... Tantalum,Niobium ,Tantalum alloy and Niobium alloy, series of products are available in all forms such as foils, sheets, wires, rods, bars, plates, seamless ... Diameter x random length, 90% tantalum, 10% tungsten, as per ASTM B365-92 R05255; - Tantalum alloy (Ta2. 5% W, Ta-2. 5w ... Wall thickness x Length 6 meters max. Tantalum 97. 5% , Tungsten 2. 5% , as per ASTM B521-98 R05252; Special requirements ...