- Tantalum plate, sheet(ASTM B708 - 98 R05200) Thick 0.2 up to 1.0 mm x Width up to 500mm max x Length Thick 1.0 up to 20mm x Width up to 650mm max x Length - Tantalum foil (ASTM B708 - 98 R05200) Thick 0.025 up to 0.05mm x Width 100mm max. x Length - Tantalum Strips (ASTM B708 - 98 R05200) Thick 0.05 up to 0.1mm x Width up to 130mm max. x Length