Product Description

4J50 alloy rod is a Fe-Ni controlled expansion alloy containing about 50% nickel.
It is widely used where a stable and low thermal expansion coefficient is required, especially for matching sealing with ceramics and certain glasses.

The alloy provides good machinability, weldability, and reliable sealing performance, making it suitable for electronic packaging, vacuum devices, and aerospace components.

Key Features

• Fe-Ni controlled expansion alloy

• Stable and low thermal expansion coefficient

• Excellent glass/ceramic sealing performance

• Good processability and welding properties

• Available in rods, wires, and customized forms

Typical Applications

• Glass-to-metal and ceramic-to-metal seals

• Electronic packaging housings

• Semiconductor device supports

• Vacuum devices and relays

• Aerospace instruments and precision devices