Tungsten wires

Applications include lighting, electrodes, and components for high-temperature furnaces.
Leveraging its status as the metal with the highest melting point, tungsten is utilized for lighting filaments, electron tubes, electrodes, components in high-temperature furnaces, probe pins, and various other applications. We offer a wide range of wire diameters, materials, and finishes to meet your specifications. Additionally, we provide tungsten wires with the world's highest purity, achieved through strict control of raw materials and processes, benefiting from our integrated production system.

Applications Filaments for halogen lamps, electrodes for projector lamps,
etc.

Product selection guide

AW It exhibits excellent resistance to high-temperature deformation, blackening, and shock, ensuring a long service life due to its low content of impurity gases.
AX Compared to conventional materials, the recrystallization temperature is 50 to 200℃ higher, the doped pores are smaller, and the crystal structure length after recrystallization is 3 to 4 times longer, significantly improving nonsagging properties.
EX It contains minimal impurity gases and demonstrates excellent resistance to high-temperature deformation and corrosion from deposited metals such as Al, Ni, and Cr. This ensures a long service life, making it one of the world’s premier filament materials.
DW Long-life tungsten facilitates thermal electron generation and prevents grain growth and grain boundary cracking at thermal electron emission temperatures. Coil processing, tip processing, and assembly processing are also available upon request.
CY（PFW） This is the most common pure tungsten material, exhibiting good workability, excellent corrosion resistance, and low impurity gas content.
EP, KT The fine dispersion of crystal grains significantly reduces the resistance to discharge consumption.
4N-W Tungsten with reduced impurities, achieving a purity of 99.99% or higher.
5N-W This is the world’s highest purity tungsten, achieving a purity of 99.999% or higher by reducing impurities to the utmost limit. in various discharge lamps and in advanced technology fields where minimal impurity levels are critical.

スクロールで表全体をご覧いただけます。

Materials Application Non-sag Shock
resistance		 Machinability Dischargeability Discharge consumption resistance Abrasion resistance Corrosion resistance (VM)
AW Filaments for halogen lamps, grids, supports, heaters, electrified wires Excellent Good Good Average Good Good Average
AX Filaments for ultra high temperature halogen lamps (for thick and medium wires) Excellent Excellent Excellent Average Good Good Average
EX Vacuum deposition, high-temperature furnace heaters, printer printing wires, supports, discharge electrodes, probe pins Good Good Excellent Average Excellent Excellent Excellent
DW Electrodes, charged wire thermal electron emission filaments Good Excellent Excellent Excellent Excellent Good Average
CY
（PFW）		 Structural and furnace heaters Average Average Excellent Average Average Good Excellent
EP Discharge electrodes, structural materials,

welding

welding electrodes		 Good Average Excellent Average Excellent Excellent Average
KT Discharge electrodes, structural materials Good Average Excellent Average Excellent Excellent Average
4N-W
5N-W		 Electrodes, heaters Average Average Excellent Average Good Excellent Good

Standard specifications of tungsten wires

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

Purity of tungsten wire and rod

Materials Purity（%）
AW, AX, EX, CY, EP, KT 99.95 min.
DW 99.20 min.
4N-W 99.99 min.
5N-W 99.999 min.
Tungsten technical information