4J45 Sealing Alloy Wire | Fe-Ni Wire for Sensors Relays Semiconductor Components

Product Overview

4J45 alloy wire is a controlled thermal expansion Fe-Ni alloy consisting of approximately 45% nickel. It is engineered for applications requiring dimensional stability and hermetic sealing, particularly where thermal compatibility with glass or ceramic is crucial. This material is ideal for use in semiconductor lead frames, sensor housings, and high-reliability electronic packaging.

Material Composition

• Nickel (Ni): ~45%

• Iron (Fe): Balance

• Trace elements: Mn, Si, C

CTE (Coefficient of Thermal Expansion, 20–300°C): ~7.5 × 10⁻⁶ /°C
Density: ~8.2 g/cm³
Electrical Resistivity: ~0.55 μΩ·m
Tensile Strength: ≥ 450 MPa
Magnetic Properties: Weakly magnetic

Specifications

• Diameter range: 0.02 mm – 3.0 mm

• Surface finish: Bright / oxide-free

• Supply form: Spools, coils, cut lengths

• Delivery condition: Annealed or cold-drawn

• Custom dimensions available

Key Features

• Moderate thermal expansion matching glass/ceramic

• Excellent sealing and bonding characteristics

• Good weldability and corrosion resistance

• Dimensional stability under thermal cycling

• Suitable for microelectronics and optical devices

Applications

• Hermetic seals for semiconductors

• Infrared sensor housings

• Relay casings and electronic modules

• Glass-to-metal seals in communication components

• Aerospace-grade packages and connectors

Packaging & Shipping

• Vacuum-sealed or plastic spool packaging

• Custom labeling and bulk options available

• Delivery: 7–15 working days

• Shipping methods: Air freight, sea freight, courier

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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.