... :GB 3628,ASTM B 386,etc. Different sizes available tantalum foil Tantalum is dark, dense, ductile, very hard, easily fabricated, ... achieved in a small volume. Because of the size and weight advantages, tantalum capacitors are attractive for portable telephones, personal computers ... a wide range of forms including nut, screw ,ring ,wire, foil, sheet, rod, strip, plate, tube, alloys according to Standard ...