| 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 | >0.44~0.98 | - | ±3 | ±4 | - | - | - | | 18 | >0.98~4.85 | ±2 | ±2.5 | ±3 | - | - | - | | 40 | >4.85~19.39 | ±1.5 | ±2.0 | ±2.5 | - | - | - | | 80 | >19.39~272.71 | ±1.0 | ±1.5 | ±2.0 | - | - | - | | 300 | >272.71~371.79 | - | ±1.0 | ±1.5 | - | - | - | | 350 | - | - | ±1.5 | ±2.0 | ±2.5 | | 500 | - | - | ±1.0 | ±1.5 | ±2.0 |
|
