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Tungsten Coil
Available Configurations
Properties common to all products in this list
| Purity | Thickness | Width | Length | Temper Options | Surface Finish Options | Other Variants |
|---|---|---|---|---|---|---|
| 99.9% (3N) 99.96% (3N6) | 0.006mm to 101.6mm (plate) | 7mm to 500mm | 7mm to 1000mm | As Rolled | Polished on one side | Non Light Tested (99.95% W) |
Need custom configurations? Please contact us.
Key Features
Tungsten Coil at 99.95% purity provides the metal with the highest melting point of any element — 3,410 °C — combined with one of the lowest vapor pressures in the periodic table, in a continuous rolled format suited to winding, cutting, and forming into heating elements, radiation shields, and electron emitter structures:
Highest Melting Point of Any Element (3,410 °C) & Ultra-Low Vapor Pressure
With a melting point of 3,410 °C and one of the lowest vapor pressures of any element at elevated temperatures, Tungsten Coil sustains thermal load and maintains vacuum integrity in high-temperature vacuum furnace heaters, incandescent and halogen lamp filaments, and plasma-facing components where no other metal coil is capable of reliable service.
High Tensile Strength: 550–620 MPa (Annealed) to 1,920 MPa (Hard-Drawn)
Annealed Tungsten Coil offers 550–620 MPa tensile strength with improved ductility suited to winding operations; hard-drawn coil reaches 1,920 MPa with a tensile modulus of 411 GPa and Vickers hardness of 500 kgf/mm² — allowing coil form to serve both formed filament and structural heating element applications from the same material system.
Thermal Conductivity of 173 W/m·K & Low CTE (4.5 × 10⁻⁶ K⁻¹)
A thermal conductivity of 173 W/m·K supports efficient heat transfer in heating element and heat shield applications, while a coefficient of thermal expansion of just 4.5 × 10⁻⁶ K⁻¹ ensures that formed components maintain dimensional accuracy through repeated thermal cycling — a property critical in precision furnace and vacuum system components.
Defined Photoelectric Work Function (4.55 eV) for Electron Emission Applications
A well-characterized photoelectric work function of 4.55 eV and defined thermionic emission behavior make Tungsten Coil the standard material for thermionic electron emitters, vacuum tube cathode structures, and field emission device fabrication, where reproducible and specification-controlled electron emission properties are required.
High Density (19.3 g/cm³) for Radiation Shielding & Structural Applications
With a density of 19.3 g/cm³, Tungsten Coil provides radiation attenuation and mechanical mass in a compact cross-section — supporting its use in radiation shield windings and as a reproducible, high-purity refractory substrate for high-temperature materials testing, catalytic surface studies, and sintering system development in research environments.
Industrial Applications
Tungsten Coil is used across lighting, vacuum technology, thermionic emission, fusion research, and high-temperature processing wherever a continuously formed refractory metal strip must sustain extreme thermal load without loss of structural or vacuum integrity:
- ✦ Incandescent & Halogen Lamp Filaments
- The standard filament material in incandescent and halogen lamps, where a melting point of 3,410 °C and extremely low vapor pressure allow the filament to operate at temperatures that produce visible light without evaporative loss that would shorten service life — properties no other elemental metal can match at operating temperature.
- ✦ High-Temperature Vacuum Furnace Heating Elements
- Wound into heating elements for high-temperature vacuum furnaces, where thermal conductivity of 173 W/m·K ensures uniform heat distribution and the combination of high melting point and ultra-low vapor pressure guarantees both operating temperature capability and vacuum system cleanliness across extended furnace campaigns.
- ✦ Thermionic Electron Emitters & Vacuum Tube Cathodes
- Used in thermionic electron emitters and vacuum tube cathode structures, where a photoelectric work function of 4.55 eV and well-characterized emission behavior provide the reproducible electron emission properties required for reliable, specification-controlled electron sources in vacuum electronic devices.
- ✦ Plasma-Facing Components in Fusion Research
- Employed as plasma-facing components in fusion research devices, where the combination of the highest melting point, lowest vapor pressure, and highest density of any elemental metal coil ensures structural survival and minimal plasma contamination under the extreme particle and heat flux conditions of fusion plasmas.
- ✦ Refractory Substrate for High-Temperature Materials Research
- Used in research as a reproducible, high-purity refractory substrate for high-temperature materials testing, catalytic surface studies, and sintering system development, where a specification-controlled tungsten strip provides a well-characterized, dimensionally consistent platform for experiments at temperatures beyond the capability of any other elemental metal.
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
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Coil Width | <100mm | ±1mm |
| Coil Width | >=100mm | +2% / -1% |
| Length | +10% / -0% |