Kovar Suppliers of Custom Sizes

Eagle Alloys Corporation (EAC) is a leading global supplier of nickel iron controlled expansion alloys including ASTM F 15 Alloy (Kovar®). A wide variety of Kovar® sizes are available from stock with immediate shipping and custom sizes can be quickly produced.

Cold Finished Bars – .250″ to 1.00″ Diameter
Hot Forged Bar – 3/4″ and up
Forged Blocks – Up to 200 lbs. and 36″ Long Max
Hot Rolled Flats – 15″ Wide Max and 0.125″ Minimum Thickness
Coil/Foil – 0.004” Thk up to 0.082” Thk
Sheet/Plate – 0.015” Thk up to 2” Thk
Wire – 0.004”Dia

Please contact our courteous sales team to assist you. Please view or print our Kovar stock list for our complete stock sizes and capabilities.  Eagle Alloys Corporation is an ISO Certified Corporation and have been supply the highest quality ASTM F 15 Alloy for over 35 years.

Kovar® is typically supplied to meet the requirements of UNS-K-94610, ASTM-F-15, AMS/MIL-I-23011.  Other specifications upon request. Our ASTM F15 alloy (Kovar ®) is in conformance with Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and are DFARS Compliant.  Eagle Alloys Corporation is an ISO Certified Corporation and have been supply the highest quality Kovar® for over 35 years.

Kovar® is an alloy made up of 29% nickel, 17% cobalt, .2% silicon, .3% manganese and 53.5% iron. Kovar® is known for its low coefficient of thermal expansion. Kovar®  is suitable for uses which require a matched expansion seal between metal and glass parts.  Kovar® end uses are usually glass sealing in the electronics industry.  Typical applications for Kovar® are glass-to-metal seals, lead frames, electronic package base, lids, power tubes, transistors, diodes, microwave tubes, hybrid packages, x-ray tubes, vacuum tubes, and lightbulbs.

Eagle Alloys also supplies additional low expansion, controlled expansion, and glass-to-metal or ceramic sealing alloys including Invar®, Alloy 42, Alloy 46 Alloy, 47/50, 48, 49, and Alloy 52. EAC can supply soft magnetic Alloy 50, Hiperco 50 & 50A, and Vim Var Core Iron.

Kovar is a registered trademark of CRS Holdings, Inc., a subsidiary of Carpenter Technology Corp.