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The sheet and tape of the brand name 29KN are made of an alloy, which is also called a kovar. In the classical version, the alloy consists of 29% nickel, 17% cobalt and an iron base. Such a successful combination of the basic chemical ingredients of the composition provides unique performance characteristics. First, such material differs from other alloys of this class by a rather high coefficient of specific electrical resistance and almost zero index of linear temperature expansion in a wide temperature range (from twenty to four hundred degrees) against a background of excellent thermal conductivity (about 19 W / m◦C). These characteristics fully explain the good performance parameters of the material and the absence of significant plastic deformation of parts made from it, even with a significant increase in the temperature index of the working area. However, before using such a raw material, it is worth taking into account its significant disadvantage in the form of low corrosion resistance in a humid environment. To increase the stability of semi-finished products from such an alloy to wet corrosion, they are covered with a protective layer.

Percent composition according to GOST 10994−74
Alloy FROM Mn Fe P S Ni Co Cr Al Cu Ti Si
29 NK ≤0.03 ≤0,4 51.14−54.5 ≤0.015 ≤0.015 28.5−29.5 17−18 ≤0.1 ≤0.2 ≤0.2 ≤0.1 ≤0.3


A sheet and a tape of the mark 29ННК are used in the production of capacitors, however, to increase the resistance of the material to moisture, the alloy is preliminarily coated with a thin silver protective layer. Also, the sheet and the 29NC tape are in great demand in radio electronics and in the electrovacuum industry. The presence of expensive nickel and cobalt in the material increases the cost of the material, but high working and technological characteristics, as well as reliable long-term operation completely compensate for the initial costs.


Our wide range of products from the 29Kn alloy is available on our website Ltd. The high quality of the products and the absence of intermediaries determine the most favorable conditions for purchasing materials for solving any problems of modern industry. Delivery in a short time to almost any region of the country and compliance of all products with regulatory documents has long Won the love and trust of regular customers.