There is a Contact RFI that contains materials from Beryllium Copper.It is possible for the EMI/RFI to operate normally at -40°C~121°C.A contacter RFI with the Fingerstock type.
56-70000 Features
Fingerstock
56-70000 Applications
There are a lot of Parker Chomerics 56-70000 RFI and EMI Contacts applications.