Invar® / Controlled Expansion Alloys

A specialized family of Nickel-Iron alloys engineered to have an exceptionally low or controlled coefficient of thermal expansion (CTE). Essential for precision applications where dimensional stability is critical.

Available Invar Grades

Invar 36

A 36% nickel-iron alloy with the lowest coefficient of thermal expansion of any commercially available metal (approx. 1/10th that of carbon steel) from cryogenic temperatures up to 400°F.

Lowest CTE Aerospace Tooling Cryogenic Piping

View Invar 36 Details

인바 42

A 42% nickel-iron alloy designed with a constant rate of thermal expansion that matches silicon chips, glass, and alumina ceramics. Critical for electronic packaging and hermetic sealing.

Matches Silicon Electronic Frames Glass Sealing

View Invar 42 Details

Why Controlled Expansion Matters?

Most metals expand significantly when heated. In precision instruments, this expansion causes misalignment. In electronics, the mismatch between a metal chip frame and the silicon chip causes cracking.

Invar Alloys solve this. Invar 36 essentially does not expand at all near room temperature. 인바 42 expands at a specific, controlled rate to move exactly in sync with electronic components.

Grade Comparison: Thermal Expansion

합금 등급	Nickel Content	Expansion Characteristic	Primary Application
Invar 36	36%	Near Zero expansion up to 400°F (200°C).	Composite molds, laser positioning, LNG piping.
인바 42	42%	Controlled expansion to match Silicon/Ceramic.	Lead frames, hermetic glass-to-metal seals.

주요 산업

📡

Electronics

Integrated circuit lead frames and semiconductor packaging.

✈️

Aerospace Composites

Lay-up molds for carbon fiber parts (Invar 36 matches carbon fiber CTE).

❄️

Cryogenics & LNG

Piping for Liquefied Natural Gas (-162°C) requiring stability.

Need Precision Alloy Material?

We stock Invar 36 and 42 in plate, sheet, and round bar. Cut-to-size services available for tooling plate.

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