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Factory Wire

Factory Video
June 24, 2025
Category Connection: Low Expansion Alloy
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Tags:
#Feni52 Wire #Alloy 42 Invar Strip #Kovar Rod
Brief: Discover the precision and versatility of 4j29 Ni29co17 Kovar WIRE and 4j42 Iron Nickel Constant Expansion WIRE. These high-performance alloys are engineered for glass-to-metal and ceramic-to-metal sealing, ideal for aerospace, electronics, and medical applications. Learn about their technical specifications and industry uses in this detailed overview.
Related Product Features:
  • 4J29 alloy wire, equivalent to Kovar, offers precise thermal expansion matching hard glass and ceramics.
  • Available in diameters from 0.1 mm to 6.0 mm, with options for spooled wire, straight rods, or custom lengths.
  • High tensile strength (450-750 MPa) and elongation (≥ 25%) ensure durability in demanding applications.
  • Used in electronics for transistor cans, relay headers, and integrated circuit housings.
  • 4J42 alloy provides low thermal expansion (CTE ~4.7 × 10⁻⁶ /°C) for dimensional stability across temperatures.
  • Ideal for aerospace seals, telecom components, and medical device hermetic packaging.
  • Surface finishes include bright, annealed, oxidized, and pickled options for varied industrial needs.
  • Packaged in coils, spools, or custom-cut lengths to suit specific project requirements.
Faqs:
  • What industries commonly use 4J29 and 4J42 alloy wires?
    These alloys are widely used in electronics, aerospace, telecommunications, medical devices, and vacuum systems for their precise thermal expansion properties and hermetic sealing capabilities.
  • What are the key differences between 4J29 and 4J42 alloys?
    4J29 (Kovar) is a Nickel-Iron-Cobalt alloy with a CTE of ~5.0 × 10⁻⁶ /°C, ideal for glass-to-metal sealing. 4J42 is a Nickel-Iron alloy with a lower CTE (~4.7 × 10⁻⁶ /°C), suited for applications requiring dimensional stability.
  • Can these alloys be customized for specific applications?
    Yes, both 4J29 and 4J42 alloys are available in custom diameters (0.1 mm - 6.0 mm), surface finishes, and packaging options to meet unique project requirements.
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