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

Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.

Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, high-purity magnesium, magnesium plate, magnesium die casting, magnesium extrusion profiles and other metal magnesium and deep processing products.

Thermal spray wire Division offers a wide variety of pure metal and metal alloy wires, including nickel-, iron-, aluminum-, and zinc-based wires for thermal spray projects.

Fuctional Material Division supply electronic packaging COMPONENTS(GTMS, CTMS), soft magnetic alloys and bimetal strip.

Our company is certified by ISO9001 quality system and ISO14001 environmental protection system.

Mission Statement

We try our best to understand and utilize information within the environment. With this competency, we assist customers to create added value and contribute to the development of industry and healthy living.

We strive for "Best, " welcome challenges, and are relentless till we deliver products and solutions.