KOV (Kovar) - UNS K94610 | Low Thermal Expansion Alloys

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About KOV (Kovar) - UNS K94610 | Low Thermal Expansion Alloys

Item	Details
Grade	KOV (Kovar)
Reference Standards (for reference only)	UNS K94610 DIN 1715 AMS 7728
Available Shapes	Coil, Sheet
Manufacturable Thickness Range (Strip, Sheet)	Please contact us
Manufacturable Width Range (Strip, Sheet)	Please contact us
Length	Strip or Sheet (Length less than 2,000 mm)
Technique	Cold Rolled
Temper	Annealed, Skin passed, As Rolled (Hard)
Coil I.D.	300, 400, 567 mm
Chemical Composition	29Ni–17Co–Fe
Density	8.25–8.60 g/cm³
Thermal Expansion	5.1–6.2 × 10^-6/K (20–500°C)
Thermal Conductivity	16.7–17.3 W/(m·K)
Young's Modulus	138–207 GPa
Minimum Order Quantity	Please contact us
Country of Origin	Japan
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP, etc.
Packing	Our Standard Packing for Export
Export Markets	Asia, Middle East, North America, South America, Europe, etc.
Description	KOV (Kovar) is a nickel–cobalt–iron alloy composed of approximately 29% nickel and 17% cobalt. It is a controlled low thermal expansion alloy designed to match the thermal expansion behavior of hard glass materials. Because of this compatibility, it is widely used in glass-to-metal sealing applications, particularly in IC lead frames and hermetic packaging where reliable sealing performance is required. Although its thermal expansion is higher than Alloy 36 or Alloy 42, it provides a close match to hard glass, ensuring stable bonding and long-term dimensional reliability in electronic and vacuum devices.