Official Answer
Answer
Beryllium Copper (C17200) offers a unique combination of high mechanical strength (approaching that of steel) and excellent electrical conductivity (approx. $20\%$-$25\%$ IACS). In EMI/RFI shielding, the wave spring acts as both a mechanical loader and an electrical contact. The low modulus of elasticity ($E \approx 125 \text{ GPa}$) allows for a more compliant spring compared to stainless steel, which is useful for accommodating large tolerances in electronic enclosures. Furthermore, CuBe is non-magnetic, which is essential for MRI medical equipment and sensitive avionics where magnetic interference could distort signals. Its corrosion resistance in marine environments also makes it suitable for outdoor communications hardware.
