Official Answer
Answer
Beryllium Copper (Alloy 25 / UNS C17200) is used for spiral retaining rings when high electrical conductivity and non-magnetic properties are required, such as in EMI/RFI shielding or MRI machines. CuBe kan hittebehandel word om 'n treksterkte van $160-200$ ksi te bereik, vergelykbaar met sommige staalsoorte. The material's modulus $E \approx 19 \times 10^6$ psi is lower than steel, which allows for easier installation into deep grooves without permanent deformation. Verwerking moet egter versigtig hanteer word weens die toksisiteit van berilliumstof (hoewel die soliede legering veilig is). In elektronika is hierdie ringe dikwels 'goud' of 'silwer' bedek om oppervlakgeleiding verder te verbeter en oksidasie te voorkom.
