Silicone electronic keypad with conductive carbon pill

A conductive carbon pill forms the contact feature beneath a compatible silicone electronic key. When the key moves in its intended assembly, that feature meets the corresponding circuit area. The molded keypad and the board layout must agree in both position and operating travel.

Check the pill location relative to the key's support geometry. A key that tilts substantially during an edge press can bring the contact down differently from a central press. The housing should guide the movement without trapping the flexible wall or holding the key partly depressed at rest.

ETOL customizes the keypad dimensions and color around the electronic product. Define the contact arrangement together with the molded shape rather than treating the conductive feature as an interchangeable addition to any button. During assembly, protect the underside from oils, dust and adhesive. Verify the response with the actual board after the case is closed.

If a key becomes intermittent, inspect the seating, travel and contact cleanliness before changing any surface. Scraping or coating the pill can change the electrical interface. A correct replacement should preserve the contact placement and key geometry that the board was designed to use.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. A key that tilts substantially during an edge press can bring the contact down differently from a central press.

Custom dimensions

Define the contact arrangement together with the molded shape rather than treating the conductive feature as an interchangeable addition to any button.

Fit & assembly

Check the pill location relative to the key's support geometry.

Use & inspection

If a key becomes intermittent, inspect the seating, travel and contact cleanliness before changing any surface.

Photos illustrate structure or material only. The housing should guide the movement without trapping the flexible wall or holding the key partly depressed at rest. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.