Moxtek is a leading manufacturer of X-ray windows for low energy X-ray detection. Moxtek manufactures ultra-thin polymer X-ray windows that are attached to metal mounts which house energy dispersive X-ray detectors such as Silicon Drift Detectors (SDDs). These windows allow for transmission of low energy X-rays while maintaining a hermetic seal critical for the X-ray detector’s performance. It is well known that no material is a perfect gas barrier and gasses will diffuse through window assemblies over time. Were showing the results of the analysis of hermetic seal of structure X-ray windows after the processes of chemical and plasma purifications.