JOMESA filter mounts consist of a plastic backside and glass cover on the frontside.
The backside can be used for information.
Filter membranes vary in thickness and must be underlayed by a paper to prevent slipping.
This paper underlay is helpful also for centering the filter.

The glass frames are washed in an industrial washing machine, and dried in a HEPA
filtered air flow. After washing and drying the Filter-Mounts are assembled in a class 7 cleanroom.