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Nestled in the industrial heart of Hamilton, New Zealand, Will Sheetsandplates has built a reputation as a trusted source for high-quality specialty metals. We are particularly proud to supply Kovar Foil, a material engineered for precision and reliability. Understanding the critical demands of advanced manufacturing, we ensure our Kovar Foil meets the exacting standards required for applications where failure is not an option. It’s this commitment to quality and consistency that makes us a go-to partner for engineers and innovators across the country and beyond.
This unique alloy is precisely formulated with a specific balance of iron, nickel, and cobalt. This carefully controlled composition gives Kovar Foil its most valuable characteristic: a thermal expansion rate that closely matches that of borosilicate glass and certain ceramics. This means that when the foil is sealed to these materials, it resists the stresses that would crack or weaken other metals, creating a strong, hermetic bond even through significant temperature swings, which is essential for long-term integrity.
| Standard Specification : | UNS K94610 | Werkstoff Nr 1.3981 | DIN 17745 | ASTM F15 | AMS 7726 | AFNOR NF A54-301 | S.E.W 385 |
| Dimensions : | ASTM, ASME, and API |
| Sheets Thickness : | Range from .008″ to .0125″ |
| Plates Thickness : | Ranges from .0125″ to 5.00″ |
| Sheets/Plates Width : | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Sheets/Plates Length : | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Tempers : | Annealed, 1/4, 1/2 Hard, 3/4 Hard, Full Hard |
| Hardness : | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Value Added Service : | Cladding, Heat Treatment, Annealed, Pickling, Polish, Rolling, Cutting, Bending, Forging, Minor Fabrication Etc. |
| Chemical Analysis | |
| Cr | 20 nom |
| Ni | 35 nom |
| Mo | 10 nom |
| Co | 35 nom |
| 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 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Kovar foil is a high-performance alloy made primarily of iron, nickel and cobalt, which offers exceptional benefits in specialized applications. Its low thermal expansion makes it ideal for glass coatings on metals in electronics, ensuring stability under temperature changes Coatings are also highly resistant to thermal cycling, providing durability in internal environments is strong. Its excellent mechanical properties and ease of manufacture make it suitable for precisely complex designs, while the ability to maintain excellent performance at high temperatures ensures reliable performance at aerospace, electronics and pharmaceutical industries.
The primary use of Kovar Foil is in creating those perfectly sealed environments necessary for protecting sensitive electronics. You’ll find it in the packages for transistors, integrated circuits, and laser diodes, where it forms a reliable barrier against moisture and contaminants. Beyond electronics, its matching expansion properties are vital in aerospace components, certain lighting systems, and even scientific instruments. Essentially, wherever a durable metal-to-glass or metal-to-ceramic seal is required for a device to function flawlessly, Kovar Foil is often the unsung hero making it possible.
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