Huona (Shanghai) New Material Co., Ltd.
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4J42 wire is a precision-controlled expansion alloy composed of iron and approximately 42% nickel. It is engineered to closely match the thermal expansion of borosilicate glass and other packaging materials, making it an ideal choice for hermetic sealing, electronic packaging, and aerospace applications.
Nickel (Ni): ~42%
Iron (Fe): Balance
Minor elements: Mn, Si, C (trace amounts)
CTE (Coefficient of Thermal Expansion, 20–300°C): ~5.5–6.0 × 10⁻⁶ /°C
Density: ~8.1 g/cm³
Electrical Resistivity: ~0.75 μΩ·m
Tensile Strength: ≥ 430 MPa
Magnetic Properties: Soft magnetic, low coercivity
Diameter: 0.02 mm – 3.0 mm
Surface: Bright, oxide-free
Form: Spool, coil, cut-to-length
Condition: Annealed or cold drawn
Customization: Available on request
Matched thermal expansion for glass and ceramics
Stable mechanical and magnetic properties
Excellent vacuum compatibility
Ideal for electronic sealing, relays, and sensor leads
Low expansion with good ductility and weldability
Glass-to-metal hermetic seals
Semiconductor lead frames
Electronic relay headers
Infrared and vacuum sensors
Communication devices and packaging
Aerospace connectors and enclosures
Vacuum packaging or plastic spools
Anti-corrosion treatment
Air/sea/express delivery available
Delivery time: 7–15 business days
