High-Pressure Hermetic Seals for Extreme Environments

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What Are High-Pressure Hermetic Seals?

High-pressure hermetic seals are designed to maintain a completely air-tight and gas-tight barrier in systems exposed to extreme pressure differentials. Hermeticity is defined as the state of being air or gas tight, and in interconnect applications, it refers to sealing technology that prevents gases from passing through pressure boundaries via connectors or feedthroughs. A classic hermetic application is a receptacle feedthrough penetrating a pressurized bulkhead or sealed equipment housing.

Why Pressure Integrity Matters

In high-pressure systems, even microscopic leaks can result in pressure loss, corrosion, electrical failure, or safety risks. Hermetic seals prevent gas migration while preserving electrical insulation and mechanical stability. This makes them essential in environments where reliability and safety are non-negotiable.

Custom Hermetic Sealing Solutions

Complete Hermetics specializes in custom hermetic products, including hermetically sealed connectors, hermetic headers, hermetic packages, hermetic seals, and hermetic feedthroughs. Every seal is engineered to meet specific pressure, temperature, and environmental requirements. Advanced modeling and prototyping capabilities allow precise optimization before production.

From Prototypes to Production

Whether customers require small-scale manufacturing for prototypes or mass production for thousands of components, Complete Hermetics supports the full lifecycle. The company works closely with customers to ensure exact specifications are met, regardless of application complexity.

Serving Global Industries

Located in Santa Ana, California, Complete Hermetics serves customers worldwide in aerospace, defense, energy, medical, offshore drilling, and industrial systems. High-pressure hermetic seals are widely used in pressurized vessels, downhole drilling tools, aerospace systems, and military equipment.

Contact Complete Hermetics Today

Complete Hermetics guarantees customer satisfaction through close collaboration, engineering expertise, and rigorous quality standards. Each hermetic seal is designed to perform reliably under extreme pressure and environmental stress.

Precision Hermetic Technology and Custom Hermetic Solutions

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Custom Hermetic Manufacturing Expertise

Precision hermetic technology requires deep materials knowledge, process control, and engineering collaboration. Complete Hermetics is a custom manufacturer of glass-to-metal seals, ceramic-to-metal seals, hermetic feedthroughs, and hermetic seals, supporting demanding applications across multiple industries.

Comprehensive Hermetic Product Portfolio

Complete Hermetics designs and manufactures a complete range of hermetic solutions, including:

Industries That Depend on Hermetic Precision

These products are vital to defense systems, medical technology, semiconductor equipment, energy infrastructure, and aerospace platforms, where failure is not an option.

From Concept to Production Scalability

Precision hermetic technology must support both early-stage development and long-term manufacturing scalability. Complete Hermetics works closely with customers during the concept phase to evaluate materials, sealing methods, and performance requirements before transitioning designs into repeatable production processes. This approach minimizes redesign risk and ensures consistency across production runs. Whether supporting low-volume prototypes, qualification builds, or full-scale manufacturing, precision process control enables reliable hermetic performance while meeting cost, schedule, and quality objectives for complex engineering programs.

Engineering, Prototyping & Manufacturing

Founded in 2002 and located in Santa Ana, California, Complete Hermetics is a wholly owned subsidiary of Aegis Technology Inc. The company offers extensive engineering support, rapid prototyping, and scalable manufacturing capabilities for both low-volume and production-scale programs.

Why Choose Complete Hermetics

Complete Hermetics delivers precision hermetic technology, including hermetic seals, feedthroughs, connectors, vacuum viewports, and hermetically sealed packages engineered for extreme environments. In addition, the company provides battery end seals, hermetic headers, power packages, and custom hermetic assemblies tailored to customer specifications. With advanced manufacturing and hands-on engineering collaboration, Complete Hermetics supports critical systems worldwide.

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📧 Email: info@completehermetics.com
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Trust Complete Hermetics to deliver solutions that seal your success.

