High Precision 4J32 Alloy Wire Low Expansion Fe-Ni Wire For Vacuum And Sensor Applications

Product Overview

4J32 alloy wire is a precision nickel-iron alloy with a low and controlled coefficient of thermal expansion, specifically designed for glass-to-metal sealing applications. With approximately 32% nickel, this alloy provides excellent compatibility with hard glass and borosilicate glass, ensuring reliable hermetic sealing in electronic vacuum devices, sensors, and military-grade packages.

Material Composition

• Nickel (Ni): ~32%

• Iron (Fe): Balance

• Minor elements: Manganese, Silicon, Carbon, etc.

Thermal Expansion (30–300°C): ~5.5 × 10⁻⁶ /°C
Density: ~8.2 g/cm³
Tensile Strength: ≥ 450 MPa
Resistivity: ~0.45 μΩ·m
Magnetic Properties: Soft magnetic behavior with stable performance

Available Sizes & Supply

• Diameter: 0.02 mm – 3.0 mm

• Length: in coils, spools, or cut-to-length as required

• Condition: Annealed or cold drawn

• Surface: Bright, oxide-free, smooth finish

• Packaging: Vacuum-sealed bags, anti-rust foil, plastic spools

Key Features

• Excellent match with glass for hermetic sealing

• Stable low thermal expansion performance

• High purity and clean surface for vacuum compatibility

• Easy to weld, shape, and seal under various processes

• Customizable size and packaging options for different applications

Applications

• Glass-to-metal sealed relays and vacuum tubes

• Sealed electronic packages for aerospace and defense

• Sensor components and IR detector housings

• Semiconductor and optoelectronic packaging

• Medical devices and high-reliability modules

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High Precision 4J32 Alloy Wire Low Expansion Fe-Ni Wire For Vacuum And Sensor Applications Images