ASTM Standard Ground Finish Pure Tungsten Wire Wolfram Wires 0.01mm - 3.0mm
Tungsten has high tensile strength and good creep resistance. However, its high density, poor low-temperature ductility, and strong reactivity in air limit its usefulness. Maximum service temperatures for tungsten range from 1925 to 2500°C (3500 to 4500°F), but surface protection is required for use in air at these temperatures.
Features of Ground Tungsten Wire:
Purity 99.95% W
Melting point 3410 °C
Density 19.17 g/cm3
Specific electrical 0.055 Ohm x mm2/m
resistance at 20 °C
Modulus of elasticity 410 kN/mm2at 20 °C
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 producing heating elements used in vaccum metalizing or plating
Advantages of Ground Tungsten Wire:
The Tungsten wire is smooth, free of twists, bends, kinks, curls, and as free of dents, swaging marks, scratches, die marks, laps, seams, splits, slivers, inclusions, bumps, pits, grooves, cracks, and other physical defects Unless black finish is specified, all types of wire have a clean finish, free of graphite, grease, oil, and lubricants. Wire for hooks, supports, springs, anchors, and mesh have a bright smooth surface free of cracks holes, or craters. The requirements for straightness, and coiling and spooling are detailed as well.
Ground Tungsten Wire Chemical Composition:
| Type | Purity of tungsten | Type | Application |
| WAl1 | ≥99.92 | T | Double – screwy filament. Filament for high colour temperature lamp and shockproof lamp etc. |
| L | Filament for incandescent lamp. Cathode for emitting tube. High temperature electrodes. Twisted tungsten wire etc. |
| W | Folded – heater for electronic tube, etc. |
| WAl2 | ≥99.92 | T | Filament for fluorescent lamp etc. |
| L | Heater for electronic tube. Filament for incandescent lamp. Twisted tungsten wire etc. |
| W | Folded – heater for electronic tube, etc. |
| WAl3 | ≥99.92 | L | Filament for normal lamp. Spring wire for semiconductors, etc. |
Tungsten Wire Size Chart:
| Diameter (μm) | Weight of 200mm length | Weight tolerance of 200mm length % | Diameter Tolerance % |
| 0 Grade | Ⅰ rade | Ⅱ rade | 0 Grade | Ⅰ rade | Ⅱ rade |
| 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±2 | | ±2.0 | ±2.5 | - | -- | - |
| 80<d≤300 | >19.39-272.71 | ±2 | | ±1.5 | - | - | - |
| 300<d≤350 | >272.71-371.19 | | ±1.0 | ±1.5 | - | - | - |
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ASTM Ground Pure Tungsten Wire Wolfram Wire 0.01mm 3.0mm 19.2g/cc Images
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