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Kovar Blanks

Kovar Blanks
Interested in Kovar Blanks?

Eagle Alloys Corporation (EAC) is a leading global supplier of nickel iron controlled expansion alloys including ASTM F 15 Alloy (Kovar®) blanks. A wide variety of Kovar® blanks 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

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

Kovar® blanks are an alloy made up of 29% nickel, 17% cobalt, .2% silicon, .3% manganese and 53.5% iron. Kovar® blanks are known for its low coefficient of thermal expansion. Kovar®  blanks are 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 light bulbs.

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.

Eagle Alloys Kovar Blanks Capabilities

Min Size
Max Size
Size Range
Kovar® Blanks
Contact Us For Sizing
0.005" and up
*Custom sizes upon request

Kovar Blanks Stock Sizes Same Day Shipping (subject to prior sale)

Same Day Shipping
Kovar Blanks
  • Contact Us For Sizing
  • Contact Us For Sizing
  • Contact Us For Sizing

Common Industry Applications

STATEMENT OF LIABILITY - DISCLAIMER Any suggestion of product applications or results is given without representation or warranty, either expressed or implied. Without exception or limitation, there are no warranties of merchantability or of fitness for particular purpose or application. The user must fully evaluate every process and application in all aspects, including suitability, compliance with applicable law and non-infringement of the rights of others Eagle Alloys Corporation and its affiliates shall have no liability in respect thereof.


Contact Eagle Alloys

Toll Free: 800.237.9012
Local: 423.586.8738
Fax: 423.586.7456


Company Headquarters:
178 West Park Court
Talbott, TN 37877

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