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NiCr8020 Wire

Nickel Alloy
May 21, 2025
Category Connection: Low Expansion Alloy
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Tags:
#Feni52 Wire #Alloy 42 Invar Strip #Kovar Rod
Brief: Discover the high precision 4J29 alloy wire, also known as Kovar-type wire, perfect for glass-to-metal hermetic sealing in electronic and aerospace applications. With controlled thermal expansion matching borosilicate glass, this Fe-Ni-Co sealing alloy ensures reliable performance in vacuum relays, infrared sensors, and more.
Related Product Features:
  • 4J29 alloy wire offers excellent thermal expansion compatibility with hard glass, ideal for hermetic sealing.
  • Contains approximately 29% nickel and 17% cobalt for controlled thermal expansion.
  • Available in diameters from 0.02 mm to 3.0 mm, with bright, smooth, oxidation-free surface.
  • Good weldability and high dimensional accuracy for precise applications.
  • Stable magnetic properties under various environmental conditions.
  • Custom diameters and packaging options available to meet specific needs.
  • Widely used in electronic tubes, vacuum relays, and aerospace-grade components.
  • Supplied in plastic spools, coils, or vacuum-sealed bags with anti-rust packaging options.
Faqs:
  • What is the thermal expansion coefficient of 4J29 alloy wire?
    The thermal expansion coefficient of 4J29 alloy wire is approximately 5.0 x 10⁻⁶ /°C within the range of 30 -300°C, making it compatible with borosilicate glass.
  • What are the typical applications of 4J29 alloy wire?
    4J29 alloy wire is commonly used in vacuum relays, infrared and microwave device packaging, glass-to-metal feedthroughs, electronic tubes, and hermetically sealed aerospace components.
  • How is the 4J29 alloy wire packaged and shipped?
    The wire is supplied in plastic spools, coils, or vacuum-sealed bags with optional anti-rust and anti-moisture packaging. Shipping is available by air, sea, or express, with delivery times ranging from 7-15 working days depending on quantity.
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