Product Detail
Kovar(ASTM F15)
Brand: A-one Alloy
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Kovar* (ASTM F-15)


Kovar is a Ni-Fe alloy with 29%  Nickel, 17% Cobalt and the remaining balance is Iron. The expansion  characteristics of Kovar match both borosilicate (or Pyrex) glasses and  alumina ceramics, making it one of the most popular of the controlled  expansion alloys for hermetic sealing applications.


Kovar alloy is magnetic at all  temperatures below the Curie point. Magnetic properties will depend upon heat  treatment; the lower the hardness, the higher the permeability values and  lower hysteresis loss.

Density: 8.36g/cm3

Curie Temp: 435°C(815°F)


Kovar is widely used in applications  such as power tubes, microwave tubes, transistors, diodes, hybrid packages,  and other kinds of scientific instruments.

Equal grades

4J29(China grade), ASTM F-15, NILO K, Pernifer 2918,  Rodar, Dilvar P1, UNS K94610, 29-17 alloy

Chemical  composition

C≤0.020, Ni≤29.0,  Si≤0.20, Mn≤0.30, Co≤17.0, Fe=remainder



Forms available  at A-one Alloy

Plate, sheet, strip, wire, rod, bar,  forging, tube, pipe, capillary, square pipe, and parts


Huge stock of strip, bar and wire in  stock. Fast delivery with 5 days for customized size. Delivery of other  products please confirm with A-one Alloy.

*Kovar is a registered trademark ofCarpenter Technology Corporation