Custom silicone button carbon pucks for silicone keypad

Conductive carbon pucks used with a silicone keypad need to align with the intended circuit contact pattern. Their position and relationship to the moving rubber section should be developed together so a press brings the designated surfaces into contact without unwanted sideways movement.

Define the keypad geometry using the actual board, enclosure and stack height. Check the approach of the contact area under normal finger positions, including any tilt caused by a key rubbing against the housing. A carbon contact construction does not establish a particular resistance or operating life by itself.

Evaluate activation and release in the complete assembly. Keep the conductive areas clean during fitting and avoid abrasive handling that changes their surface. During service, inspect for contamination and wear as well as alignment before replacing the visible rubber alone. A replacement keypad should preserve the designated carbon contact and underside geometry so matching key tops do not conceal a different electrical interface beneath the panel.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Evaluate activation and release in the complete assembly.

Custom dimensions

Check the approach of the contact area under normal finger positions, including any tilt caused by a key rubbing against the housing.

Fit & assembly

Conductive carbon pucks used with a silicone keypad need to align with the intended circuit contact pattern.

Use & inspection

During service, inspect for contamination and wear as well as alignment before replacing the visible rubber alone.

Photos illustrate structure or material only. A carbon contact construction does not establish a particular resistance or operating life by itself. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.