MIL-SPEC Hermetic Connectors

Hermetically Sealed Connectors for Aerospace and Medical Use

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What Are Hermetically Sealed Connectors?

Hermetically sealed connectors provide reliable electrical connections while preventing oxygen, moisture, bacteria, and contaminants from entering sealed systems. These connectors are designed for applications where conventional connectors fail due to corrosion, pressure changes, vibration, or temperature extremes.

A One-Stop Hermetic Connector Manufacturer

Complete Hermetics is a one-stop source for glass-sealed hermetic connectors and ceramic-sealed hermetic connectors, offering both electrically hermetic and vacuum-sealed connector solutions. Custom designs are available for virtually any mounting requirement, filling gaps left by conventional connector manufacturers.

MIL-Spec & Custom Connector Solutions

For military and aerospace applications, Complete Hermetics manufactures MIL-Spec hermetic connectors, including MIL-DTL-38999, MIL-C-5015, MIL-C-26482, and MIL-C-26500, as well as custom legacy replacements. Both circular and rectangular connectors are available with configurable contact counts, shell styles, and sealing technologies.

Lightweight Hermetic Connector Options

Weight matters. Titanium hermetic connectors provide exceptional strength-to-weight ratio and high-temperature resistance, while aluminum hermetic connectors offer ultra-lightweight solutions for low-temperature aerospace and military applications.

Environmental Protection and System Safety

Beyond electrical connectivity, hermetically sealed connectors play a vital role in protecting entire systems from environmental exposure. Moisture ingress, oxygen intrusion, and microbial contamination can quickly degrade sensitive electronics or compromise sterile environments in medical applications. Hermetic connectors create a sealed barrier that preserves internal conditions regardless of external pressure, humidity, or chemical exposure. This level of protection improves overall system safety, reduces maintenance requirements, and supports regulatory compliance in aerospace, medical, and defense industries where reliability and cleanliness standards are exceptionally strict.

Industries Served

Hermetically sealed connectors are used in submarines, offshore oil rigs, vacuum chambers, laboratory equipment, medical devices, and commercial and military aircraft, where reliability is critical.

Contact Complete Hermetics

Complete Hermetics manufactures hermetically sealed connectors, glass-to-metal seals, ceramic-to-metal seals, hermetic feedthroughs, hermetic headers, and vacuum-rated assemblies for extreme environments. The company also supports customers with custom connector designs, battery end seals, and power packages engineered to exact specifications. With flexible manufacturing and deep technical expertise, Complete Hermetics delivers hermetic connector solutions you can trust.

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Vacuum Feedthroughs for Hermetic Electrical Systems

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What Is a Vacuum Feedthrough?

Vacuum feedthroughs are essential components that allow electrical current or signals to pass into or out of a sealed or vacuum environment without compromising hermetic integrity. The terms Vacuum feedthrough, Electric Feedthrough, Glass Feedthrough, Glass-to-Metal Feedthrough, Ceramic Feedthrough, and Ceramic-to-Metal Feedthrough are often used interchangeably within the hermetic and vacuum industries. Regardless of terminology, the function remains the same: maintaining an airtight, gas-tight seal across a pressure boundary.

Why Hermeticity Matters

Hermeticity is defined as the condition of being completely air- or gas-tight. In interconnect applications, hermetic technology prevents gases, moisture, and contaminants from migrating through connectors or feedthroughs. Even microscopic leaks can disrupt system performance, contaminate sensitive processes, or cause long-term corrosion and electrical failure.

Glass-to-Metal vs. Ceramic-to-Metal Feedthroughs

Complete Hermetics designs and manufactures both glass-to-metal feedthroughs and custom ceramic-to-metal feedthroughs, allowing engineers to select the best solution based on temperature, voltage, pressure, and environmental demands. Glass-to-metal feedthroughs offer excellent electrical insulation and cost efficiency, while ceramic-to-metal feedthroughs provide superior performance in high-temperature, high-voltage, and harsh environments.

