Hermetic sealing epoxy

A hermetic seal is any type of sealing that makes a given object airtight preventing the passage of air, oxygen, or other gases. The term originally applied to airtight glass containers, but as technology advanced it applied to a larger category of materials, including rubber and plastics. Hermetic seals are essential to the correct and safe functionality of many electronic and healthcare products.

Used technically, it is stated in conjunction with a specific test method and conditions of use. The word hermetic comes from the Greek god Hermesvia the vocabulary of alchemy. The alchemists invented a process for making an airtight glass tube, which they used for distillation. The process used a secret seal, whose invention was attributed to an inspiration of alchemy, Hermes Trismegistus. Some kinds of packaging must maintain a seal against the flow of gases, for example, packaging for some foods, pharmaceuticals, chemicals and consumer goods.

The term can describe the result of some food preservation practices, such as vacuum packing and canning. Packaging materials include glassaluminum cansmetal foils, and gas impermeable plastics. Some buildings designed with sustainable architecture principles may use airtight technologies to conserve energy.

Hermetic Sealing with Epoxy

Under some low energy buildingpassive houselow-energy houseself-sufficient homeszero energy buildingand superinsulation standards, structures must be more air-tight than other lesser standards. Air barriers are not effective if construction joints or service penetrations holes for pipes, etc. Airtightness is a measure of the amount of warm or cool air that can pass through a structure.

Mechanical ventilation system can recover heat before discharging air externally. Green buildings may include windows that combine triple-pane insulated glazing with argon or krypton gas to reduce thermal conductivity and increase efficiency.

Airtight implies both waterproof and vapor-proof. Applications for hermetic sealing include semiconductor electronicsthermostatsoptical devicesMEMSand switches. Electrical or electronic parts may be hermetic sealed to secure against water vapor and foreign bodies to maintain proper functioning and reliability. Hermetic sealing for airtight conditions is used in archiving significant historical items. InThe U.

hermetic sealing epoxy

ConstitutionU. Declaration of Independenceand U. Bill of Rights were hermetically sealed with helium gas in glass cases housed in the U. National Archives in Washington, D.Hermetic sealing is the process of creating a container of some sort that is airtight.

Hermetic vs “Near Hermetic” Packaging A Technical Review

That means that any material in the container, whether it's a gas, liquid, or solid, will not leak from the container. Hermetic sealing is commonly used to encase electrical mechanisms, as well as to contain functional gases. Topics: hermetic sealing. Request a Demo. Free Lab Service. Government Information. ISO Certificate. Types of Hermetic Sealing There are many different types of airtight seals that have various applications depending on the industry it's being used for.

Often used for common household items such as halogen or neon light bulbs, the process seals the glass to a metal surface to contain the gas. There are two types of glass-to-metal seals; which process is used depends on the type of materials being used. Matched Seals : Used in light bulbs mainly, matched seals are formed when the glass and the metal have the same coefficient of thermal expansion. The seal's strength is sourced from the bond between the glass and the formations of oxide on the metal.

This type of seal tends to be weaker since it cannot withstand high-pressure fluctuations between the two materials.

Compression Seals : These seals are the stronger of the two and can withstand high-pressure differentials and types of physical stress such as shock.

Alternatively to matched seals, compression seals take place when the coefficients of thermal expansion are different and therefore the metal forms around the glass. Ceramic-to-Glass This seal is a high-pressure alternative to glass seals and is often used in applications that put large amounts of stress on the seal itself.

hermetic sealing epoxy

Epoxy Seals Epoxy resins are often used in vacuum seals and are commonly used to seal copper, brass, and other materials. They allow for more design flexibility but have a much smaller window of temperature variation and therefore epoxy seals are only feasible in certain applications.

For many hermetic seals, the operator can use induction heating to create the seal depending on the application.

Induction is a form of non-contact heating and is used in processes with a temperature variance of between and degrees Fahrenheit. Much like hermetic sealinginduction sealing and induction cap sealing are used to seal containers, albeit in a much more temporary way.

These types of induction heating are commonly used for applications such as tamper-evident seals as well as cap sealing for the medical industry. Written by Brett Daly. Four Ways to Contact Ambrell for Support. Give Us a Call. Send an Email.Abstract: Hermetic cavity packages have long been the standard for military and space applications. On one hand the hermeticity specs are getting tighter, on the other hand the question that is now being posed is; Do I need to be hermetic?

In the context of microelectronics it implies an airtight seal that will keep moisture and other harmful gases from penetrating the sealed package. Metals, ceramics and glasses are the materials used to form the hermetic seal and prevent water vapor from accessing components inside the package.

A properly made hermetic seal with a sufficiently low leak rate can keep a package dry and moisture free for many years. Learn more by reading our Hermeticity FAQ. There are several techniques for testing hermeticity, but the most common method is to measure the rate at which helium escapes from a package that has been pressurized or backfilled with helium the tracer gas.

