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Your Position: Home - Minerals & Metallurgy - What is Invar 36 alloy?

What is Invar 36 alloy?

Invar 36 alloy is a unique material with exceptional properties that make it ideal for a wide range of applications. From precision instruments to aerospace components, this alloy offers high dimensional stability and low thermal expansion. In this article, we will explore what Invar 36 alloy is, its composition, properties, and its various applications.

What is Invar 36 alloy?

Invar 36 alloy is a nickel-iron alloy with a low coefficient of thermal expansion. It was developed by Swiss scientist Charles Édouard Guillaume in the early 20th century. The name "Invar" is derived from the word "invariable," which hints at the material's ability to maintain its dimensions over a wide range of temperatures.

What is Invar 36 alloy?

Composition and Properties.

Invar 36 alloy is composed of 36% nickel and 64% iron. The addition of nickel gives the alloy its unique properties, such as low thermal expansion and high dimensional stability. The alloy also exhibits strong resistance to corrosion, making it suitable for use in harsh environments.

Low Thermal Expansion.

One of the most notable properties of Invar 36 alloy is its extremely low coefficient of thermal expansion. This means that it expands or contracts very little when exposed to temperature variations, making it an excellent choice for applications that require precise dimensions and high dimensional stability. This property makes Invar 36 alloy particularly useful in the manufacturing of precision instruments like optical and laser systems, where small dimensional changes could affect performance.


Invar 36 alloy has a wide range of applications in various industries due to its unique properties. Some of the key applications include:

1. Aerospace Industry: Invar 36 alloy is used in the aerospace industry for manufacturing components that require high dimensional stability and low thermal expansion. It finds applications in satellites, aerospace instruments, and other critical systems.

2. Electronics Industry: The electronics industry relies on Invar 36 alloy for the production of electronic components, including transistors, diodes, and integrated circuits. The low thermal expansion of the alloy ensures proper functioning and reliability of these delicate devices.

3. Scientific Instruments: Invar 36 alloy is extensively used in scientific instruments, such as telescopes and interferometers, where precise measurements are crucial. The alloy's stability enables accurate readings by minimizing the impact of temperature changes.

4. Industrial Applications: Invar 36 alloy is also employed in various industrial applications, including the production of molds, fixtures, and tools. Its high dimensional stability and resistance to corrosion make it well-suited for such uses.


Invar 36 alloy is a remarkable material that offers exceptional dimensional stability and low thermal expansion. Its unique properties make it invaluable in industries that require precision and reliability. From aerospace to electronics and scientific instruments, Invar 36 alloy finds applications in a wide range of sectors. If you are looking for a material that can meet your high-performance requirements, consider Invar 36 alloy.

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