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4J29 Kovar Alloy Bar for Glass to Metal Sealing with Controlled Thermal Expansion in Precision Electronic Applications
| Place of Origin | CHINA |
|---|---|
| Brand Name | HUONA |
| Certification | ISO9001 |
| Model Number | ROD |
| Minimum Order Quantity | 1 |
| Price | NEGOTATION |
| Packaging Details | Standard export packing in cartons or wooden crates; custom packaging available upon request |
| Delivery Time | 10–25 days depending on specifications and quantity |
| Payment Terms | T/T |
| Supply Ability | 5,000 – 10,000 pcs per month (adjustable based on order |
Product Details
| 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 | ||
| Highlight | Glass to Metal Sealing Kovar Alloy Bar,Controlled Thermal Expansion Kovar Alloy Rod,Precision Electronic Applications Iron Nickel Cobalt Alloy Bar |
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Product Description
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.
Key Features
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
Typical Chemical Composition
| 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 |
Technical Specifications
| 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 |
Applications
Glass to metal sealing components
Electronic vacuum devices
Transistor and semiconductor packaging
Aerospace precision components
Relay and sensor housings
Instrumentation and control systems
Advantages
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 and Delivery
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
Inquiry Guidance
Please advise required diameter length surface condition and application environment. We will recommend the most suitable 4J29 Kovar alloy bar specification for your project.
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