Chemical composition:
| Main and minor components | Min.content(%) |
| W | Balance |
| La | 0.95-0.95% |
| La2O3 | 1.1-1.15% |
| Impurities | Max.values (μg/g) |
| Al | 15 |
| Cu | 10 |
| Cr | 20 |
| Fe | 30 |
| K | 10 |
| Ni | 20 |
| Si | 20 |
| Mo | 100 |
| C | 30 |
| H | 5 |
| N | 5 |
| Cd | 5 |
| Hg | 1 |
| Pb | 5 |
Diameter and tolerances:
| Diameter (mm) | Tolerance (mm) |
| 1.00-2.39 | ±0.05 |
| 2.40-2.99 | ±0.08 |
| 3.0-10.0 | ±0.10 |
Length and tolerance:
| Length (mm) | Tolerance (mm) |
| 50 | ±1.5 |
| 75 | +2.5/-1.0 |
| 150 | +4.0/-1.0 |
| 175 | +6.0/-1.0 |
| 300 | +8.0/-1.0 |
| 450 | +8.0/-1.0 |
| 600 | +13.0/-1.0 |
Straihtness(mm): max. deviation 0.5/100 mm length
Thermal treament: unannealed
Density: ≥18.5g/cm³
Surface: centerless ground