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Glass Sealing Alloy Foil (Light Tight) (Fe54/Ni29/Co17)

Formula: Fe 54/Ni 29/Co 17
Form: Foil (Light Tight)
Material: Glass Sealing Alloy
Commodity: Alloys
Light Tight: Light Tight
Hazard Pictogram: GHS07, GHS08
Glass Sealing Alloy Foil (Light Tight) (Fe54/Ni29/Co17) is part of our range of specialty alloys for glass-to-metal seals. With 68 variations available, it provides an airtight, hermetic seal between glass and metal while blocking light transmission. This alloy is designed to match the thermal expansion properties of glass with compositions like iron-nickel-cobalt and nickel-chrome-molybdenum. Applications include vacuum tubes, cathode ray tubes, and other devices requiring robust glass-to-metal interfaces that maintain high electrical resistivity and limit light permeation.
Technical Data Sheet Safety Data Sheet Tolerance Properties

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Material Properties for Alloys

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

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