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 |
| Density | 8.2 g/cm³ |
| Thermal Expansion Coefficient (30–300°C) | ~5.0 × 10⁻⁶ /°C |
| Melting Point | Approx. 1450°C |
| Electrical Resistivity | ~0.45 μΩ·m |
| Magnetic Permeability (μ) | High at low magnetic field intensities |
| Tensile Strength | ≥ 450 MPa |
| Brand Name | HUONA |
| Model Number | WIRE |
| Certification | ISO9001 |
| 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 |
| Density | 8.2 g/cm³ | Thermal Expansion Coefficient (30–300°C) | ~5.0 × 10⁻⁶ /°C |
| Melting Point | Approx. 1450°C | Electrical Resistivity | ~0.45 μΩ·m |
| Magnetic Permeability (μ) | High at low magnetic field intensities | Tensile Strength | ≥ 450 MPa |
| Brand Name | HUONA | Model Number | WIRE |
| Certification | ISO9001 | Place of Origin | CHINA |
| High Light | Soft Magnetic Low Expansion Alloy ，customizable Low Expansion Alloy ，Soft Magnetic invar welding wire | ||
Product Name:
Glass-Sealing Alloy Wire 4J28 | Fe-Ni Alloy Wire | Soft Magnetic Material
Material:
4J28 (Fe-Ni Alloy, Kovar-type Glass-Sealing Alloy)
Specifications:
Available in various diameters (0.02 mm to 3.0 mm), lengths customizable
Applications:
Glass-to-metal sealing, electronic tubes, sensors, vacuum components, and other precision electronic devices
Surface Treatment:
Bright surface, oxide-free, annealed or cold-drawn
Packaging:
Coil/Spool form, plastic wrapping, vacuum-sealed bag or customized packaging upon request
Product Description:
4J28 alloy wire, also known as Fe-Ni alloy wire, is a precision soft magnetic and glass-sealing material. With a composition primarily consisting of iron and approximately 28% nickel, it provides exceptional thermal expansion matching with borosilicate glass, making it widely used in electronic packaging and glass-to-metal sealing applications.
4J28 wire exhibits excellent sealing properties, stable magnetic performance, and reliable mechanical characteristics. It is extensively used in electronic tubes, hermetic packaging, semiconductor housings, and high-reliability aerospace and military components.
Features:
Excellent Glass-to-Metal Sealing: Ideal thermal expansion compatibility with borosilicate glass for tight, hermetic seals
Good Magnetic Properties: Suitable for soft magnetic applications and stable magnetic response
High Dimensional Precision: Available in ultra-fine diameters, precision-drawn for sensitive electronic components
Oxidation Resistance: Bright surface, oxidation-free, suitable for vacuum and high-reliability sealing
Customizable: Dimensions, packaging, and surface conditions can be tailored to specific customer needs
Applications:
Electronic tubes and vacuum devices
Glass-to-metal sealed relays and sensors
Semiconductor and hermetic packages
Aerospace and military-grade electronic components
Optical and microwave components requiring precise thermal expansion matching
Technical Parameters:
Chemical Composition:
Ni: 28.0 ± 1.0%
Co: ≤ 0.3%
Mn: ≤ 0.3%
Si: ≤ 0.3%
C: ≤ 0.03%
S, P: ≤ 0.02% each
Fe: Balance
Density: ~8.2 g/cm³
Thermal Expansion Coefficient (30–300°C): ~5.0 × 10⁻⁶ /°C
Melting Point: Approx. 1450°C
Electrical Resistivity: ~0.45 μΩ·m
Magnetic Permeability (μ): High at low magnetic field intensities
Tensile Strength: ≥ 450 MPa
Elongation: ≥ 25%
Packaging & Shipping:
Packaging:
Plastic spools, vacuum bags, anti-rust wrapping, and customized labels upon request
Shipping Methods:
Air freight, sea freight, express delivery
Lead Time:
7–15 working days based on order quantity
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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