tantalum bar ASTM B365 standard:ASTM B365 RO5200,RO5400 RO5252 (Ta-2.5W) RO5255 (Ta-10W) ... purity:99.95%,99.99% ISO9001:2008 tantalum bar ASTM B365Introduction:Tantalum is dark, dense, ductile, very hard, easily fabricated ... , foil, sheet, rod, strip, plate, tube, alloys according to Standard ASTM AMS ASME MIL DMS JIS GB, etc.As a DNV ...