Style: 99.95% Tantalum Wire Grade: R05200, R05400, Ta2.5W, Ta10W Standard: ASTM B365 Certification: ... as follows: R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both, R05400, unalloyed tantalum, powder-metallurgy consolidation, R05255 ... alloy, 60 % tantalum 40 % columbium, electron-beam furnace or vacuum-arc melt, or both.Permissible variations in diameter for wires Diameter ...