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The assembled plastic keypads (API) combine plastic keys with a silicone base. The plastic keys can be transparent with printing on the backside, spray-coated or metalization. The silicone base is made of translucent material giving an excellent backlighting.

As to the assembly there are several ways for attaching the keys to the silicone:

(1) transparent plastic keys, printed at the backside that are glued to the silicone
(2) plastic keys pushed onto the silicone ("push-fit")

This type of keypad can be used in combination with PET- or metal domes and is widely used in mobile phones, automotive and payment terminals.
Main features:

• if printing is at backside of keys: no abrasion of symbols
• very good backlighting
• dirt and grease cannot penetrate the key top