With 50 years experience, Concept Group is your reliable glass to metal seal manufacturer. We take the job from start to finish including design support, machining, and joining. Our seals, connectors, and hermetic feedthroughs are tested to the highest quality standards for superior hermeticity and electrical performance. We deliver an oxide-free final product, so our seals are immediately weldable and ready to be integrated into your assembly out of the box.
Glass to Metal Hermetic Seals
Hermetic Seals, Connectors, and Headers
What makes our glass to metal compression seals different?
There are many types of glass to metal seals, and differences can have a dramatic effect on performance. Our seals, feedthroughs, and connectors are made with stainless steel. With unmatched compression, our hermetic seals are suitable for a wide range of challenging environments including high pressure and high temperatures.
- We ensure our seals are completely airtight, testing for hermetic performance at orders of magnitude higher than competitors.
- Our rigorous inspection process holds parts to higher standards, resulting in seals with more reliable electrical performance.
- Our seals use special, dense glasses that give a mechanically stronger, longer lasting seal.
- Concept Group produces weld-ready, untarnished, oxide-free seals that require no additional cleaning.
- Our manufacturing process eliminates bubbles and voids, creating seals of even greater density and reliability.
- Concept Group’s plating shop exclusively plates glass to metal seals.
Frequently Asked Questions
What does it mean for seals to be weld-ready?
If your company does secondary welding, joining the seals to packages and other assemblies, you should use untarnished, weld-ready seals.
The manufacturing process used by many hermetic seal suppliers can leave a tarnish residue on metal parts. This thin tarnish layer melts at higher temperatures than welding metal, so it isn’t eliminated during your secondary welding. When you weld the tarnished seal into your packages and other sub-assemblies, the tarnish can get trapped in the new weld, producing a weld defect that’s very difficult to detect, even with radiography. This defect weakens the weld and can cause cracking and subsequent performance failure.
When is it important to use special, dense glasses?
If your applications deals with high temperatures or high pressures, it’s important to select seals that are made with especially dense, strong glass. These denser glasses resist the cracking and other performance breakdowns that can occur when less dense glasses are subjected to such extreme conditions.
Your hermetic seals should also be manufactured under conditions of increased positive pressure. This positive pressure manufacturing process creates glasses of even greater density and reliability, by eliminating bubbles and voids that would likely remain if the manufacturing were done at lower or ambient pressures.
Do we clean incoming hermetic seals?
Many companies have to clean their incoming seals before they forward them to manufacturing. Tarnish on the seals’ metal surfaces can cause defects in your secondary welds, and these defects can produce weld cracking and other performance failures. That’s why the tarnish should be removed before you begin welding.
However, cleaning glass to metal seals takes up valuable time, and that’s an added cost for your company. To eliminate this added cost, use weld-ready, tarnish-free hermetic seals that don’t need additional cleaning. In fact, in most applications, our seals can be used right out of the shipping container.
What if my glass to metal seals require plating?
Because most plating shops plate everything from door knobs to car bumpers, they can be a significant source of cross contamination. Impurities from such contamination can result in your hermetic seals blistering and turning brittle. The plating process can even deposit particulate contaminants, leading to rust.
If you need plating, it’s best to use an operation that specializes in plating glass to metal hermetic seals, one that works on nothing else. That way, you can be certain not only that the risk of cross contamination is eliminated, but also that your precision made seals are handled with appropriately rigorous quality control standards.
The Concept Group Difference
Hermetic seals can play a highly leveraged role in overall system performance. Concept Group engineers are available to provide support in order to optimize functional performance of our seals in your system.