Electrical Performance and Long-Term Reliability

In addition to maintaining hermetic integrity, vacuum feedthroughs must provide stable electrical performance over long service lifetimes. Factors such as insulation resistance, dielectric strength, and contact stability are critical in high-vacuum and high-pressure environments. Poorly designed feedthroughs can lead to signal leakage, electrical noise, or insulation breakdown over time. By using proven glass-to-metal and ceramic-to-metal feedthrough technologies, systems benefit from consistent electrical isolation and reduced failure risk. This makes hermetic feedthroughs ideal for mission-critical systems where downtime, recalibration, or maintenance access is limited or impossible.

Custom Prototypes & Engineering Support

Every application is unique. Complete Hermetics specializes in custom prototypes for hermetic feedthroughs, working closely with customers to meet precise electrical, mechanical, and environmental specifications. Feedthroughs can be configured for laser-welded or solder-in installation, multi-pin layouts, and bulkhead mounting options.

Industries & Applications

Vacuum feedthrough are widely used in aerospace, defense, medical devices, semiconductor manufacturing, energy systems, and high-vacuum research equipment, where long-term reliability is non-negotiable.

Contact Complete Hermetics Today for Your Hermetic Capabilities

Complete Hermetics is a custom manufacturer of vacuum feedthroughs, glass-to-metal feedthroughs,  ceramic-to-metal feedthroughs, hermetic connectors, and hermetically sealed packages engineered for extreme environments. In addition to feedthrough solutions, the company provides battery end seals, hermetic headers, and power packages for mission-critical applications. From prototype to production, Complete Hermetics delivers precision hermetic solutions backed by deep engineering expertise.

Titanium headers

Battery End Seals for High-Reliability and Lithium Battery Applications

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Purpose of Battery End Seals

Battery end seals are critical hermetic components designed to protect internal battery elements from moisture, gas leakage, corrosion, and environmental exposure while allowing safe electrical connectivity. In high-energy battery systems—especially lithium battery seals—even minor leakage can result in performance degradation, safety hazards, or premature failure. Hermetic battery end seals ensure long-term containment and electrical stability in demanding operating environments.

Glass-to-Metal Sealing Technology for Batteries

Complete Hermetics utilizes advanced custom glass-to-metal sealing technologies that have proven highly reliable for battery end seal manufacturing. In this process, glass is heated to a controlled molten state and bonded to metallic housings and terminals, forming a robust, airtight, and electrically insulating seal. This technology is especially well suited for lithium battery end covers and capacitor lids, where consistent hermeticity and electrical isolation are mandatory.

Performance in Harsh Environments

Battery end seals manufactured by Complete Hermetics are engineered to withstand extreme environmental conditions, including wide temperature ranges from –40°C to over +150°C, electro-chemical corrosion, humidity exposure, pressure variation, and high electrical currents. These characteristics make them suitable for both portable and stationary energy systems operating in unpredictable or harsh conditions. The glass-to-metal interface provides excellent resistance to thermal cycling and long-term chemical exposure, ensuring stable performance throughout the battery’s lifecycle.

Testing, Inspection, and Reliability Assurance

To guarantee performance and safety, Complete Hermetics conducts 100% leak testing on battery end seals using helium mass spectrometry. The minimum guaranteed leak rate is ≤ 1 × 10⁻⁸ cc He/sec, ensuring exceptional hermetic integrity. When required, additional testing such as high electrical isolation resistance and dielectric breakdown voltage testing can be performed to meet customer or regulatory requirements. This rigorous inspection process supports use in mission-critical applications.

Material Specifications and Customization

Battery end seals are available in a wide range of material combinations to match application-specific requirements.
Body materials include stainless steel, mild steel, titanium, and aluminum, offering strength, corrosion resistance, and weight optimization.
Pin materials include Alloy 52, molybdenum, stainless steel, and titanium, selected for electrical performance and thermal compatibility.
Glass materials include Corning 9010, Corning 9013, TA23, Cabal 12, and custom glass formulations upon request.

