Cu is listed as a Balance element for this material, but its % value is not listed in the specification. The value shown is a calculated one.

Cast: 45,000-50,000 TS; 30,000-35,000 YS; 17-22 El; 40 RA; 120-140 HB; For circuit breakers, contacts, electrode jaws; corrosion resistant, age hardenable.