Kovar controlled expansion glass ceramic sealing seals alloy rod round bar sheet plate strip

Kovar® a Controlled Expansion, Nickel-Iron Alloy

Kovar Alloy, also known as ASTM F15, NILO® K, Pernifer® 2918, Rodar® and Dilver® P1 is a controlled expansion alloy. It is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (Pyrex) glass and alumina ceramics, making it one of the most popular of the controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You’ll find Kovar utilized in power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.

Ed Fagan Inc. stocks Kovar Alloy sheet, plate, rod, coil & strip, and photo-etch; and can cut, slit or centerless grind these to your specifications. If you require another form of Kovar Alloy, please call 800-348-6268 and one of our material experts can help you with your request.