Applications Across Industries

Hermetic battery end feedthrough seals are widely used in medical and healthcare equipment, communication systems, weapon systems, sensor and monitoring devices, automotive electronics, and energy storage systems where safety and reliability are paramount.

 

Contact Complete Hermetics Today for Your Reliable Hermetic Products

Complete Hermetics is a custom manufacturer of battery end seals, lithium battery glass-to-metal sealed lids, capacitor end seals, and other precision hermetic components engineered for extreme environments. In addition to battery sealing solutions, the company also offers custom ceramic-to-metal seals and feedthroughs, along with glass-to-metal seals,  hermetic connectors, hermetic headers, and hermetically sealed packages for aerospace, defense, medical, energy, and industrial applications. From prototype development through full-scale production, Complete Hermetics delivers reliable hermetic technologies backed by rigorous testing and deep engineering expertise.

Vacuum Feedthroughs and Bulkhead Hermetic Solutions

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Why Vacuum Feedthroughs Are Critical

Vacuum feedthroughs are specialized hermetic components that allow electrical power or signals to pass through vacuum or pressure barriers without leakage. Even microscopic leaks can compromise vacuum integrity, contaminate sensitive processes, or disrupt system performance. As a result, vacuum feedthroughs are essential in applications requiring precise environmental control.

High-Vacuum and Bulkhead Designs

Hermetic bulkhead feedthroughs provide multiple electrical pathways through a single flange-mounted interface. This design reduces the number of enclosure penetrations, improving system reliability and simplifying installation. Bulkhead feedthroughs are commonly used in high-vacuum chambers, pressure vessels, and sealed instrumentation housings.

Material Compatibility and Precision Engineering

Vacuum feedthroughs are manufactured using materials such as stainless steel, Kovar, titanium, and high-purity ceramics to ensure compatibility with vacuum environments. These materials exhibit low outgassing, excellent thermal stability, and corrosion resistance. Precision manufacturing and sealing techniques are required to meet stringent leak-rate specifications, often verified through helium leak testing.

Performance in Sensitive Systems

In vacuum systems, performance margins are extremely narrow. Feedthroughs must maintain electrical insulation, mechanical stability, and hermetic integrity under thermal cycling, vibration, and pressure differentials. Poorly designed feedthroughs can lead to system downtime, safety risks, or costly repairs.

Critical Applications

Vacuum feedthroughs are widely used in semiconductor fabrication equipment, aerospace simulation chambers, research laboratories, medical imaging systems, and high-energy physics instrumentation.

Contact Complete Hermetics Today for Your Hermetic Solutions

Complete Hermetics designs and manufactures custom vacuum feedthroughs and hermetic bulkhead feedthroughs, including multi-pin configurations, glass-to-metal and ceramic-to-metal seals, and vacuum-rated assemblies. The company also supplies hermetic connectors, headers, hermetic packages, and battery end seals to support fully integrated systems. With rigorous testing and precision engineering,  Complete Hermetics delivers vacuum solutions customers can depend on.

Hermetic Headers for Reliable Electrical Interconnections

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What Are Hermetic Headers?

Hermetic headers are sealed electrical terminals designed to allow power or signal transmission into or out of a hermetically sealed device while preventing moisture, gas, or contaminants from entering. They serve as a critical interface between internal electronics and external connections, maintaining airtight integrity even in harsh operating environments. Hermetic headers are commonly used in batteries, sensors, medical devices, and microelectronic assemblies where reliability is essential.

TO Headers and Energy Applications

One of the most common forms of hermetic headers is the TO (Transistor Outline) header, widely used in microelectronics, sensors, and optoelectronic devices. In energy storage applications, battery hermetic headers, battery end seals and capacitor end seals provide safe electrical pathways while containing internal gases and preventing leakage. These headers are critical to battery safety, performance stability, and long service life.

