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High Precision 4J33 Sealing Wire Controlled Expansion Alloy For Hermetic Packaging
| Place of Origin | CHINA |
|---|---|
| Brand Name | HUONA |
| Certification | ISO9001 SGS |
| Model Number | WIRE |
| Minimum Order Quantity | 1KG |
| Price | negotiable |
| Packaging Details | negotiable |
| Delivery Time | a week |
| Payment Terms | T/T |
| Supply Ability | 100,000 pieces / week |
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xProduct Details
| 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 | Surface | Bright, Oxide-free |
| Highlight | High Precision nickel alloy wire,High Precision glass sealing alloy,high Strength glass sealing alloy |
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Product Description
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
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Nickel (Ni): ~33%
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Cobalt (Co): ~3–5%
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Iron (Fe): Balance
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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
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Diameter: 0.02 mm to 3.0 mm
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Surface: Bright, oxide-free
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Delivery form: Coils, spools, or cut length
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Condition: Annealed or cold-drawn
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Custom sizes and packaging available
Key Features
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Excellent match with hard glass for vacuum-tight sealing
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Stable thermal expansion for precision components
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Good corrosion resistance and weldability
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Clean surface finish, vacuum-compatible
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Reliable performance in aerospace and electronic applications
Typical Applications
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Glass-to-metal hermetic seals
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Vacuum tubes and infrared sensors
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Relay housings and electronic packaging
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Optical device enclosures
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Aerospace-grade connectors and leads
Packaging & Shipping
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Standard plastic spool, vacuum-sealed or custom packaging
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Delivery via air, sea, or express
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Lead time: 7–15 working days depending on order size
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