The housing and the pins are made from a special alloy (iron-nickel-cobalt), which has a low coefficient of expansion, but equal to that of the glass.

When they first pass through the furnace under a controlled oxidising atmosphere, the metal pieces are oxidised. The pieces are then assembled and passed through again at a higher temperature under a controlled atmosphere where the metal oxides on the surface will react with the glass to form a perfect bond.

This type of seal is traditionally used to produce housings for micro-electronic and optronic applications.

Materials used :

• FeNi (ASTM F30, Nilo ©, N48 ©, N52 ©)
  
  
• FeNiCo (ASTM F15, Kovar ©, Nilo K ©, Dilver P © )