Huona (Shanghai) New Material Co., Ltd.
| Payment Terms | T/T |
| Supply Ability | 1000kg Per Week |
| Delivery Time | A WEEK |
| Packaging Details | Carton or Wooden Case |
| Thermal Expansion (30–300°C) | ~5.0 x 10⁻⁶ /°C |
| Density | ~8.2 g/cm³ |
| Resistivity | ~0.42 μΩ·m |
| Tensile Strength | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Diameter | 0.02 mm – 3.0 mm |
| Brand Name | HUONA |
| Model Number | wire |
| Certification | ISO9001 SGS |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T | Supply Ability | 1000kg Per Week |
| Delivery Time | A WEEK | Packaging Details | Carton or Wooden Case |
| Thermal Expansion (30–300°C) | ~5.0 x 10⁻⁶ /°C | Density | ~8.2 g/cm³ |
| Resistivity | ~0.42 μΩ·m | Tensile Strength | ≥ 450 MPa |
| Elongation | ≥ 25% | Diameter | 0.02 mm – 3.0 mm |
| Brand Name | HUONA | Model Number | wire |
| Certification | ISO9001 SGS | Place of Origin | China |
| High Light | High Precision glass sealing alloy wire ，High Precision Low Expansion Alloy ，SGS glass sealing alloy wire | ||
Product Overview:
4J29 alloy wire, also known as a Fe-Ni-Co sealing alloy or Kovar-type wire, is widely used in applications requiring glass-to-metal hermetic sealing. It contains approximately 29% nickel and 17% cobalt, which gives it a controlled thermal expansion closely matched with borosilicate glass. This makes it ideal for use in electronic tubes, vacuum relays, infrared sensors, and aerospace-grade components.
Material Composition:
Nickel (Ni): ~29%
Cobalt (Co): ~17%
Iron (Fe): Balance
Other elements: trace amounts of Mn, Si, C, etc.
Thermal Expansion (30–300°C): ~5.0 x 10⁻⁶ /°C
Density: ~8.2 g/cm³
Resistivity: ~0.42 μΩ·m
Tensile Strength: ≥ 450 MPa
Elongation: ≥ 25%
Available Sizes:
Diameter: 0.02 mm – 3.0 mm
Length: on spools, coils, or cut lengths as required
Surface: Bright, smooth, oxidation-free
Condition: Annealed or cold drawn
Key Features:
Excellent thermal expansion compatibility with hard glass
Ideal for hermetic sealing in electronic and aerospace applications
Good weldability and high dimensional accuracy
Stable magnetic properties under various environmental conditions
Custom diameters and packaging options available
Typical Applications:
Vacuum relays and glass-sealed relays
Infrared and microwave device packaging
Glass-to-metal feedthroughs and connectors
Electronic tubes and sensor leads
Hermetically sealed electronic components in aerospace and defense
Packaging & Shipping:
Supplied in plastic spools, coils, or vacuum-sealed bags
Anti-rust and anti-moisture packaging optional
Shipping available by air, sea, or express
Delivery time: 7–15 working days depending on quantity
Handling and Storage:
Keep in a dry, clean environment. Avoid moisture or chemical exposure. Re-annealing may be needed before sealing to ensure optimal bonding with glass.
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2008
Total Annual:
8000000-100000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
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, hig... 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, hig...
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