Often times, membrane switches are simply embossed which is the process of raising the key area using magnesium membrane switch overlay embossing dies. A popular alternative to embossing the overlay material is using epoxy keys.

Epoxy keys are applied using a precise dispensing process. Epoxy keys are typically used for aesthetic purposes giving the membrane switch a clean look and really making the keys pop. Epoxy keys are still raised off of the surface allowing the user to easily locate the keys similar to an emboss.

Epoxy keys are also utilized when there are space constraints around the keys. If the keys are too close together or close to the edge of the part, there often times isn’t enough space to emboss due to adhesion issues. The epoxy keys ensure there is enough adhesion around the keys to prevent delamination.