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4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals
4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals
Specifications
Brand Name :
HUONA
Model Number :
WIRE
Certification :
ISO9001
Place of Origin :
CHINA
MOQ :
1KG
Price :
Bargain
Payment Terms :
T/T
Supply Ability :
100,000 pieces / week
Delivery Time :
a week
Packaging Details :
negotiable
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
Condition :
Annealed or cold drawn
Customization :
Available on request
Description
Precision 4J42 Wire | Low Expansion Alloy for Vacuum Devices, Sensors, and Semiconductor Packages
Attribute Value
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
Condition Annealed or cold drawn
Customization Available on request
Product Overview

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.

Chemical Composition
  • Nickel (Ni): ~42%
  • Iron (Fe): Balance
  • Minor elements: Mn, Si, C (trace amounts)
Key Specifications
  • 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
Key Features
  • 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
Applications
  • Glass-to-metal hermetic seals
  • Semiconductor lead frames
  • Electronic relay headers
  • Infrared and vacuum sensors
  • Communication devices and packaging
  • Aerospace connectors and enclosures
Packaging & Shipping
  • Vacuum packaging or plastic spools
  • Anti-corrosion treatment
  • Air/sea/express delivery available
  • Delivery time: 7-15 business days
4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals 4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals 4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals 4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals
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4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals

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Product Detail
Brand Name :
HUONA
Model Number :
WIRE
Certification :
ISO9001
Place of Origin :
CHINA
MOQ :
1KG
Price :
Bargain
Contact Supplier
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4J42 Low Expansion Alloy Wire for Vacuum Devices and Semiconductor Seals

Huona (Shanghai) New Material Co., Ltd.

Verified Supplier
2 Years
shanghai, shanghai
Since 2008
Business Type :
Manufacturer, Exporter
Main Products :
Low Expansion Alloy, Soft Magnetic Alloy, Elastic Alloy
Total Annual :
8000000-100000000
Employee Number :
100~120
Certification Level :
Verified Supplier
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