tungsten grinding disc
US $4.00
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WT20 2.4*175mm tungsten electrode
Thoriated tungsten electrode
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| Designation | Oxide additive category | Oxide additive content % | Color sign |
| WT10 | ThO2 | 0.8-1.2 | Yellow |
| WT20 | ThO2 | 1.7-2.2 | Red |
| WT30 | ThO2 | 2.8-3.2 | Violet |
| WT40 | ThO2 | 3.8-4.2 | Orange |











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