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Hermetic Seals (Glass to Metal Seals)


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.

TYPES OF SEAL AVAILABLE

STANDARD PRODUCT RANGES INCLUDE

● Compression

● TO-Series headers

● Matched

● Diode packages

● Single pin

● Feed-throughs

● Multiple pins

● Flange mounted packages

● Sight Seals Etc.




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.

APPLICATIONS INCLUDE

TECHNOLOGY ADVANTAGE

● Opto-electronics

● Excellent electrical insulation

● Telecommunications

● High hermeticity

● Automotive Electronics

● Pressure resistance

● Pressure Sensors

● Corrosion resistance

● Battery Terminals

● High operating temperature

● Mechanical strength

● Solderability

● Easy final assembly (i.e. welding or wire bonding)

● High reliability




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).


Material

Compression Seal

Matched Seal

Header / Body

● Cold Rolled Steel, Inconel, Stainless Steel

● Kovar, Tungsten, Molybdenum

Electrodes

● 52 Alloy, Copper Cored 52 Alloy, 42 Alloy, 42-6 Alloy

● Kovar, Tungsten, Molybdenum

Glass

● Alkali Barium, Lead Silicate, Potash Lead, Soda Lime

● Borosilicate (Alkali, Barium, Soda, Potash)







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:

Material

Advantages

Electroless Ni

Good corrosion protection
Good wire bonding
Good solderability with flux
Uniform thickness
Good weldability

Electrolytic Ni

Good corrosion protection
Good solderability
Excellent pre-plate for Au

Pure Au flash

Improved solderability
Protects against tarnish/oxidation

Pure Au

Good wire bonding
Excellent solderability without aggressive flux

Hard Au

Wear resistant protection for contacts, plugs, connectors

Ag – Silver

Excellent solderability
High electrical conductivity

Sn – Tin

Improved corrosion protection
Very good solderability

Cu – Copper

Good conductivity
Excellent pre-plate for Ag

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