Design and Manufacturing Precision

Hermetic headers must accommodate varying pin counts, spacing requirements, and electrical loads while maintaining leak-tight performance. Precision glass-to-metal or ceramic-to-metal sealing ensures each terminal remains electrically isolated and mechanically secure. Materials such as Kovar, stainless steel, Alloy 52, titanium, and aluminum are selected based on thermal expansion compatibility and corrosion resistance.

Compact Design with High Reliability

Hermetic headers enable compact device architectures without sacrificing environmental protection. Despite their small size, they must withstand vibration, thermal cycling, pressure changes, and mechanical stress. This makes them ideal for space-constrained applications such as implantable medical devices, aerospace sensors, and portable instrumentation.

Safety and Durability

By preventing moisture ingress and gas leakage, hermetic headers enhance safety and reliability in mission-critical systems. Properly engineered headers reduce the risk of short circuits, corrosion, and premature failure in demanding environments.

Contact Complete Hermetics

Complete Hermetics manufactures high-quality hermetic headers, including TO headers, battery end seals, along with glass-to-metal and ceramic-to-metal sealing solutions. The company also offers hermetic connectors, feedthroughs, vacuum viewports, and custom hermetic assemblies for aerospace, defense, medical, energy, and industrial applications. From prototype to production, Complete Hermetics delivers precision-engineered headers designed for long-term reliability.

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Hermetic Packages for Semiconductor and High-Reliability Electronics

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Purpose of Hermetic Packages

Hermetic packages are designed to protect sensitive electronic and semiconductor components from moisture, contaminants, pressure, and environmental stress. Even small amounts of moisture or oxidation can significantly degrade electronic performance, making hermetic packaging essential for long-term reliability in critical systems.

Semiconductor and Power Packaging

Semiconductor hermetic packages are commonly used for RF modules, MEMS sensors, laser diodes, photonic devices, and high-speed electronics. Hermetic power packages support high-current and high-voltage applications, incorporating robust materials and sealing technologies to handle thermal and electrical loads safely and efficiently.

Thermal Management and Materials

Hermetic packages often integrate materials such as copper tungsten, copper molybdenum, Kovar, stainless steel, and ceramics to balance heat dissipation with structural stability. Effective thermal management is critical to maintaining performance and preventing premature device failure, especially in power and RF applications.

Environmental Isolation and Stability

By creating a controlled internal environment, hermetic packages prevent moisture absorption, oxidation, and contamination. This isolation helps preserve calibration accuracy, signal integrity, and electrical stability over the product’s lifespan. Hermetic packaging also supports long-term storage and deployment without performance degradation.

Integration and High-Density Designs

Modern hermetic packages may incorporate multiple electrical feedthroughs, RF connectors, or optical windows while maintaining airtight integrity. These integrated designs allow complex electronic assemblies to operate reliably in compact form factors.

Contact Complete Hermetics

Complete Hermetics manufactures hermetic packages for semiconductor, RF, photonic, and power electronics, along with glass-to-metal and ceramic-to-metal feedthroughs,  hermetic connectors, and hermetic headers. The company also offers vacuum feedthroughs, battery end seals, TO headers,  and power packages to support fully integrated solutions. From design collaboration to production, Complete Hermetics delivers high-reliability hermetic packaging for the most demanding applications.

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Ceramic-to-Metal Seals for High-Temperature and High-Voltage Systems

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When Ceramic-to-Metal Seals Are Required

Ceramic-to-metal seals are selected when operating conditions exceed the temperature, voltage, or durability limits of glass-to-metal sealing technologies. These seals are engineered for extreme environments where high electrical isolation, thermal stability, and long-term reliability are essential. Applications involving high voltage, high temperature, vacuum, or radiation exposure often require ceramic sealing solutions to ensure performance and safety.

Advanced Ceramic Sealing Technology

Ceramic-to-metal seals are typically manufactured using high-purity alumina ceramics combined with metallization and brazing processes. The ceramic provides exceptional dielectric strength and thermal resistance, while the metal components ensure mechanical integrity and compatibility with system housings. This combination allows ceramic seals to maintain hermeticity under severe thermal cycling and electrical stress.

