tantalum bar ASTM B365 standard:ASTM B365 RO5200,RO5400 RO5252 (Ta-2.5W) RO5255 ... ) purity:99.95%,99.99% ISO9001:2008 tantalum bar ASTM B365Introduction:Tantalum is dark, dense, ductile, very hard, ... products is available in a wide range of forms including nut, screw ,ring ,wire, foil, sheet, rod, strip, ... plate, tube, alloys according to Standard ASTM AMS ASME MIL DMS JIS GB, etc.As a DNV ...