BRUSH WELLMAN S-200F is beryllium strengthened by a dispersion of beryllium oxide (1.5%). It has moderate strength and moderate ductility (A minumum of 2.0% elongation). Its uses include optical equipment, nuclear reactors, instrumentation, optical substrates, satellite structures and solar arrays. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Be-4. Producer or source: Brush Wellman Inc..