Mechanical and Electrical Performance

Unlike glass, ceramic materials maintain dimensional stability at very high temperatures and exhibit minimal deformation under load. This makes ceramic-to-metal seals ideal for applications where electrical insulation must remain stable over extended operating periods. Their resistance to arcing and electrical breakdown further enhances safety in high-voltage systems.

Extreme Conditions and Long-Term Stability

Ceramic-to-metal seals also perform exceptionally well in vacuum and radiation-sensitive environments due to their low outgassing and material purity. While these seals are more complex and time-intensive to manufacture than glass seals, their durability and performance justify their use in mission-critical systems where failure is unacceptable.

High-Performance Applications

Common applications include aerospace propulsion systems, medical imaging probes, vacuum chambers, semiconductor processing equipment, high-temperature sensors, and defense electronics. These environments demand sealing solutions that can withstand prolonged exposure to heat, pressure, and electrical stress without degradation.

 

Contact Complete Hermetics

Complete Hermetics designs and manufactures custom ceramic-to-metal seals and feedthroughs, along with glass-to-metal seals,  hermetic connectors, hermetic headers, and hermetically sealed packages for extreme environments. The company also supports specialized requirements with custom hermetic feedthroughs, power packages, and custom hermetic solutions tailored to demanding applications. By combining advanced materials with precision engineering, Complete Hermetics delivers sealing technologies customers can rely on.

Glass-to-Metal Seals for Precision Hermetic Technology

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How Glass-to-Metal Seals Work

Glass-to-metal seals are created by heating glass to a molten state and bonding it directly to metal under carefully controlled conditions. As the materials cool, the glass forms a strong, hermetic bond with the metal, creating an airtight and electrically insulating seal. This process allows electrical conductors to pass through metal housings without permitting moisture, gas, or contaminants to enter the sealed environment. Because of their proven reliability, glass-to-metal seals remain one of the most widely used hermetic sealing technologies across multiple industries.

Performance Advantages of Glass Sealing

One of the key advantages of glass-to-metal seals is their ability to maintain hermetic integrity under pressure changes, humidity exposure, and moderate temperature extremes. Glass provides excellent dielectric strength, corrosion resistance, and chemical stability, making it suitable for long-term use in harsh environments. Compared to epoxy or mechanical sealing methods, glass-to-metal seals offer significantly longer service life and more predictable performance over time.

Material Compatibility and Stability

Successful glass-to-metal sealing depends on matching the coefficient of thermal expansion (CTE) between the glass and metal components. Materials such as Kovar, Alloy 52, stainless steel, and copper-based alloys are commonly used to achieve this balance. When properly engineered, these seals tolerate thermal cycling and mechanical shock without cracking or leakage, making them suitable for both static and dynamic applications.

Manufacturing Precision and Repeatability

Glass-to-metal sealing requires precise control over glass composition, firing temperature, and cooling rates. This level of control ensures consistent quality and repeatability across production runs. As a result, glass-to-metal seals are ideal for both prototype development and high-volume manufacturing, allowing manufacturers to scale production without sacrificing reliability.

Common Applications

Glass-to-metal seals are widely used in glass-to-metal sealed lids, battery end seals, capacitor end seals, sensors, medical implants, and industrial electronics. They are also commonly found in automotive systems, pressure sensors, and energy storage devices where cost-effective hermetic performance is required.

 

Contact Complete Hermetics

Complete Hermetics is a custom manufacturer of hermetic sealing solutions, specializing in glass-to-metal seals, ceramic-to-metal seals, hermetic connectors, hermetic feedthroughs, hermetic headers, TO headers, vacuum feedthroughs, and battery end seals. The company designs and produces hermetically sealed components and custom hermetic assemblies for aerospace, defense, medical, energy, and telecom applications, delivering reliable performance in extreme environments from prototype development through full-scale production, backed by deep engineering expertise.