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High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging

Huona (Shanghai) New Material Co., Ltd.
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    Buy cheap High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging from wholesalers
     
    Buy cheap High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging from wholesalers
    • Buy cheap High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging from wholesalers

    High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging

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    Brand Name : HUONA
    Model Number : WIRE
    Certification : ISO9001 SGS
    Price : negotiable
    Payment Terms : T/T
    Supply Ability : 100,000 pieces / week
    Delivery Time : a week
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    High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging

    High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging

    Product Overview

    4J33 alloy wire is a precision low-expansion Fe-Ni-Co alloy material specifically designed for hermetic glass-to-metal sealing applications. With approximately 33% nickel and a small amount of cobalt, this alloy offers a thermal expansion coefficient closely matched to hard glass and ceramics. It is widely used in the manufacture of vacuum tubes, infrared sensors, electronic relays, and other high-reliability devices.


    Material Composition

    • Nickel (Ni): ~33%

    • Cobalt (Co): ~3–5%

    • Iron (Fe): Balance

    • Others: Mn, Si, C (trace amounts)

    Thermal Expansion (30–300°C): ~5.3 × 10⁻⁶ /°C
    Density: ~8.2 g/cm³
    Electrical Resistivity: ~0.48 μΩ·m
    Tensile Strength: ≥ 450 MPa
    Magnetic Properties: Soft magnetic, good permeability and stability


    Available Specifications

    • Diameter: 0.02 mm to 3.0 mm

    • Surface: Bright, oxide-free

    • Delivery form: Coils, spools, or cut length

    • Condition: Annealed or cold-drawn

    • Custom sizes and packaging available


    Key Features

    • Excellent match with hard glass for vacuum-tight sealing

    • Stable thermal expansion for precision components

    • Good corrosion resistance and weldability

    • Clean surface finish, vacuum-compatible

    • Reliable performance in aerospace and electronic applications


    Typical Applications

    • Glass-to-metal hermetic seals

    • Vacuum tubes and infrared sensors

    • Relay housings and electronic packaging

    • Optical device enclosures

    • Aerospace-grade connectors and leads


    Packaging & Shipping

    • Standard plastic spool, vacuum-sealed or custom packaging

    • Delivery via air, sea, or express

    • Lead time: 7–15 working days depending on order size



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