The exact definition of hermetic is defined in TM para. Download a Practical Guide to TM Polymeric materials such as silicones and epoxies do not provide a hermetic seal and cannot be used to improve or fix a hermetic seal. Cavity packages made from polymers e. These two similar terms are used interchangeably in this document. If liquid droplets form on the surface of an IC or other active devices sensitive to moisture, then corrosion or other electrochemical reactions may occur and degrade the performance of the device and lead to failure.

Moisture droplets can form as the package is cooled below the dew point. This surface water H2O combines with any available surface ionic contamination, particularly sodium Na or chlorine Cland along with a bias will chemically attack and corrode exposed aluminum metal at the wirebond pad.

The conductor metallization beneath defects, such as, cracks or pinholes in device passivation, or thin film resistor networks are also susceptible to this type of failure mechanism. Three monolayers of moisture on the surface is all that is needed to sustain surface conduction and facilitate electrochemical reactions REF 2. In addition, every year since the early s the Minnowbrook conference is held in upstate NY at the town of Blue Mountain Lake to discuss hermeticity and the associated problems with moisture in a package.

hermetic sealing epoxy

Contact the author for more information on the Minnowbrook Conference. Microelectronic components used in military, space and Class III implanted medical devices, such as pacemakers, have historically demanded the highest possible levels of quality and reliability especially in life-critical applications.

Early semiconductor devices and thin film resistor networks were very prone to moisture related failures. Several major military programs experienced system level failures due to moisture related problems at the component level. Small resistors made from nickel and chromium, NiCr thin film resistors, were particularly sensitive and would practically vaporize before your very eyes in a high moisture environment.

As a result organizations, like Rome Air Development Center RADC spearheaded efforts to develop test techniques to measure air leak rates and the corresponding build up of moisture in the package REF 3. The theory was, and is, to keep the moisture content within the package sufficiently low enough to avoid condensation of water droplets onto the surface of the device.I have read and agree to the Terms of Use and Privacy Policy.

Hermetic Connectors. Home Hermetic Connectors. Hermetic connectors are used to separate high-pressure, corrosive, or high-temperature conditions on one side of an inert vacuum or atmosphere to the other side. These connectors can also be used to maintain a delicate pressure differential between two environments. RHSeals engineers and manufactures a wide variety of hermetically sealed connectors ranging from sealed USB to large multipin mil-spec connectors.

Our connectors are suitable for use in a broad range of industries such as aerospace, automotive, military, and research and may be customized to the precise specifications of your application.

We can create an epoxy hermetic seal around virtually any connector type. Epoxy Sealed Connectors. The primary purpose of a seal is passing electrically conductive wire through a bulkhead without leakage. For decades, the only way to achieve this was attaching the wire to a pin sealed in ceramic or glass. Epoxy seal technology has eliminated the cost and design constraints of ceramic and glass.

By creating an uninterrupted passage, electrical reliability is actually increased and the cost is lowered with our hermetic sealing technology. RHSeals epoxy sealed connectors offer better design flexibility than ceramic-to-metal and glass-to-metal seals along with a lower cost and better performance. Epoxy seals offer outgassing and leak rates comparable to ceramic and suitable for high and low volume applications.

Epoxy connectors are used in a wide range of industries, including semiconductor manufacturing, automotive, aerospace, energy, and medical.

hermetic sealing epoxy

Epoxy seals are replacing glass seals in many applications, including fuel connectors, leak detection systems, and nuclear glove boxes thanks to their high chemical resistance, compressive strength, and ability to withstand temperature cycling and pressure.

RHSeals Hermetic Connectors. Hermetically sealed connectors are gas- and air-resistant and suitable for applications in even extreme or harsh conditions, including high altitude, extreme pressure, and extreme weather.

Hermetic connectors are frequently used in military applications like submarines and unmanned vehicles as well as industrial and commercial uses. Hermetic connectors can thrive under even the harshest conditions and may be used with sensitive sensor and photographic equipment mounted to unmanned aerial vehicles that are exposed to extreme atmospheric pressure, rapidly changing temperatures, high altitude, and other severe weather.

A hermetically sealed connector is impervious to most gases and liquids, including alkalis, oils, acids, gasoline, hydraulic fluid, and jet fluid. They can also withstand shock loads up to Gs without loss of hermeticity and withstand extreme cold or heat without a loss of performance.It used to be difficult to get an airtight seal for distillation and other processes.

Although many companies attempt to use an O-ring or epoxy to get the hermetic sealthere are other processes which work more effectively in certain applications.

We know how to find the right product for your project. Our team of engineers works with you to find the right combination of materials that will meet your specifications. Glass-to-metal seals are extremely effective under some conditions, but higher heat or voltage may require a ceramic-to-metal hermetic sealing solution. When you need the chemicals and gases to be airtight in your application, let us help develop the right seal.

We test each product to ensure its reliability and results before use. Finding the right solution for each application is right in our wheelhouse. Our engineers specialize in creating hermetic sealing for specific projects and prototypes to meet the individual specifications of each product. Our engineers use the latest technology and tools to design and develop hermetic sealing products to fit your needs.

