silicone switch keystroke/touch buttons with conductive carbon pill

Touch buttons with conductive carbon pill features use the underside contact to interact with a matching circuit pattern. The molded silicone geometry must bring that contact to its target during a press and separate it afterward. The touch-button description does not by itself establish a capacitive sensing method.

Check the pill position, key travel and board spacing together. A button may appear centered in the housing while the underside contact is offset from the circuit. The surrounding opening should also leave the flexible wall free to move rather than hold the key partly pressed.

Evaluate the completed input for a clear response and full release under the intended pressing action. No particular contact resistance or operating life is established by the material category alone. During handling, protect the conductive surface from dirt and abrasive cleaning. If the assembly is reopened, restore the locating features before checking operation so a shifted sheet is not mistaken for failure of the carbon contact.

Material options

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

Hardness selection

Silicone: 20–80 Shore A. Evaluate the completed input for a clear response and full release under the intended pressing action.

Custom dimensions

Check the pill position, key travel and board spacing together.

Fit & assembly

If the assembly is reopened, restore the locating features before checking operation so a shifted sheet is not mistaken for failure of the carbon contact.

Use & inspection

During handling, protect the conductive surface from dirt and abrasive cleaning.

Photos illustrate structure or material only. The surrounding opening should also leave the flexible wall free to move rather than hold the key partly pressed. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.