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The coefficient of expansion
of the housing is greater than that of the glass
As it passes through a high temperature furnace under
a controlled atmosphere, the housing expands, the glass
melts and fills the cavities. When cooling, the glass
is pressurized by the housing. This is what happens
with seals on housings made of stainless steel, inconel
alloys and the like.
This type of seal is very resistant
to mechanical stresses and is furthermore economical
to produce. This seal is widely used in the connector
industry or for the manufacture of base units for sensors
(pressure, temperature etc.).
Materials for the housing :
- Stainless steel (AISI 303, 304L, 316L, 321…)
- Inconel © (X750 ©, 718 ©…)
- Mild steel (XC10F…)
Materials for the pins :
- FeNi (ASTM F30, Nilo ©, N48 ©, N52 ©)
- FeNiCo (ASTM F15, Kovar © , Nilo K ©,
Dilver P ©)
- FeCo ( Vacon ©)
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