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Grade 1 Tungsten Spooled Wire
Available Configurations
Properties common to all products in this list
| Length | Other Variant |
|---|---|
| 1m to 4,800m |
CP Spooled CP Straight |
Need custom configurations? Please contact us.
Key Features
Grade 1 Tungsten Spooled Wire at 99.95% purity is a 0.05 mm diameter clean-surface refractory wire supplied on spool for precision winding and automated filament fabrication:
Clean Surface — Drawing Lubricant Residues Removed
Lubricant-free surface is essential for vacuum applications where contamination degrades emission or causes outgassing. This is the standard wire for thermionic cathode heaters, vacuum lamp filaments, and electron gun components where purity and surface cleanliness are both required.
Tensile Strength 1920 MPa — Coil Integrity Through Thermal Cycling
Hard-drawn strength maintains coil geometry through repeated thermal excursions in cathode heater, vacuum lamp, and resistance element applications, where wire failure during cycling terminates device life.
Very Low Vapor Pressure — Long Service Life in Vacuum
Negligible evaporative mass loss prevents vacuum contamination, protects adjacent components, and avoids progressive cross-section thinning that would otherwise shorten filament life in high-vacuum discharge devices.
0.05 mm Diameter Spool Format — Continuous Winding & Automated Feed
Consistent diameter and surface condition across the full spool length support high-throughput production of cathode heaters, HID lamp filaments, and vacuum furnace resistance elements on precision winding machines.
Highest Melting Point of Any Element — Reliable Thermionic Performance
Structural stability at sustained operating temperatures ensures freedom from failure, surface degradation, and emission instability across device lifetime in cathode heater and electron gun applications.
Research Applications
Used for custom emission filaments, ion source heaters in mass spectrometry and ion implantation, and as a refractory wire substrate for surface modification and thin-film deposition studies.
Industrial Applications
Grade 1 Tungsten Spooled Wire is used wherever continuous clean-surface refractory wire at consistent 0.05 mm diameter is required for precision winding and automated filament production:
- ✦ Thermionic Cathode Heater Coils
- Clean surface eliminates outgassing contaminants, 0.05 mm diameter supports tight-pitch winding, and 1920 MPa tensile strength maintains coil geometry through high-temperature cycling in electron guns, X-ray cathodes, and vacuum discharge devices.
- ✦ Vacuum Lamp & High-Intensity Discharge Lamp Filaments
- Spooled format enables continuous automated winding; clean surface minimizes early-life outgassing in sealed envelopes; very low vapor pressure maximizes service life by limiting evaporative mass loss at operating temperature.
- ✦ Electron Gun Components in Semiconductor Process Equipment
- Surface cleanliness meets process-critical requirements in e-beam evaporators, electron beam lithography systems, and ion implantation sources; spooled format supports consistent automated fabrication of precision-wound assemblies.
- ✦ Vacuum Furnace Resistance Elements
- Maximum melting point, very low vapor pressure, and high tensile strength combine to give long-life elements that hold their wound geometry without contaminating the furnace atmosphere during sustained high-temperature operation.
- ✦ Research: Emission Filaments, Ion Source Heaters & Thin-Film Deposition
- Continuous spool length supports iterative filament design, winding parameter optimization, and systematic thin-film deposition experiments on refractory metal wire substrates in mass spectrometry, ion implantation, and surface science research.
Material Properties
| Element | Value |
|---|---|
| Atomic number | 74 |
| Crystal structure | Body centred cubic |
| Electronic structure | Xe 4f¹⁴ 5d⁴ 6s² |
| Valences shown | 2,3,4,5,6 |
| Atomic weight( amu ) | 183.85 |
| Thermal neutron absorption cross-section( Barns ) | 18.5 |
| Photo-electric work function( eV ) | 4.55 |
| Natural isotope distribution( Mass No./% ) | 183/ 14.3 |
| Natural isotope distribution( Mass No./% ) | 182/ 26.3 |
| Natural isotope distribution( Mass No./% ) | 186/ 28.6 |
| Natural isotope distribution( Mass No./% ) | 180/ 0.1 |
| Natural isotope distribution( Mass No./% ) | 184/ 30.7 |
| Atomic radius - Goldschmidt( nm ) | 0.141 |
| Ionisation potential( No./eV ) | 1/ 7.98 |
| Ionisation potential( No./eV ) | 2/ 17.7 |
| Element | Value |
|---|---|
| Material condition | Soft |
| Material condition | Hard |
| Poisson's ratio | 0.28 |
| Poisson's ratio | 0.28 |
| Bulk modulus( GPa ) | 311 |
| Bulk modulus( GPa ) | 311 |
| Tensile modulus( GPa ) | 411 |
| Tensile modulus( GPa ) | 411 |
| Hardness - Vickers( kgf mm⁻² ) | 360 |
| Hardness - Vickers( kgf mm⁻² ) | 500 |
| Tensile strength( MPa ) | 550-620 |
| Tensile strength( MPa ) | 1920 |
| Yield strength( MPa ) | 550 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 5.4@20°C |
| Superconductivity critical temperature( K ) | 0.0154 |
| Temperature coefficient( K⁻¹ ) | 0.0048@0-100°C |
| Thermal emf against Pt (cold 0C - hot 100C)( mV ) | 1.12 |
| Element | Value |
|---|---|
| Boiling point( C ) | 5660 |
| Density( gcm⁻³ ) | 19.3@20°C |
| Element | Value |
|---|---|
| Melting point( C ) | 3410 |
| Latent heat of evaporation( J g⁻¹ ) | 4009 |
| Latent heat of fusion( J g⁻¹ ) | 192 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 133@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 173@0-100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 4.5@0-100°C |
Tolerances
| Diameter | ±10% | |
|---|---|---|
| Length | +5% / -1% |