AVAILABILITY of wide refractory metal and alloy sheet -£*as a commercial mill product has become a reality during the past two years. As recently as four years ago, Mo-0.5 Ti was the only alloy available as large sheet, whereas today 23 different alloys are offered commercially by 11 producers. In the present paper, a commercially available alloy is defined as one in which sheet of 12-in. minimum width is marketed as a standard mill product. With few exceptions, each metal or alloy is available from at least one producer in widths of 24-36 in. and lengths of 72-96 in. Certain of the Cband Ta-base alloys can be produced as 40X 96-in. flat sheet. Refractory metal and alloy foil (0.005-in. thick) have become available in widths up to 12-in. during the past year. Foil that is up to 24-in. wide is being produced experimentally under Air Force contract, and several Cb-base alloys are available as commercial products today. A major effort is being given to the production of wide foil, particularly in Cband Ta-base alloys, for use in lightweight sandwichpanel construction. In this paper the current status of such commercially produced sheets as columbium, molybdenum, tantalum, tungsten, and their alloys are summarized. The information and data presented have been obtained from the 11 domestic producers of these materials or from open published literature. The availability section lists the maximum sizes of sheet produced at thicknesses of 0.060, 0.030, 0.010, and 0.002-in. The principal alloys of interest for aerospace applications are characterized in terms of composition, size availability, and cost. The current level of quality and activities designed to improve quality are discussed. The properties section presents, in a tabular and graphical manner, a summary of the typical mechanical properties of these materials. Emphasis is placed on tensile strength and stress-rupture properties. Properties of alloys in one class, i.e.,