reliability
Duebendorf
Switzerland
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