Product Description

4J42 alloy rod is a Fe-Ni controlled expansion alloy containing about 42% nickel. It features a linear thermal expansion coefficient closely matching that of hard glass and ceramics, making it ideal for glass-to-metal and ceramic-to-metal sealing applications.

This alloy offers stable expansion performance, good processing properties, and excellent sealing reliability, widely used in electronic packaging, vacuum devices, and aerospace components.

Key Features

• Fe-Ni controlled expansion alloy

• Stable thermal expansion coefficient

• Excellent sealing performance with glass/ceramic

• Good machinability and weldability

• Supplied in rods, wires, strips, and customized forms

Typical Applications

• Glass-to-metal and ceramic-to-metal seals

• Electronic packaging housings

• Vacuum tubes, relays, and electronic devices

• Semiconductor device supports

• Aerospace and precision instruments

Chemical Composition (%)

Physical and Performance Properties

Available Specifications

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.