Conductive carbon pill rubber buttons/silicone keypad button

Conductive carbon pill rubber buttons use a moving contact element beneath the silicone keypad surface. The custom geometry should align that element with the intended circuit board contact while leaving a usable pressing area above. The visible key shape and hidden contact position need to be developed as one interface.

Check alignment after the board and enclosure are fastened. The pad can shift during closing even when it looked centered beforehand. Assess presses near the edges of the usable top to see whether the contact still reaches its intended area and returns cleanly afterward.

The flexible section needs clearance to move without rubbing against the panel or pulling a neighboring key down. Evaluate electrical input with the intended circuit rather than assigning a universal value to the carbon contact. If operation changes, distinguish between mechanical travel, contact alignment and the condition of the board surface.

Handle the underside carefully during assembly. Keep particles and cleaning residue away from the carbon elements, and avoid scraping them while positioning the sheet. Inspect the flexible regions for folds before the housing is closed. A properly located contact and unobstructed key movement are both needed for the completed button to perform its assigned function.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. The custom geometry should align that element with the intended circuit board contact while leaving a usable pressing area above.

Custom dimensions

The flexible section needs clearance to move without rubbing against the panel or pulling a neighboring key down.

Fit & assembly

Check alignment after the board and enclosure are fastened.

Use & inspection

Keep particles and cleaning residue away from the carbon elements, and avoid scraping them while positioning the sheet.

Photos illustrate structure or material only. A properly located contact and unobstructed key movement are both needed for the completed button to perform its assigned function. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.