Metal domes arrays are a tactile interface between the user and keyboard. They are made of a pre-cut polyester adhesive and domes (polyester adhesive 0.05mm thick with a 0.03mm thick sheet of acrylic adhesive).
Domes arrays are applied to the PCB after peeling off the backing and aligning the array in one single operation.
2 types of domes arrays are mainly used: arrays with KISSCUTS (series of cuts around the dome in the polyester for a better adherance & ventilation of the dome) and arrays with P.A.S., an additional layer applied under the retaining layer with
channels enabling a higher volume of air around the domes arrays.