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Glass Sealing Alloy Foil (Fe54/Ni29/Co17)

Available Configurations

Properties common to all products in this list

Commodity: Alloys Material: Nickel/Iron/Cobalt - Glass Sealing Alloy (Kovar®) Form: Foil/Film/Sheet Composition: Fe 54/Ni 29/Co 17 Temper: Annealed Coating: Uncoated Surface Finish: Standard
Glass Sealing Alloy Foil (Fe54/Ni29/Co17) is a precision-rolled metal designed for high-fidelity sealing with technical and borosilicate glasses. This foil form offers superior thinness and surface conformity, enabling minimal interface resistance and enhanced hermetic sealing performance. The Fe-Ni-Co alloy's carefully balanced thermal expansion coefficient ensures compatibility with glass during thermal cycling, reducing stress and preventing fracture propagation. It is extensively employed in hermetically sealed photonic packages, X-ray and microwave vacuum tubes, and optoelectronic sensor systems. The foil format particularly benefits edge bonding in glass-to-metal transitions and acts as a metallization interface in high-precision windows and fiber-optic feedthroughs. Its application in microfabricated devices and cryogenic vacuum assemblies underscores its critical role in miniaturized and high-performance systems. As cutting-edge technologies demand thinner, lighter, and more robust seals, Glass Sealing Alloy Foil (Fe54/Ni29/Co17) stands at the forefront of metallurgical integration in advanced materials engineering.
Starting at $230.00 each
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Material Properties

Mechanical Properties
Element Value
Elongation at break( % ) 30
Modulus of elasticity( GPa ) 207
Tensile strength( MPa ) 510-520
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 48.9
Temperature coefficient( K⁻¹ ) 0.0037
Magnetic Properties
Element Value
Curie temperature( C ) 435
Thermal Properties
Element Value
Melting point( C ) 1450
Specific heat( J K⁻¹ kg⁻¹ ) 439@23°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 17.3@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 4.81@20-200°C
Physical Properties
Element Value
Density( gcm⁻³ ) 8.36-8.5
each

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Available Configurations

Properties common to all products in this list

Commodity: Alloys Material: Nickel/Iron/Cobalt - Glass Sealing Alloy (Kovar®) Form: Foil Composition: Fe 54/Ni 29/Co 17 Temper: Annealed Coating: Uncoated Surface Finish: Standard

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Tolerances

Foil
Thickness <0.01mm ±25%
Thickness 0.01mm - 0.05mm ±25%
Thickness >0.05mm ±10%