Applications: For producing electric light source parts and electric vaccum components For producing heating elements and refractory parts in high temperature furnaces For producing heating elements used in vaccum metalizing or plating
Appearance: W-wire is regular black covered with graphite. After graphite is removed it is metallic luster.Chemical Composition:
| Designation | Tungsten Content | Impurity Elements Content |
| Total | Each |
| WAL1, WAL2 | ≥99.95% | ≤0.05% | ≤0.01% |
| W1 | ≥99.95% | ≤0.05% | ≤0.01% |
| W2 | ≥99.92% | ≤0.08% | ≤0.01% |
| Note: Potassium is not counted in impurities content. |
Diameter tolerance(%):
| Diameter (μm) | Weight (mg/200mm) | Weight(mg/200mm) Tolerance(%) | Diameter Tolerance(%) |
| Grade 0 | Grade 1 | Grade 2 | Grade 0 | Grade 1 | Grade 2 |
| 5≤d≤12 | 0.075~0.44 | － | ±4 | ±5 | － | － | － |
| 12<d≤18< td=""> | >0.44~0.98 | － | ±3 | ±4 | － | － | － |
| 18<d≤40< td=""> | >0.98~4.85 | ±2 | ±2.5 | ±3 | － | － | － |
| 40<d≤80< td=""> | >4.85~19.39 | ±1.5 | ±2.0 | ±2.5 | － | － | － |
| 80<d≤300< td=""> | >19.39~272.71 | ±1.0 | ±1.5 | ±2.0 | － | － | － |
| 300<d≤350< td=""> | >272.71~371.79 | － | ±1.0 | ±1.5 | － | － | － |
| 350<d≤500< td=""> | － | － | ±1.5 | ±2.0 | ±2.5 |
| 500<d≤1800< td=""> | － | － | ±1.0 | ±1.5 | ±2.0 |
