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 Since the founding of the Durakool name over 70 years ago, our HermaSeal division has supported our Relay and Switch product line with in-house design and manufacturing of hermetic glass-to-metal seals, feed-throughs and metal-to-metal vacuum brazing. Requirements for unique and intricate seal components, which must withstand extreme challenges, are our speciality. Advanced, characteristics like:
● Ceramic-to-Glass bonding
● Metal-to-Metal brazing
● Glass-to-Metal sealing
Can all be done simultaneously using our proprietary processing. Our in-house capabilities continue to supply various niche applications with this core expertise; HermaSeal is here to support your needs.
HermaSeal is capable of manufacturing transistor packages, quartz crystal packages, housings for photodiodes, hybrid packages, diode housings, battery and power feed-throughs, sensor packages, microwave packages, and many other custom designs.
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TYPES OF SEAL AVAILABLE
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STANDARD PRODUCT RANGES INCLUDE
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● Compression
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● TO-Series headers
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● Matched
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● Diode packages
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● Single pin
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● Feed-throughs
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● Multiple pins
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● Flange mounted packages
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● Sight Seals Etc.
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CUSTOM DESIGN
If you require an application specific hermetic seal or combination Glass/Ceramic/Metal assembly, HermaSeal would be pleased to provide engineering support with your design.
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APPLICATIONS INCLUDE
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TECHNOLOGY ADVANTAGE
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● Opto-electronics
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● Excellent electrical insulation
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● Telecommunications
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● High hermeticity
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● Automotive Electronics
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● Pressure resistance
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● Pressure Sensors
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● Corrosion resistance
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● Battery Terminals
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● High operating temperature
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● Mechanical strength
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● Solderability
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● Easy final assembly (i.e. welding or wire bonding)
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● High reliability
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TECHNOLOGY COMPARISON
COMPRESSION SEALS: The coefficient of thermal expansion of the header/seal body greatly exceeds that of both the glass and the electrode(s). The external metal component shrinks to form a compression ring around the glass. Assemblies of the available combinations are shown in the table below.
Typical compression seals will withstand extreme temperatures, in some cases -454º F (-270º C) to 842º F (450º C) with no loss in integrity.
MATCHED SEALS: The coefficient of thermal expansion of the metal components and the glass are similar. The hermetic seal is typically made by forming a bond between the glass and the oxide created on the metal components prior to sealing. Assemblies are available in the following combinations of materials:
Matched seals are more susceptible to temperature excursions, and are not recommended for applications exceeding 85º F (-65º C) to 482º F (250º C).
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Material
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Compression Seal
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Matched Seal
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Header / Body
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● Cold Rolled Steel, Inconel, Stainless Steel
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● Kovar, Tungsten, Molybdenum
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Electrodes
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● 52 Alloy, Copper Cored 52 Alloy, 42 Alloy, 42-6 Alloy
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● Kovar, Tungsten, Molybdenum
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Glass
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● Alkali Barium, Lead Silicate, Potash Lead, Soda Lime
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● Borosilicate (Alkali, Barium, Soda, Potash)
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Typical Characteristics offered by our seal assemblies
● Insulation resistance ranges from 1010 to 1012 Ohms.
● Breakdown voltage 40 VAC/55 VDC per radial .001 of glass between header and electrode
● Hermeticity 1.0 x 10-9 1.0 x 10-10Atm cc/sec (mbar l/s) He.
SURFACE FINISH
HermaSeal offer a variety of high quality surface finishes to meet the application requirements. These include but are not limited to:
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