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4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material Featured Image
  • 4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material

4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material

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Product Description

4J42 alloy rod is a Fe-Ni controlled expansion alloy containing about 42% nickel. It features a linear thermal expansion coefficient closely matching that of hard glass and ceramics, making it ideal for glass-to-metal and ceramic-to-metal sealing applications.

This alloy offers stable expansion performance, good processing properties, and excellent sealing reliability, widely used in electronic packaging, vacuum devices, and aerospace components.


  • Density: 8.1 g/cm³
  • Thermal Expansion (20–300°C): 5.3 ×10⁻⁶/°C
  • Tensile Strength: 450 MPa
  • Hardness: HB 130–160
  • Working Temp: 60°C to 400°C
  • Standard: GB/T, ASTM, IEC

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    Key Features

    • Fe-Ni controlled expansion alloy

    • Stable thermal expansion coefficient

    • Excellent sealing performance with glass/ceramic

    • Good machinability and weldability

    • Supplied in rods, wires, strips, and customized forms

    Typical Applications

    • Glass-to-metal and ceramic-to-metal seals

    • Electronic packaging housings

    • Vacuum tubes, relays, and electronic devices

    • Semiconductor device supports

    • Aerospace and precision instruments

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