Our experience and expertise in hermetic welding plus brazing allows us to offer range of glass-to-metal seals for the healthcare, military, aerospace, electronic, and automotive applications.

Using resistance welding, we are able to hermetically join glass-to-metal seals to metal surfaces, such as battery lids. To ensure the high hermeticity of the packages, we take into consideration factors such as the type of materials, component design, and welding parameters to ensure the welding process will not damage the glass-to-metal seal

Beyond our in-house welding and testing capabilities, HST can also produce brazed leak-tight assemblies. By hermetic brazing, various components and materials can be joined together. Regardless of the processing approach we adopt, be it welding or brazing, all our hermetically sealed components are subject to 100% leak tests. We guarantee a hermeticity of better than 1 x 10-8 cc/sec of helium on all our welded or brazed packages. We test both the weld (or braze) and the glass-to-metal seal to make sure the package is leak free.

When hermeticity has to be guaranteed, Hermetic Seal Technology is the solution.


Types of Lithium Battery SystemsLithium / 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)
ApplicationsOil 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 MaterialsMild Steel Stainless Steel Titanium
Pin Materials52 Alloy Copper Core 446 or 52 alloy Molybdenum Platinum-Iridium Stainless Steel Other Materials Available Upon Request
Glass MaterialsBabal 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
CapabilitiesBrazing Glass Formulation Glass Sealing Resistance Welding
TestingHermeticity Testing (100 % leak tests are performed on all seals) Hypot (High Voltage) Testing / Breakdown Voltage Insulation Resistance Testing (Isolation)
Outsourced ServicesElectrochemical Corrosion Testing Glass Smelting Humidity Testing Laser Welding Machining Plating Salt Spray Testing Stamping
Hermeticity1 x 10^8 cc/sec helium leak rate
Production CapabilityWe 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 AdvantagesHST 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 ServedAerospace Automotive Electronic Healthcare Medical Military Oil Exploration
Companies Using HST SealsHalliburton
Quality ControlISO Compliant