4J32 alloy wire is a precision iron-nickel-cobalt alloy with a controlled coefficient of thermal expansion. It offers excellent dimensional stability, good mechanical strength, and outstanding workability, making it an ideal material for applications requiring reliable glass-to-metal sealing and thermal expansion matching.

The thermal expansion characteristics of 4J32 are well matched with specific hard glasses and ceramic materials, ensuring excellent sealing performance and long-term reliability under varying temperature conditions. It is widely used in electronic components, vacuum devices, semiconductor packaging, relays, hermetic connectors, precision instruments, aerospace equipment, and other high-reliability applications.

Our 4J32 alloy wire is manufactured under strict quality control to ensure consistent chemical composition, precise dimensional tolerance, excellent surface finish, and stable physical properties. We can supply various wire diameters and tempers (annealed, semi-hard, and hard) according to customer requirements, with customized specifications available for different industrial applications.

1. Chemical Composition:

2. Technical Specifications:

3. Production Attributes

4. Applications

• Glass-to-metal sealing components
• Hermetic connectors and feedthroughs
• Electronic lead wires and pins
• Vacuum electronic devices
• Semiconductor packaging components
• Integrated circuit (IC) and sensor packages
• Relays and electrical switches
• Precision measuring instruments
• Thermostats and temperature control devices
• Aerospace and high-reliability electronic components

5. Key features

• Low and stable coefficient of thermal expansion (CTE)
• Excellent dimensional stability
• Superior glass-to-metal sealing performance
• Good mechanical strength and toughness
• Excellent cold working capability
• Consistent chemical composition and physical properties
• Available in various sizes and conditions
• Good corrosion resistance