COPPER ALLOY No. 220, previously called Commercial Bronze, 90%, is a copper-zinc alloy having good formability and resistance to stress-corrosion cracking. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-254. Producer or source: Brass mills.