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.

Unit of Measure



  • All types of Lithium batteries
  • Industrial
  • Military
  • Automotive
  • Aerospace
  • Sensors, Consumption Meters, Cameras, and Computers
  • Shell Materials

    N/A Stainless Steel Titanium Other Materials Available on Request

    Pin Materials

    N/A 52 Alloy (Ni/Fe 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 Leak Checking Resistance Welding

    Plating Options

    N/A Copper Plating Electroless Ni Plating Electrolytic Ni Plating Hard Gold Plating Pure Gold Plating Silver Plating And Many Others

    Welding Considerations

  • The type of materials used in the welding process
  • Heat shock applied to the glass seal during the welding process
  • Hermetic Brazing Materials

    N/A Mild Steel Stainless Steel

    Types of Joints (Brazing)

    N/A Butt Joints Lap Joints Rod-in-tube Joint Tube-in-tube Joint

    Bond Strength (Brazing)

    N/A Dependant on specifications and configuation of part


    N/A Hypot (High Voltage) Testing / Breakdown Voltage Insulation Resistance Testing (Isolation) Less than 1 x 10-8 cc/sec helium leak rate (100% tested)


    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
  • Industries Served

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

    Quality Control

    N/A ISO Compliant