用途：制造电光源和电真空零件
用作高温发热体和高温结构零件
用来制作真空蒸镀用的钨螺旋
外观：钨丝表面涂有石墨乳，呈较均匀的黑色，去掉石墨乳呈金属光泽。
化学成分：
| 牌号 | 钨含量 | 杂质总含量 | |
| 总含量 | 每个元素含量 | ||
| WAL1、WAL2 | ≧99.95% | ≦0.05% | ≦0.01% |
| W1 | ≧99.95% | ≦0.05% | ≦0.01% |
| W2 | ≧99.92% | ≦0.08% | ≦0.01% |
钨丝的直径及允许公差:
| 直径 (μm) | 200mm丝段重量 | 200mm丝段重量公差(％) | 直径公差（％） | ||||
| 0级 | Ⅰ级 | Ⅱ级 | 0级 | Ⅰ级 | Ⅱ级 | ||
| 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 |
