Product Description

4J36 alloy rod, also known as Invar 36, is a low expansion Fe-Ni alloy containing about 36% nickel. It is widely recognized for its extremely low coefficient of thermal expansion (CTE) around room temperature.

This property makes 4J36 ideal for applications requiring dimensional stability under temperature fluctuations, such as precision instruments, measuring devices, aerospace, and cryogenic engineering.

Key Features

• Fe-Ni controlled expansion alloy (Ni ~36%)

• Very low thermal expansion coefficient

• Excellent dimensional stability

• Good machinability and weldability

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

Typical Applications

• Precision measuring instruments

• Optical and laser system components

• Aerospace and satellite structures

• Electronic packaging requiring dimensional stability

• Cryogenic engineering devices

• Standards of length, balance springs, precision pendulums