Wieland-K81 is a copper-tin alloy with strength and cold working characteristics that are useful in making lead-frames. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: CU-667. Producer or source: Wieland Metals Inc., Wieland-Werke AG.