Let us work with your team to get your project moving forward. Creating the Hermetic Sealing for Your Application. Related posts.Ceramic Lids.

Hermetic seal

Epoxy Options. Glass Lids. NRE charges for development of special B-stage epoxies to be custom applications. Because we have a seal you can rely on with specific formulated B- stage epoxies that can adhere to many materials and surfaces on components supplied by either the customer or RJR.

Since our inception, RJR has developed and refined every aspect of proprietary polymer adhesive technology in order to supply proper solutions to our customers.

As a result, we provide unparalleled expertise in automated, controlled processes that maintain structural integrity, protect package contents, and maximize efficiency. Our products range from high-temperature, high-performance B-stage epoxy systems to low-temperature co-polymer systems. In addition, we provide proprietary, high-performance formulations to accommodate specific objectives and processing cycles, as well as custom-designed formulations to maximize yields. In general, we apply our non-conductive and or conductive adhesives to various types of materials, such as metal, glass, ceramic, and plastic materials.

RJR Polymers has long been a value-added supplier of epoxy coated IC covers and components as well as customer furnished material. RJR has made the process of attaching protective lids to electronic packages faster, more reliable, and less expensive since All of RJR materials are custom formulated B-stage epoxies and are applied in-house assuring that the quality and specific performance characteristics are tightly controlled on every batch.

RJR materials have consistently out-performed the competition — high moisture vapor resistance, and helium leak free seals are standard performance characteristics.

Plastic Lids. Open Tooled. Learn More.I have read and agree to the Terms of Use and Privacy Policy. Hermetic Wire Feedthrough Hermetically sealed wire feedthroughs offer numerous advantages. Home Hermetic Wire Feedthrough. Hermetically sealed wire feedthroughs offer numerous advantages over off-the-shelf bulkhead connectors including a lower cost, reduced electrical problems, design flexibility, and a longer lifespan.

RHSeals can design and deliver hermetically sealed wire feedthroughs with a shorter lead time than our competitors to help you realize these benefits over traditional connectors.

Bulkhead connectors are often used to route data and power in isolated environments. Standard bulkhead connectors may be used to pass wires and cables through the walls of vacuum and pressure chambers, but they are rarely the best solution. Sealed bulkhead connectors come with unnecessary design constraints and increased costs, and they can trigger electrical issues. A wire feedthrough that is hermetically sealed with epoxy offers a more flexible solution that saves space and reduces maintenance.

A standard bulkhead connector comes with strict limits on the gauge and number of conductors. Most connectors are very limited on the size of pins or the number of pins available, and it can be difficult to find mixed-gauge connectors. In general, continuous wire feedthroughs save space compared to standard bulkheads. A well-designed wire feedthrough can double the amount of connectors in a given opening. This allows a single feedthrough to combine the signal and power wires from multiple bulkhead connectors.

A feedthrough will not protrude like connectors, which provides greater clearance for moving parts. These feedthroughs pass conductors in a wire harness through a chamber wall with no vacuum or pressure loss. An epoxy sealed wire feedthrough also eliminates issues with voltage drop, contact resistance, and other electrical problems that affect connectors. Because the conductor through the seal is continuous with no solder terminations, hermetic wire feedthroughs offer reliable electrical performance.

Hermetic Seal Laser Welding - Stainless Steel Electronics Package

Epoxy hermetic seals even allow for the use of different types of conductors and wires in the same feedthrough, adding yet another advantage over traditional connectors. A single wire feedthrough with one wire harness may replace numerous standard connectors, each with its own harness. A feedthrough can achieve significant savings by reducing the number of wire harnesses that must be designed, produced, and installed.

Wire feedthroughs can also reduce bill-of-materials, simplify the procurement process, and eliminate the high costs of over-engineering systems around bulkhead connectors when standard models cannot match the exact requirements of an application.

Hermetic seal

While hermetically sealed wire feedthroughs are custom solutions, they come with lower installation costs, reduced maintenance, and better performance than bulkhead connectors. Because most feedthrough applications are meant to be sealed permanently, an epoxy sealed wire feedthrough is a better solution than a bulkhead connector.

In these cases, a robust seal and long-term resistance to mechanical stress without electrical losses should be prioritized over the ability to disconnect the wires. Common applications that can benefit from a wire feedthrough include military ordinance-controlled applications, medical imaging systems, and voltage electrical switches. Wire feedthroughs typically have a longer life than standard bulkhead connectors due to the wear and tear on the connector itself.

Repeated connecting and disconnecting a pair of connectors reduces the lifespan of the connector. If the disconnect is necessary, sometimes it can be added to the end of a wire feedthrough. As the connector wears, it becomes necessary to continue replacing the bulkhead connector.

A wire feedthrough eliminates this wear cycle and lowers the long-term cost. Continuous feedthroughs can also be used in older systems when retrofitting is necessary.