Our 4J43 Fe-Ni-Co Alloy Wire is a high-performance material built for advanced glass-to-metal sealing in aerospace technology. With 42% nickel, 15% cobalt, and 43% iron, it delivers a CTE of ~5.2 ppm/°C (20-500°C), perfectly matching specific glasses for airtight seals. It’s tough, corrosion-resistant, and designed to handle the extreme conditions of aerospace environments. Whether you’re working on satellite components or avionics, our 4J43 wire ensures your seals stay strong and reliable.
For more details, pls directly contact us.
The aerospace industry is soaring, with global demand for advanced materials growing at a CAGR of 5.8% through 2032. Satellites, space exploration, and next-gen avionics are pushing the need for lightweight, thermally stable alloys that can withstand extreme conditions. Glass-to-metal seals are critical for sensors, connectors, and vacuum systems in these applications, where even slight thermal expansion can cause failures. Our 4J43 wire meets these demands head-on, offering precision and durability that align with the industry’s focus on innovation and reliability.
| Elements | 4J29 | 4J36 | |
| Carbon (C) | Not greater than | 0.03 | 0.05 |
| Sulfur (S) | 0.02 | 0.02 | |
| Phosphorus (P) | 0.02 | 0.02 | |
| Manganese (Mn) | ≤0.50 | 0.20-0.60 | |
| Silicon (Si) | ≤0.30 | ≤0.30 | |
| Nickel (Ni) | 28.5-29.5 | 35.0-37.0 | |
| Chromium (Cr) | - | - | |
| Cobalt (Co) | 16.8-17.8 | - | |
| Iron (Fe) | Rest | Rest | |
| Other Elements |
| Alloy Grade | 20°C-100°C | 20°C-300°C | 20°C-500°C |
| 4J36 Invar Alloy | 1.2×10⁻⁶ /°C | 2.5×10⁻⁶ /°C | - |
| 4J29 Kovar Alloy | 4.6×10⁻⁶ /°C | 5.5×10⁻⁶ /°C | 6.2×10⁻⁶ /°C |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Density (g/cm³) | 8.1 | 8.2 |
| Tensile Strength (MPa) | 500-600 | 600-700 |
| Yield Strength (MPa) | 250-350 | 300-400 |
| Hardness (HV) | 150-200 | 200-250 |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Electrical Resistivity (10⁻⁶ Ω·cm) | 80 | 50 |
| Thermal Conductivity (W/m·K) | 10-12 | 16-18 |
For more details, pls directly contact us.
Our 4J43 Fe-Ni-Co Alloy Wire is a powerhouse in aerospace technology. It’s used in sensors for navigation and environmental monitoring, where hermetic seals protect sensitive electronics. Satellite components, like communication modules, rely on 4J43 for stable, long-lasting seals. In avionics, it’s found in vacuum tubes and high-reliability connectors that operate in extreme temperatures. Beyond aerospace, it’s a fit for telecommunications and defense, where its thermal stability and corrosion resistance shine in microwave components and radar systems.
Parameter | 4J43 Fe-Ni-Co | 4J33 Ni-Co | Kovar |
|---|---|---|---|
Composition | 42% Ni, 15% Co, 43% Fe | 35% Ni, 17% Co, 48% Fe | 29% Ni, 17% Co, 54% Fe |
CTE (ppm/°C, 20-500°C) | ~5.2 | ~4.7 | ~5.0 |
Temperature Range | -50°C to 500°C | -40°C to 450°C | -50°C to 400°C |
Curie Temperature | ~420°C | ~430°C | ~435°C |
Yield Strength (MPa) | ~360 | ~340 | ~345 |
Tensile Strength (MPa) | ~560 | ~520 | ~520 |
Density (g/cm³) | 8.25 | 8.27 | 8.36 |
Applications | Aerospace sensors, satellite parts | Semiconductor packaging, vacuum tubes | Glass-to-metal seals, electronics |
Oxidation Resistance | Excellent | Excellent | Excellent |
We know the market offers plenty of sealing alloys, but our 4J43 Fe-Ni-Co Alloy Wire stands out for its precision and performance. Our strict quality controls ensure a consistent CTE and robust mechanical properties (yield strength ~360 MPa, tensile strength ~560 MPa). We offer customized wire diameters and tempers, tailored to your project, with faster lead times than many alternatives. Our efficient production process keeps costs down while delivering top-quality wire, and our alloy’s excellent CTE matching outperforms others in high-stakes aerospace applications. With years of expertise, we’re the partner you need for cutting-edge alloy solutions.
Why Choose Our 4J43 Fe-Ni-Co Alloy Wire?
Our 4J43 Fe-Ni-Co Alloy Wire is engineered for the future of aerospace technology. Its precise thermal expansion, durability, and corrosion resistance make it the go-to choice for glass-to-metal sealing in satellites, sensors, and avionics. Whether you’re building for space or high-altitude flights, our wire ensures your components perform flawlessly. Contact us today to see how 4J43 can take your aerospace projects to new heights!
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.
For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
Client Visits
Building Stronger Partnerships
We support all kinds of testing:
FAQs
What is 4J43 Fe-Ni-Co Alloy Wire?
It’s a nickel-iron-cobalt alloy wire engineered for advanced glass-to-metal sealing, offering precise thermal expansion matching for aerospace applications.What are the key properties of 4J43?
It has a CTE of ~5.2 ppm/°C (20-500°C), excellent corrosion resistance, and high mechanical strength, ideal for hermetic seals in harsh environments.What industries use 4J43 Alloy Wire?
Aerospace, defense, electronics, and telecommunications use it for reliable glass-to-metal sealing in high-performance components.What are common applications for 4J43?
It’s used in aerospace sensors, satellite components, vacuum tubes, and high-reliability electronic connectors.How does 4J43 compare to other sealing alloys?
Its Ni-Co-Fe composition provides a tighter CTE match with specific glasses, ensuring superior seal durability compared to standard alloys.What temperature range is 4J43 effective in?
It performs reliably from -50°C to 500°C, maintaining seal integrity in extreme aerospace conditions.Is 4J43 weldable or machinable?
Yes, it’s weldable and machinable with standard techniques, though precise tooling is recommended to manage its toughness.How does 4J43 align with industry trends?
It supports the aerospace industry’s push for lightweight, durable materials in satellites, avionics, and space exploration technologies.
