Kovar, an iron-nickel-cobalt alloy, is another alloy that exhibits the “Invar effect.” Compared to other alloys, Kovar expands at a variable rate with increasing temperature with very little change in dimension. Kovar is often found in applications requiring a hermetic seal between the metal and glass or ceramic component. Additionally, primary applications include for x-ray and microwave tubs, and light bulb ends to name a few. 

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

Interested in learning more? Check out our Kovar Spotlight!

**These numbers are based on actual test data and represent the alloy’s range of possible mechanical properties. This data is not meant to replace design guides and specifications and should not be used by themselves for design purposes. Please consult with Signicast’s engineering team for further assistance.  

Mechanical Properties

Material Alloy Tensile Strength   Yield Strength (0.2%)   Hardness   Hardness  
PSI x 103
PSI x 103
Rockwell B (HRC)
Rockwell C (HRC)


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Last updated 12.10.2023