Ferrite Cores for EMC Solutions

[Jackson1000]

I have found I need to insert a ferrite core around a cable in order for the equipment to pass EMC suspectability at 100V/M.
My question is the core is specfied down to -20C . The spec of the equipment is -40C.
What detrmental effect if any will this temerature have on the ferrite core?

 

[FvM]

You'll review material specification for the respective ferrite type, or refer to general data in text books. Most ferrites have linear (decreasing) permeability over temperature between +50 and -50 degree C, some have almost constant permeability. If you passed the EMC test with some margin, there should be no problem.