Huona (Shanghai) New Material Co., Ltd.
| Payment Terms | T/T |
| Supply Ability | 5,000 – 10,000 pcs per month (adjustable based on order |
| Delivery Time | 10–25 days depending on specifications and quantity |
| Packaging Details | Standard export packing in cartons or wooden crates; custom packaging available upon request |
| Product | 4J29 Kovar Alloy Bar |
| Alloy Type | Fe Ni Co Glass Sealing Alloy |
| Shape | Round Bar Rod |
| Diameter | 3 mm to 100 mm Customizable |
| Length | 500 mm 1000 mm 2000 mm Customiza |
| Density | 8.2 g per cm3 |
| Thermal Expansion Coefficient | 4.6 to 5.2 x10 minus6 per C |
| Melting Range | 1450 to 1490 C |
| Packaging | Wooden case carton export packing |
| Brand Name | HUONA |
| Model Number | ROD |
| Certification | ISO9001 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | T/T | Supply Ability | 5,000 – 10,000 pcs per month (adjustable based on order |
| Delivery Time | 10–25 days depending on specifications and quantity | Packaging Details | Standard export packing in cartons or wooden crates; custom packaging available upon request |
| Product | 4J29 Kovar Alloy Bar | Alloy Type | Fe Ni Co Glass Sealing Alloy |
| Shape | Round Bar Rod | Diameter | 3 mm to 100 mm Customizable |
| Length | 500 mm 1000 mm 2000 mm Customiza | Density | 8.2 g per cm3 |
| Thermal Expansion Coefficient | 4.6 to 5.2 x10 minus6 per C | Melting Range | 1450 to 1490 C |
| Packaging | Wooden case carton export packing | Brand Name | HUONA |
| Model Number | ROD | Certification | ISO9001 |
| Place of Origin | CHINA | ||
| High Light | 4J29 Kovar Glass Metal Sealing Alloy Bar ，Controlled Thermal Expansion Electronic Rod ，Precision Electronic Kovar Bar Material | ||
4J29 Kovar alloy bar is a precision iron nickel cobalt alloy containing controlled thermal expansion characteristics.
It is widely used for glass to metal sealing applications due to its thermal expansion coefficient closely matching borosilicate glass and ceramics.
The alloy provides stable dimensional performance under temperature changes and is commonly used in electronic vacuum devices and precision sealing structures.
Controlled low thermal expansion alloy
Excellent glass to metal sealing performance
Stable mechanical properties under temperature variation
Good machinability and dimensional stability
Suitable for precision electronic and vacuum applications
| Element | Content |
|---|---|
| Fe | Balance |
| Ni | 28 to 30 percent |
| Co | 16 to 17 percent |
| Mn | less than 0.5 percent |
| Si | less than 0.3 percent |
| C | less than 0.03 percent |
| Item | Specification |
|---|---|
| Product | 4J29 Kovar Alloy Bar |
| Alloy Type | Fe Ni Co Glass Sealing Alloy |
| Shape | Round Bar Rod |
| Diameter | 3 mm to 100 mm Customizable |
| Length | 500 mm 1000 mm 2000 mm Customizable |
| Density | 8.2 g per cm3 |
| Thermal Expansion Coefficient | 4.6 to 5.2 x10 minus6 per C |
| Melting Range | 1450 to 1490 C |
| Surface Finish | Bright Black or Polished |
| Packaging | Wooden case carton export packing |
| MOQ | Negotiable |
Glass to metal sealing components
Electronic vacuum devices
Transistor and semiconductor packaging
Aerospace precision components
Relay and sensor housings
Instrumentation and control systems
Excellent thermal expansion matching with glass
High sealing reliability and stability
Good machinability and formability
Stable performance under thermal cycling
Suitable for precision electronic applications
Supply Capacity
5000 to 8000 kg per month depending on specification
Lead Time
10 to 20 days depending on quantity
Packaging
Standard export wooden case or carton
Custom packaging available upon request
Please advise required diameter length surface condition and application environment. We will recommend the most suitable 4J29 Kovar alloy bar specification for your project.
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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