Kovar Wire
Ken-tron draws Kovar wire, a nickel-iron-cobalt alloy specially formulated for controlled expansion. It is widely used in glass-to-metal and glass-to-ceramic sealing, semiconductor leads, and precision electronic components.
Chemical Composition
(ASTM F-15 / SAE AMS I23011 Class 1)
| Iron | ~ 53 % nominal |
| Nickel | ~ 29 % nominal |
| Cobalt | 1~ 17 % nominal |
| Manganese | max 0.50 % |
| Silicon | max 0.20 % |
| Carbon | max 0.04 % |
| Aluminium, Magnesium, Zirconium, Titanium, Copper, Chromium, Molybdenum | each ≤ 0.20 % depending on element |
Other Key Properties
| Temperature coefficient of expansion | ~ 4.6-5.2 µm/m·°C from 30-400 °C; ~5.1-5.5 at 30-450 °C |
| Density) | ~ 8.35 g/cm³ (≈ 0.302 lb/in³) |
| Melting Point | ~ 1 450-1 460 °C (≈ 2 640 °F) |
Click here for a full color parts brochure (1.31 MB) in PDF format.
Ken-tron specialises in small-diameter, close-tolerance Kovar wire manufactured to customer specification. For quotes or detailed datasheets, please get in touch.
