Copper Alloy No. C81400 is a precipitation-hardenable alloy of moderate hardness and strength. Its common name is beryllium-modified chromium copper and a previous trade name was Beryllium Copper 70C. Because of its beryllium content, its manufacture may present a health hazard. Typical uses comprise electrical parts that meet RWMA (Resistance Wire Manufacturer's Association) Class II standards. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on casting, heat treating, machining, and joining. Filing Code: Cu-504. Producer or source: Copper alloy foundries.