It is a pretty well-known fact that space manufacturers and design engineers spend countless hours testing critical components in their launch vehicle systems such as cryogenic applications where leakage rate remains one of the most challenging and dangerous elements. If the leakage rate becomes too high, this can cause catastrophic failure. This is the reason rocket sealing solutions, especially those used in tanks and feedlines, must meet very stringent specifications. Aside from leakage rate, it is important to note that cryogenic systems are subject to other performance stressing factors that must also be considered in order to secure a well-balanced solution. Weight of the hardware and ease of installation are two other important factors to be discussed, both of which depend on the compression force required to compress the seal during assembly. Other factors, such as spring back after deflections and the ability to perform in dynamic applications, are other critical criteria that can increase the performance life of a seal. One must also consider cycling to high temperature or high pressure, chemical compatibility and need of non-circular shapes when choosing the best sealing technology for a specific application.