This comes from a Sport Fencing discussion group. Apparently there was a recent failure of a polycarbonate fencing mask in europe, and one of the possible claimed causes of this failure was the cyclical cooling and re-warming of the material from airline storage to room temperatures. This...
There has been a lot of discussion in the Sport Fencing community about the effects of relative cold temperatures on fencing blades and the need to "warm them up" using friction to 'Room Temperature' prior to use. The temperatures that I am referring to are between -20 degrees F and 50 degrees...