EMC spring contacts or fingerstock are originally made of copper beryllium (CuBe2), due to its unique combination of high electrical conductivity, excellent resilience and mechanical strength. This made it the gold standard for EMI/RFI shielding in demanding applications such as aerospace, defense and telecommunications for a long time.
However, copper beryllium can be toxic when processed and may pose health risks. Stricter regulations have restricted its use in many industries.
As safe alternatives, EMC spring contacts made of stainless steel (stainless steel), titanium-copper (CuTi) and phosphor bronze (CuSn) fingerstock can be used, depending on the specific requirements of the application, such as conductivity, resilience, corrosion resistance and mechanical strength.
Choose stainless steel versions when strength, wear resistance, and extreme environmental resistance are required and EMI shielding is less critical.
Choose titanium-copper fingerstock when high EMI shielding, flexibility and resilience are essential, and mechanical stress is less extreme.
Choose phosphor bronze for applications where a balance between cost and shielding is required.
These spring contacts are available in several standard strip lengths, on a roll or cut to size. The surface can also be coated with a finish of tin, zinc, nickel, gold or silver.
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