A.L.M.T. Corp.

Tungsten wires

Used for filament for lighting, electron tube, electrode, high-temperature furnace parts

Tungsten wire is used as filaments for lighting, electron tubes, electrodes, high-temperature furnace parts, probe pins, etc. by making the most of its characteristics: the highest melting point among metals. Customers can choose a variety of wire diameters, materials and finishing method for various applications.
We also offer the world’s highest level high-purity tungsten wire by our integrated production strictly controlled raw material and processes.

照明用フィラメント、電子管、電極、高温炉部材などの用途に活用

Product selection guide

AW Features excellent high-temperature deformation resistance, blackening resistance, shocking resistance, less impurity gas, and long life.
AX Compared with conventional materials, the recrystallization temperature is higher (50° to 200°C), dope hole is smaller, crystal structure after recrystallization is 3 to 4 times longer, and non-sagging performance is greatly improved.
EX World’s first grade filament material. It contains less impurity gas, excels in high temperature deformation resistance and corrosion resistance against evaporated metals including Al, Ni, Cr; has a long life.
DW Long lifetime tungsten that facilitates emission of thermo-electrons and prevents grain growth and integranular fracture at thermionic emission temperature. We respond to coil processing, tip processing, and assembly processing upon your request.

CY(PFW) The most common pure tungsten material with good workability, excellent corrosion resistance, and less impurity gas contained.
EP,KT Dramatically reduces discharge consumption resistance by finely dispersing crystal grains.
4N-W

5N-W
World’s highest grade high-purity tungsten        
Purity 4N-W ≧99.99%  5N-W ≧99.999%

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Application Non-sag shock
resistance
Machinability Discharge
ability
Discharge
consumption
resistance
Wear
resistance
Corrosion
resistance
(VM)
AW Filament for halogen lamps (thinner),
Grids, Supports, Heaters and Corona wires
AX  Filaments for ultrahigh temperature
halogen lamps (thicker)
EX Vaccum evaporation, Heaters for
high-temperature furnaces, Print wires
for printers, Supports, Discharge
electrodes and Probe pins
DW Electrodes, EDM wires and Filaments
for thermionic emission
CY
(PFW)
Structural materials and Heaters for
furnaces
EP Discharge electrodes, Structural materials, Pressure welded electrode
KT Discharge electrodes, Structural
materials
4N-W
5N-W
Electrodes, Heaters

Standard specifications of tungsten wires

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Diameter range
(mm)
material Representative spec
AW AX CY
EX
4N-W
5N-W
Finish Tolerance
diameter
Tolerance
MG
Black CC Electrolytic Straight
to 0.0129               ±0.005mm ±4%
0.013 to 0.029           ±0.005mm ±3%
0.03 to 0.14         ±0.005mm ±2%
0.15 to 0.39     ±0.005mm ±2%
0.40 to 0.49     ±0.01mm ±2%
0.50 to 0.59     ±0.02mm  
0.60 to 0.79   ±0.03mm  
0.80 to 0.99       ±0.03mm  
1.0 to 1.2         ±0.04mm  
1.3 to 2.0                 ±0.04mm  
2.1 to 3.2                 ±0.05mm  

Purity of tungsten wire

Type W %
AW, AX, EX, CY, EP, KT 99.95min.
DW 99.20min.
4N-W 99.99min.
5N-W 99.999min.