pvc resistance at -33¦C

[davidet68]

I have a skid with PVC reinforced with GRP piping. This skid will work at ambient temperature above 0°C but can be stored (before working) in an area where the minimum temperatrue could be -33°C.
I know that the materil will became very fragile at -33°C but what I would like to know is if this low temperature will damage the material permanently or if PVC will recover his characteristics when the material return to a temperature above 0°C. Where can I find some litterature on this matter?
Thanking you in advance.

Davide