Product Description

4J33 alloy rod is a Fe-Ni-Co controlled expansion alloy containing about 33% nickel and cobalt. It is specially developed for applications requiring stable thermal expansion to match materials such as ceramics or glass.

This alloy combines good mechanical properties, excellent machinability, and stable expansion behavior, making it widely used in electronic packaging, vacuum devices, and precision instruments.

Key Features

• Fe-Ni-Co controlled expansion alloy

• Stable thermal expansion coefficient

• Excellent hermetic sealing performance with glass/ceramic

• Good processability and weldability

• Available in rods, wires, sheets, and customized forms

Typical Applications

• Electronic packaging and sealing

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

• Precision electronic components

• Vacuum tubes and relay parts

• Aerospace and instrumentation industry