Glass to metal sealing

Since the creation of the department dedicated to hermetic products, Conesys Europe has mastered the difference glass-to-metal sealing processes in order to meet a maximum of demands for hermetic products.

Conesys Europe hermetic connectors are obtained from a set of technological bricks covering all industrial glass-to-metal sealing processes.

Introduction to glass-to-metal sealing processes


Glass-to-metal sealing processes are all based on a technical solution consisting in melting the glass with metal parts to be assembled under controlled conditions.
These processes make it possible to obtain a perfectly sealed barrier between two environments while ensuring the transfer of electrical signals between these two environments.

The benefits of glass-to-metal sealing

There are multiple advantages to glass-to-metal sealing and provide high performance connectors:

  • Use in a vacuum
  • High resistance to corrosive environments
  • Robust sealing barrier
  • Resistance to high temperatures (up to 350°C)
  • High resistance to shocks and vibrations
  • Stability and resistance to thermal shocks
  • Small size and made-to-measure

Mastery of glass-to-metal sealing

The quality of the implemented processes is based on the mastery of technological bricks specific to glass-to-metal sealing.

The quality controls applied to glass-to-metal sealing guarantee, in particular, dimensional, electrical performance, and hermetic compliance.

Which glass-to-metal sealing for which use

Currently 4 types of glass-to-metal sealing are available. The type of glass-to-metal sealing is chosen depending on the intended use of the hermetic electrical connector.


compression sealing

Compression glass-to-metal sealing is primarily used for signal processing and power supply in corrosive environments with very high temperatures and pressure.

The main materials used are stainless steel (304L, 316L, 316Ti, 321, etc.) and low carbon steel.


Match sealing

Matched glass-to-metal sealing is primarily used for signal processing and requires complex design and extremely demanding industrial control.

The main materials used are FeNiCo controlled expansion alloys (iron, nickel, cobalt).


Low temperature sealing

Low temperature, glass-to-metal sealing is primarily used for signal processing and power supply with strong weight reduction constraints, while ensuring strong resistance to corrosive environments and galvanic pair phenomena.

The main materials used are aluminum alloys and copper alloys.


Special sealing

Special sealings are characterized by a glass-to-metal sealing primarily used for signal processing in extreme temperatures, high pressure, and corrosive sulfur environments.

The main materials used are titanium and nickel alloys.