Black Tungsten Wire 


What is Black Tungsten Wire?


Black Tungsten Wires are graphite-coated tungsten wires used in cathodes, incandescent lamp filaments, and heating elements. Black tungsten wires are available in multiple sizes and are generally immediately available in most volumes, including bulk quantities. Bless can produce materials to custom specifications by request, in addition to custom compositions for commercial and research applications and new proprietary technologies. Bless also casts any of the rare earth metals and most other advanced materials into rod, bar or plate form, as well as numerous other machined shapes and in the form of solutions and organometallic compounds. Ultra high purity and high purity forms also include metal powdersubmicron powder and nanomaterialstargets for thin film deposition, and pellets for chemical vapor deposition (CVD) and physical vapor deposition (PVD) applications. Bless produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available, as is additional technical and safety (MSDS) data. Please contact us for information on lead time and pricing above.


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Capacity of Tungten Black Wire



Purity of black tungsten wire:99.95%;

Black tungsten wire brand: W-1, W-2, WAL-A, WAL-2;

Properties of black tungsten wire: non-sag; good wearing, high temperature resistance, formation under high temperature; good winding;excellent coiled ability;

Surface treament: alkali washing surface or black surface;


Application of Black Tungsten Wire:

*Used for making fluorescent lamp, auto lamp, incandscent lamp and halogen lamp, etc;

*Applicated for making many kinds of filaments, such as coiled-coil or triple CFL filament, shock-resistance filament, incandscent filament or high-temperature-resistance filament,etc;

*For producing electron tubes;

*Used for manufacturing anti-shock devices, temperature-resistance devices, etc;





Black Tungsten Wire Properties

Molecular Weight




Melting Point

3410 °C

Boiling Point

5900 °C


19.3 g/cm3

Thermal Expansion

(25 °C) 4.5 µm·m-1·K-1

Tensile Strength

750 MPa

Thermal Conductivity

1.73 W/m K

Young's Modulus

411 GPa

Vickers Hardness

3430 MPa

Poisson's Ratio


Electrical Resistivity

5.65 μΩ ·m (27 °C)


1.7 Paulings

Specific Heat

0.133 J/g mol (20 °C)

Heat of Vaporization

806.7 kJ/mol


Do not hesitate to contact one of our representatives