Hermetic Seal Technology (HST) has been setting the standards for custom glass-to-metal seals, especially lithium battery seals, since 1994. We have specially formulated Lithium corrosion resistant glass to greatly reduce corrosion and to isolate lithium electrolytes, such as lithium / manganese dioxide (LiMnO2), lithium / sulfur dioxide (Li/SO2), and lithium / thionyl chloride (Li/SOCl2) in lithium batteries, from foreign agents. HST lithium battery seals can withstand corrosive chemicals, electrical variations, as well as extreme temperatures to give your battery a long shelf life.

For high performance lithium batteries, we fabricate reliable hermetic seals from high-conductivity pin materials, exotic alloys and both standard and custom formulated lithium battery glasses. We specialize in consistently processing lithium compatible glass materials including Cabal 12, TA-23, and Babal. Sealing hermetic glass to stainless steels or pure metals such as titanium and molybdenum, is our specialty.

Our extensive sealing and welding capabilities enable us to seal into an eyelet, seal directly into the battery lid, or even hermetically weld the eyelet into the lid. We specially design eyelets that can be either resistance-welded or laser welded into the battery lid. With in-house hermeticity testing capabilities, HST performs 100% leak checks on all parts to guarantee that the seal is hermetic to better than 1 x 10-8 cc/sec helium.


Types of Lithium Battery Systems Lithium / Manganese Dioxide (LiMnO2)
Lithium / Silver chromate (Li-Ag2CrO4)
Lithium / Silver oxide+vanadium pentoxide (Li-Ag2V4O11 )
Lithium / Sulfur Dioxide (Li/SO2)
Lithium / Sulfuryl Chloride (Li-SO2Cl2)
Lithium / Thionyl Chloride (Li/SOCl2)
Applications Oil Exploration and Down Hole monitoring
Lithium Systems in Communication Systems, Torpedoes, and Missiles
Medical Lithium Battery Applications for Implantable Defibrillators, Pacemakers, Neurostimulators, and Drug Infusion Systems
Lithium Batteries in Consumption Meters, Memory Back-up, Portable Diagnostic Equipment, and Emergency Locator Transmitters
Body Materials Mild Steel
Stainless Steel
Pin Materials 52 Alloy
Copper Core 446 or 52 alloy
Stainless Steel
Other Materials Available Upon Request
Glass Materials Babal
Cabal 12 and other low silica glass
Corning 9010
Corning 9013
HST Custom Lithium Corrosion Resistant Glass
Other Borosilicate, Barium Alkali, and Soda-Lime glass
Capabilities Brazing
Glass Formulation
Glass Sealing
Resistance Welding
Testing Hermeticity Testing (100 % leak tests are performed on all seals)
Hypot (High Voltage) Testing / Breakdown Voltage
Insulation Resistance Testing (Isolation)
Outsourced Services Electrochemical Corrosion Testing
Glass Smelting
Humidity Testing
Laser Welding
Salt Spray Testing
Hermeticity1 x 10^8 cc/sec helium leak rate
Production Capability We have the ability to handle orders from ten parts to millions of parts
We can also do sample parts
HST can help you with free hermetic seal design and development to insurance you have a reliable and robust glass to metal seal
Glass-to-Metal Seal Advantages HST hermetic seals are hermetic (leak - tight) to isolate lithium batteries from external moisture and foreign contaminants to ensure long battery life
HST glass seals can resist extreme temperature and pressure variations while maintaining hermeticity
Our specially formulated glass materials have high corrosion resistance to lithium electrolytes eliminating glass corrosion which reduces shelf life
Our "Clean-Seal" technology ensures the high quality of glass-to-metal parts that are free from oxidation and chemical residue that can effect welding and material corrosion resistance
Industries Served Aerospace
Oil Exploration
Companies Using HST Seals Halliburton
Quality ControlISO Compliant