Neil Metals stands out as a reliable manufacturer and supplier of precision-engineered Kovar Bars and Rods, proudly based in Kolkata, India. We’ve built a reputation for quality and dependability, offering Kovar products specifically designed to meet the demanding needs of the electronics, aerospace, and defense sectors. Kovar, a unique nickel-iron-cobalt alloy, is particularly prized for its controlled thermal expansion, making it perfect for applications that require metal-to-glass or ceramic seals. At Neil Metals, we guarantee that every Kovar Bar and Rod adheres to international standards for dimensional accuracy, mechanical stability, and metallurgical integrity—ensuring high-performance assemblies in critical environments, backed by our commitment to reliable supply and customer-focused service.
Kovar Bars and Rods are made up of about 29% nickel, 17% cobalt, and the rest iron, along with trace amounts of manganese and silicon. This distinctive blend gives Kovar a thermal expansion coefficient that closely aligns with borosilicate glass and ceramic materials. It boasts impressive dimensional stability over a wide temperature range, along with strong mechanical properties, excellent weldability, and low gas permeability. Kovar typically offers a tensile strength of around 75–100 ksi and good ductility, making it an excellent choice for precision sealing applications and environments that demand thermal and mechanical reliability.
| Standards : | UNS K94610 | Werkstoff Nr 1.3981 | DIN 17745 | ASTM F15 | AMS 7726 | AFNOR NF A54-301 | S.E.W 385 |
| Size Range : | 0.015″ Thk up to 2″ Thk |
| Thickness : | Range from .008″ to .0125″ |
| Length : | 2m, 2.44m, 3m, or as required |
| Width : | 10-2500mm |
| Weight % | Ni | Fe | Co | C | Mn | Si | Al | Cr | Mg | Zr | Ti | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy K Kovar | 29.0 | 53.0 | 17.0 | 0.04 max | 0.50 max | 0.20 | 0.10 max | 0.20 max | 0.10 max | 0.10 max | 0.10 max | 0.20 max | 0.20 max |
| Material | Condition | Yield Strength (0.1% Offset) | Tensile Strength | Elongation % | ||
|---|---|---|---|---|---|---|
| psi | MPa | psi | MPa | |||
| Alloy K Kovar | Annealed | 49,000 | 340 | 75,000 | 520 | 42 |
| ASTM | UNS | Workstoff | AMS | DIN | AFNOR | S.E.W |
| F15 | K94610 | 1.3981 | 7726 | 17745 | NF A54-301 | 385 |
Kovar Bars and Rods find extensive use in applications that require a precise thermal expansion match between metals and glass or ceramics. They play a crucial role in the electronics industry for creating hermetic seals in vacuum tubes, transistors, and semiconductor packages. In the aerospace and defense fields, Kovar is utilized for feedthroughs, sensor housings, and structural components that face temperature fluctuations. It’s also used in scientific instruments and medical devices, especially where leak-proof glass-to-metal seals are essential. Thanks to its reliability and consistent performance, Kovar is a go-to choice in these critical applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Neil Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Kolkata, India
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