Glass-To-Metal Seals and Feedthroughs

 

Glass-To-Metal Seals and Feedthroughs

InSealing specializes in Glass-To-Metal Seals and Feedthroughs, where glass is heated to a molten state and then wetted to the metal, creating a tight bond while carefully controlling the thermal expansion of both materials to prevent breakage.

InSealing offers Glass-To-Metal Seals and Feedthroughs.

• Glass is heated to a molten state then wetted to the metal, forming a tight bond.
• The thermal expansion of the glass and the metal are carefully measured and controlled to prevent breakage.
• InSealing offers not only electrical feedthroughs, the most common type we make, but also RF and microwave feedthroughs.

Materials:

• Body materials: Cold rolled steels, Stainless steel, Inconel, etc.
• Glass Materials: Soda lime, Lead silicate, etc.
• Electrodes Material: Alloy 52, Copper Cored 52 Alloy, Alloy 42, etc.
• Typically Compression Seals withstand temperatures ranging from -250°C to 400°C. Allowable operating temperatures would be from -60°C to 200°C under thermal cycling and shock.

Properties:

• Hermeticity: up to 1 x 10-9 atm cc/sec He
• Insulation resistance: typically exceeds 1 GΩ @ 100 VDC
• Mechanical strength can withstand 20,000 psi with proper design for use in high-pressure applications
• Dielectric: can withstand voltage depending on joint geometry and glass material selected. Below are some typical glass values

– Barium Alkali: 6.3
– Brososilicate: 4.9
– Soda Lime: 7.2

Plating:

• Gold Plating
• Silver Plating
• Electrolytic and Electroless Ni Plating
• Tin Plating