kovar
Designation: ......................................................................................ASTMF-15
Composition: ................................................29%Nickel, 17%Cobalt,Balance Iron
Coeffecient of Thermal Expansion: .....................................50 x 10-7 / ºC
Seal Type Recommended Elan Glass Equivalent Glasses
   
Corning GE Kimble  
Matched 14 or 21
7052 706 EN-1  
  19
- - IN-3  
td> 35 (Elan #14 + 5 to 25% A14)
- - -  
  88
- - -  
   
       
Compression 28
7070 - KG-33  

Material Summary:
Kovar is a nickel-cobalt-ferrous alloy originally developed by Carpenter Technology.  With its low expansion and ease of use, Kovar is the most popular alloy for match seal applications.  Elan 88 was specifically developed to be the perfect match for Kovar in applications such as power tubes, microwave tubes, and transistors.