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    Tungsten Wire

    Description of Tungsten Wire:

    Standard: ASTM B760-86
    Material: W >99.95%
    Specific electrical: 0.055 Ohm x mm2/m resistance at 20 °C.
    Modulus of elasticity: 410 kN/mm2, at 20 °C.

    Application of Tungsten Wire:

    Tungsten wire is universally used to make tungsten wire resistance for bulb, lamps. Besides, it can be used in making optical instrument, electric vacuum components, high temperature resistant parts. Tungsten wire is characterized by highest melting point, excellent electric conductivity. It has high performance in sintering and high temperature in recrystallization. For the above features, it can serve a long life in any applications.
  • Dimensions and Tolerances of tungsten wire:

    Tungsten wires diameters are generally expressed in terms of inches or mils (thousandths of an inch). For thin wires from .001 inches up to .020 inches in diameter, the diameter of the wire is measured by weight per unit length. That is, the weight expressed in mg of a 200 mm length of wire.
    The standard diameter tolerance is ± 3% of the weight measurement. Closer tolerances are available, depending upon the application for the wire product.

    Straightness of tungsten wire:

    Wire may be finished in the unstraightened or as drawn condition. Wire can also be straightened via mechanical or heat treating processes. Typically, the measure of the straightness of a tungsten wire is obtained by cutting a ten inch long piece of wire and allowing it to lie on a flat clean surface. The maximum deviation from a straight line along its length is the quantitative measure of its straightness. In general, as the degree of straightness increases, tensile strength decreases.

    Quality and Finish of tungsten wire:

    Wire is free of scratches, kinks and distortions insofar as they are harmful to the intended end use of the product. Surface finish is supplied in the black, as drawn condition, where drawing lubricants and oxides are retained on the surface; or in the cleaned condition by firing in hydrogen or electrochemical etching.

    Tungsten wire Spooling

    Wire is free of scratches, kinks and distortions insofar as they are harmful to the intended end use of the product. Surface finish is supplied in the black, as drawn condition, where drawing lubricants and oxides are retained on the surface; or in the cleaned condition by firing in hydrogen or electrochemical etching.

    Dimensions and tolerances of Tungsten wire:

    Diameter (um) Length (m) Tolerance Weight (mg/200mm) Tolerance Dia. (mm)
    10<d<=18 >0.30-1 ±3 ±4
    18<d<=40 >1-5 ±2 ±2.5 ±3
    40<d<=80 >5-19 ±1.5 ±2.0 ±2.5
    80<d<=150 >19-68 ±1.0 ±1.5 ±2.0
    150<d<=300 >68-273 ±1.0 ±1.5 ±2.0
    300<d<=350 >273-372 ±1.0 ±1.5
    350<d<=500       ±1.5 ±2.0
    500<d<=1800       ±1.0 ±1.5

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