KMCO Technology: Connector, Fiber Optics, Cutting, Grinding, Press, Plating, Welding/Brazing, Cable Assy, Glass Hermetic Seal

Glass Sealing

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What is Glass Sealing?

Glass sealing is typically used to hermetically seal insulator and metal together. Kovar and Kovar alloy (Fe:Ni:Co = 54:29:17) are used to jointly seal metal pin such as signal wire and glass by heating them together. Glass sealing is a method to utilize the properties of metal and glass that have similar thermal expansion, whereas disadvantage is its weakness against external force such as shock and shrinkage.

Samples of Sealed Products

RF Package
Terminal for Millimeter Wave
High Pressure Vessel

Combination of Metal Sealing

Base Lead Type of Glass Finishing
Matched Seals Kovar Kovar Borosilicate Glass Ni-Ep+Au-Ep
Copper/Tungsten Kovar Borosilicate Glass Ni-Ep+Au-Ep
Compression Seals Steel Fe-Ni50% Soft Glass Ni-Ep+Au-Ep
Steel Copper-Clad Soft Glass Ni-Elp
Stainless Material Fe-Ni50% Soft Glass Ni-Ep

Handling Items

1. Multi-conductor header
2. Millimeter-wave band (DC-110GHz) terminal
3. Heat sink header assy
4. Hermetic sealing for high pressure vessel
5. Customized products

Process Flowchart (Integrated Production System)

1. Purchase raw materials →
2. Machining process →
3. Sealing →
(4. Silver soldering)
(Press, M/C, Turning process)→
5. Surface treatment →
6. Quality check →
7. Delivery

Facilities for Sealing

– Tunnel Kiln: 7
– Helium leak tester: 2
– Super insulation resistance test

Quality Assurance

In order to ensure high quality standard of hermetically sealed products, various inspections and QA program are conducted. These processes include inspections as below and comply with MIL-STD-883,  MIL-PRF-38534, JEDEC No. 9 and Telcordia Standard.

Inspections include:
– Air tightness         
– Helium leak (with mass analyzer)
– Electrical insulating properties
– Electric property (high potential and dielectric resistance)
– Abrasion of lead line
– Visual and dimensional check
– Solder wettability
– Thermal shock

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