Copper Alloy No. C18900 is a copper-tin-silicon-manganese alloy with low strength and high ductility in the annealed condition. Its tensile strength can reach 95,000 psi in the hard (cold-worked) condition. It is used as welding rod and filler wire for various welding processes. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-479. Producer or source: Copper and copper alloy mills.