Product Description

4J50 wire is a precision iron-nickel soft magnetic alloy containing approximately 50% nickel and is equivalent to ASTM F15 standard. It is designed for applications requiring a close thermal expansion match with borosilicate glass and ceramic materials, making it ideal for glass-to-metal sealing.

This alloy wire offers excellent soft magnetic properties, good mechanical stability, and consistent thermal performance. It is widely used in electronic tubes, relays, vacuum devices, sensors, and microelectronic packaging. 4J50 wire is often referred to as a Kovar-type sealing material and is compatible with a wide range of high-reliability electronic and aerospace applications.

Key Features

• Matched thermal expansion to borosilicate hard glass

• Stable magnetic and mechanical performance

• Excellent glass-sealing and vacuum compatibility

• Smooth surface and high dimensional precision

• Good formability, weldability, and corrosion resistance

• Low outgassing for vacuum or hermetically sealed applications

Typical Applications

• Glass-to-metal sealed headers and pins

• Vacuum tubes, electronic relays, and sensors

• IC package leads and transistor enclosures

• Aerospace instrumentation and feedthroughs

• Medical electronics and hermetically sealed devices

• Thermal expansion matched sealing for glass/ceramic components

Chemical Composition (%)

Mechanical Properties (Annealed Condition)

Available Specifications

Packaging & Shipping

• Vacuum packaging or plastic spools

• Anti-corrosion treatment

• Air/sea/express delivery available

• Delivery time: 7–15 business days

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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.