... 99.95% Tantalum Wire Grade: R05200, R05400, Ta2.5W, Ta10W Standard: ASTM B365 Certification: ISO9001 : 2008 99.95% Tantalum Wirewe can ... melt, or both, R05400, unalloyed tantalum, powder-metallurgy consolidation, R05255, tantalum alloy, 90 % tantalum 10 % tungsten, electron-beam furnace ... or vacuum-arc melt, or both, R05240 tantalum alloy, 60 % tantalum 40 % columbium, electron-beam furnace or vacuum ...