Pure Tungsten Wire

Pure Tungsten Wire is a filamentary material manufactured from high-purity metallic tungsten through a process involving powder metallurgy, pressure processing, and precision drawing. Following alkaline washing or electrolytic polishing treatments, the surface exhibits a smooth, silvery-gray metallic luster (often referred to as "white tungsten wire"). As a core material in the fields of electric light sources, the electronics industry, and high-temperature technology, distinguished by its extreme physical properties-serves as a critical solution for applications involving high loads and high precision.

1. Key Performance Indicators
(1)High melting point characteristic: The melting point is as high as 3422°C, ranking first among all metals. This characteristic enables it to maintain a solid state stable state in high-temperature environments.
(2)High density characteristic: The density is 19.25 grams per cubic centimeter, similar to that of gold, which helps reduce vibration amplitude and enhance the stability of the structure.
(3)High tensile strength characteristic: The tensile strength is within the range of 800 - 1000+ megapascals. After doping treatment, the tensile strength can exceed 1500 megapascals, possessing excellent anti-fracture ability.
(4)Low thermal expansion coefficient characteristic: The thermal expansion coefficient is 4.5 micrometers/(meter·kelvin), with minimal size changes under high-temperature conditions, providing reliable precision guarantee for precise processing.
(5)High hardness characteristic: The Mohs hardness reaches 7.5, possessing strong wear resistance, suitable for cutting hard materials.
(6)Good electrical conductivity characteristic: The resistivity is between 5.5 - 5.65 microohms·centimeter, suitable for electric light sources and electric discharge machining (EDM) fields.

2. High purity and strict quality control
(1)Chemical composition requirements: The tungsten (W) content is not less than 99.95%; the iron (Fe) content is not more than 0.0020%; the molybdenum (Mo) content is not more than 0.0030%; the total content of other impurities is not more than 0.0010%.
(2)Applicable standard range: Follow ASTM F288 - 96(2025), GB/T 4181 - 2017, JIS H4461, etc., which cover chemical composition, size tolerance, and mechanical properties, etc.

3. Rich product classification
(1)By purity classification: divided into pure tungsten wire (purity not less than 99.95%) and doped tungsten wire (such as doping with potassium, silicon or aluminum oxides to enhance high-temperature performance).
(2)By application classification: including tungsten wire for electric light sources (such as electron tubes, bulbs), cut-resistant tungsten wire (used in electrode cutting electric discharge machining, semiconductor fields), industrial heating elements, etc.
(3)By grade classification: W91/W71 (anti-vibration filament), W61/W31 (screw filament), W41/W42 (heating element), W11 (electrode lead).

1. In the field of traditional electric light sources: used to manufacture the filaments for incandescent lamps, halogen lamps and fluorescent lamps, as well as the electrodes for gas discharge lamps, to ensure the best light emission efficiency and service life.

 

2. In the electronics industry: applied in the heaters (i.e., heating elements) of vacuum tubes and cathode ray tubes, gate electrodes, support rods and other components, ensuring stable and reliable operation in a high vacuum environment.

 

3. In the high-temperature technology field: used as heating elements in high-temperature vacuum furnaces, thermocouple protective tubes, and high-temperature components in spacecraft, capable of withstanding extreme high-temperature environments.

 

4. In the precision processing field: used as electrode wires for electrical discharge machining (EDM), capable of efficiently processing hard alloys and mold steels, which are difficult to machine.

1. Flexible specification adaptation

Diameter range: Can cover from 4 microns (ultra-fine wire) to 1.8 millimeters (thick bar); Supports customization of thin wire specifications based on unit length weight (e.g., "weight per 200 millimeters").

2. Customizable grades

Provide exclusive grades such as W91, W61, W41, etc. according to application scenarios, optimizing key indicators such as vibration resistance, thermal efficiency, or wear resistance.

 

3. Full-cycle technical support

Offer material selection guidance, processing parameter optimization suggestions, and after-sales technical services to help customers effectively control R&D costs.

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