Polymers and epoxies: high permeation rates and natural aging
While many everyday applications use polymers, epoxies, or PEEK as sealing or packaging materials, they do not offer true hermeticity and must always be considered non-hermetic.
The core downside of these materials is that they are organic in nature, which means they have an inherently high permeation rate. They age naturally over time and will eventually allow moisture to penetrate into a sealed system. This aging process progresses even more quickly under environmental influences such as high temperature, pressure, or chemicals, which can lead to severe leakage issues caused by the sealing materials.
In addition, outgassing during the curing process or during operation can compromise the ambient environment, leading to critical rates of vapor pressure, moisture levels, and condensation.
In practice this means non-hermetic packages are typically used for applications with lower reliability and operational requirements. Hermetically sealed components, on the other hand, can fulfill enhanced needs for longevity, harsh environment reliability, as well as performance and efficiency increases.