- Niobium plate(ASTM B393 - 95 R04210) Thick 0.1 up to 20mm x Width x Length - Niobium sheet(ASTM B393 - 95 R04210) Thick 0.076 up to 0.15mm x Width 5 up to 12mm x Length (500gram/spool) - Niobium foil(ASTM B393) Thick 0.05 up to 0.10mm x Width 5-13mm x Length