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Size and tolerance of Niobium Wire
| Form | Diameter (inch) | Circular degree (°) |
| Wire | 0.008-0.02 | 0.005 |
| 0.02-0.04 | 0.01 | |
| 0.04-0.06 | 0.02 | |
| 0.05-0.12 | 0.03 |
Standard of Niobium Wire
| Standard | Forms |
| ASTM B391 | Ingot |
| ASTM B392 | Bar, Rod, Wire |
| ASTM B393 | Foil, Sheet, Strip,Plate |
| ASTM B394 | Tube |