Custom silicone control button conductive keypad

A silicone control button combines a molded user contact surface with a switching arrangement beneath it. This custom keypad offering includes conductive constructions, such as carbon pill contacts and conductive ink, alongside non-conductive designs used with a separate switching element. Selecting that interface early helps keep the mechanical layout consistent with the electronic circuit.

For a conductive design, the contact shape and location need to correspond to the board beneath each key. The flexible web must allow a press to reach the contact without making the key remain active after release. Where the rubber operates a separate switch, the underside instead needs to deliver movement to that switch at the intended position. These two constructions should be evaluated as different assemblies, even when their visible key tops look similar.

The silicone control button can carry symbols, numbers or text through screen printing or laser etching, depending on the chosen construction. Decide which functions need to be recognized first, then place the legends where the housing will leave them visible. A wide symbol on a narrow key may become difficult to read once the keypad is fitted.

Trial the complete control with its front panel and board secured. Check every key for release after an off-center press, and keep handling residues away from the conductive surfaces while assembling the unit.

Material options

Silicone. Custom formulation and color for the intended contact conditions.

Hardness selection

Silicone: 20–80 Shore A. The flexible web must allow a press to reach the contact without making the key remain active after release.

Custom dimensions

Where the rubber operates a separate switch, the underside instead needs to deliver movement to that switch at the intended position.

Fit & assembly

Check every key for release after an off-center press, and keep handling residues away from the conductive surfaces while assembling the unit.

Use & inspection

The silicone control button can carry symbols, numbers or text through screen printing or laser etching, depending on the chosen construction.

Photos illustrate structure or material only. For a conductive design, the contact shape and location need to correspond to the board beneath each key. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.