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Specification of Niobium Rod/Bar
| Form | Diameter (inch) | Length (inch) |
| Rod / Bar | 0.1-0.25 | 8-60 |
| 0.25-0.6 | 8-60 | |
| 0.6-1 | 8-60 | |
| 1-6 | 8-60 |
Standard of Niobium Rod/Bar
| Standard | Forms |
| ASTM B391 | Ingot |
| ASTM B392 | Bar, Rod, Wire |
| ASTM B393 | Foil, Sheet, Strip,Plate |
| ASTM B394 | Tube |