ECLIPSALOY 520 is a fine-grain magnesium sand casting alloy containing zinc and zirconium. It is recommended where high strength is required. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Mg-50. Producer or source: Bendix Aviation Corporation.