Tungsten wire/filament/heater
is the most widely used of the refractory metals. In wire form, it is essential for the production of lighting products such as wire filament, and other goods where its high temperature properties are of use. Among its properties are a melting point of 3410° C, a low coefficient of thermal expansion and low vapor pressure at elevated temperatures, along with good electrical and thermal conductivity.
Important applications of this metal wire are for the production of coiled incandescent lamp filaments, cathode and support structures for power tubes, heating elements for high temperature furnaces and evaporation sources in metallizing processes. Thicker wire sizes, straightened, finish-ground and cut into rod pieces are widely used for glass-to-metal seal lead parts in the lighting and electronic industries
Chemical Composition of stranded tungsten wires:
| 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(um) | Weight(mg/200mm) | Weight(mg/200mm) Tolerance(%) | Diameter Tolerance(%) | ||||
| Grade0 | Grade1 | Grade2 | Grade0 | Grade1 | Grade2 | ||
| 5≤d≤12 | 0.075~0.44 | – | ±4 | ±5 | – | – | – |
| 12≤d≤18 | >0.44~0.98 | – | ±3 | ±4 | – | – | – |
| 18≤d≤40 | >0.98~4.85 | ±2 | ±2.5 | ±3 | – | – | – |
| 40≤d≤80 | >4.85~19.39 | ±1.5 | ±2.0 | ±2.5 | – | – | – |
| 80≤d≤300 | >19.39~272.71 | ±1.0 | ±1.5 | ±2.0 | – | – | – |
| 300≤d≤350 | >272.71~371.79 | – | ±1.0 | ±1.5 | – | – | – |
| 350≤d≤500 | – | – | ±1.5 | ±2.0 | ±2.5 | ||
| 500≤d≤1800 | – | – | ±1.0 | ±1.5 | ±2.0 | ||
Heavy Density
Free cutting processing
Excellent mechanical performance
High elastic modulus
Can effectively absorb xrays and gamma rays
(for the absorption of x rays, and gamma rays than lead high about 30% – 30%)
no harm to environment and health
Applications of tungsten wires
For producing electric light source parts and electric vaccum components
For producing heating elements and refractory parts in high temperature furnaces
For produ cing heating elements used in vaccum metalizing or plating
