Tungsten rod
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 Type & Application
| Type |
Application |
| W91 W71 W61 |
Applied for making filament, cathodes, setting rod at H.t., electrode etc. |
| W31 W42 W11 |
Applied for making lead, support, typing needle. |
Diameter Range
| Classification |
Dia min |
Dia max |
| black W rod |
swaged |
3.0 |
13.5 |
| straightened |
0.5 |
3.0 |
| ground W rod |
1.0 |
13.5 |
Chemical Composition
| WF |
Fe |
Mo |
other element |
| >99.95 |
<=0.0020 |
<=0.0030 |
<=0.0010 |
Note: "K" is not regarded as impurity.
Diameter Tolerance
| diameter |
Black W rod |
ground W rod |
length tolerance |
| Diameter tolerance |
roundness |
diameter tolerance |
roundness |
| 0.5<d<=0.8 |
±2 |
2 |
- |
- |
L<=50¡¡±0.5
50<L<=100 ±1.0
100<L<=300 ±1.5
300<L<=500 ±2.0
500<L<=1000 ±2.5
1000<L<=2000 ±5 |
| 0.8<d<=3.0 |
±2 |
2 |
±0.03 |
0.03 |
| 3.0<d<=6.5 |
±2 |
2 |
±0.05 |
0.05 |
| 6.5<d<=13.5 |
±2 |
2 |
±0.08 |
0.08 |
|
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