Beryllium Copper Strips, UNS C17200, Alloy 25, ASTM B196 / B194 Material is popularly known as CuBe2, C17200, BeCu, CDA 172, CB101, ISO CuBe2, CEN CW101C, beryllium bronze This alloy which contains approximately 2% of beryllium and achieves the highest mechanical strength and hardness after heat treatment of all copper beryllium alloys. In soft or slightly re-rolled condition, it exhibits exnt bending behaviour. It distinguishes itself by high fatigue strength, outstanding relaxation resistance at elevated temperatures and a unique combination of high strength and exnt electrical conductivity