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Epoxy or Glass Sealed?

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b2ap3_thumbnail_iStock_000008668992_Large-Chess_blog_20140909-135653_1.jpgThere are many factors to take into consideration when planning to use a sealed connector. While Amphenol always has specialists standing by to answer your technical questions, we figured we’d use this opportunity to answer the single most basic matter that arises when sealing requirements arise: Epoxy, or Glass-Sealed?

Each design has its benefits and its detriments, which makes the answer to the question very application-specific. Depending on the requirements and the end-use environment, our recommendations could change – even between connectors on the same platform. So, what are some of the main factors to take into account when making this decision?


Glass-sealed (or hermetic) connectors utilize a fused glass insert that are rated for IP68 – or a 1x10-7 cc He/secleak rate. Such well-sealed connectors are perfectly suited for rugged, high-performance uses, such as space-based or deep-sea applications. Epoxy-backfilled connectors, in contrast, are rated for IP67 – or a 1x10-5 cc He/sec leak rate. These connectors are perfect for use in applications where low depth submersion (3-4 meters) is required or sustained, and can be supplied with 100% leak-testing completed.


Glass-sealed connectors are provided with stainless steel shells and are incredibly rugged. Amphenol glass-sealed connectors can withstand anything thrown at them. They are rated for operation in sustained temperatures of up to 260˚C and are oil and fuel resistant. Epoxy-backfilled connectors are less resistant to corrosive materials, cannot be used in nitrogen environments, and only rated for operation in temperatures of 150˚C. However, their aluminum shells and lighter construction make them ideal for applications where weight savings is crucial.


The final factor to consider is your budget. The rigid manufacturing processes utilized in the production of glass-sealed connectors and the materials used make them are more expensive than their MIL-DTL-38999 and epoxy-backfilled counterparts. If the budget is tight, consult the experts at Amphenol. Once we know your requirements, we will be able to recommend the most cost-effective solution for your application.

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Erica Moyer is the Product Line Manager for Filter and Sealed Product at Amphenol Aerospace. She has a Bachelor of Science in Marketing from SUNY Plattsburgh. Erica began her career at Amphenol Aerospace after graduating in 2007, initially starting out as a filter product trainee.

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Guest Wednesday, 16 January 2019

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