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.
Unit of Measure


Types of Lithium Battery Systems

N/A 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)


  • 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

    N/A Mild Steel Stainless Steel Titanium

    Pin Materials

    N/A 52 Alloy Copper Core 446 or 52 alloy Molybdenum Platinum-Iridium Stainless Steel Other Materials Available Upon Request

    Glass Materials

    N/A Babal Cabal 12 and other low silica glass Corning 9010 Corning 9013 HST Custom Lithium Corrosion Resistant Glass TA-23 Other Borosilicate, Barium Alkali, and Soda-Lime glass


    N/A Brazing Glass Formulation Glass Sealing Resistance Welding


    N/A Hermeticity Testing (100 % leak tests are performed on all seals) Hypot (High Voltage) Testing / Breakdown Voltage Insulation Resistance Testing (Isolation)

    Outsourced Services

    N/A Electrochemical Corrosion Testing Glass Smelting Humidity Testing Laser Welding Machining Plating Salt Spray Testing Stamping


    N/A 1 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

    N/A Aerospace Automotive Electronic Healthcare Medical Military Oil Exploration Sensor

    Companies Using HST Seals

    N/A Halliburton Schlumberger

    Quality Control

    N/A ISO Compliant