Custom manufacturing example · Custom made soft carbon pucks for silicone rubber keypads

CUSTOM RUBBER & SILICONE MANUFACTURING

Custom made soft carbon pucks for silicone rubber keypads

A custom component for your assembly.

Define the mating surfaces, dimensions and working conditions. ETOL manufactures the part to the agreed design and material.

Factory direct
Made to order
Drawing & sample support

Share the part, its application and your estimated quantity.

Customize the fit, material and finish

Vulcanization workshop illustration with green molding presses and blue collection bins

Material & hardness

Selected for the contact, temperature and movement

Color & finish

Define the visible surfaces and intended color

Shape & dimensions

Develop holes, lips and walls around the mating parts

Mounting & fit

Match the attachment and installation method

Product Overview

Carbon pucks provide the contact elements used beneath keys in a silicone rubber keypad arrangement. Their custom size and shape should match the intended circuit contact area and the molded key geometry. The contact component needs to be evaluated as part of the complete keypad rather than as a loose piece alone.

Check the puck position, thickness, and relationship to the board when the key is relaxed and when it is pressed. The surrounding rubber and the enclosure determine the available travel. A contact placed off-center or held too close to the circuit can change operation even if the visible button looks correctly aligned.

Keep the contact surfaces clean during handling and assembly. Avoid contaminating them with oils, dust, or an unsuitable adhesive. Test the complete interface after the housing is secured, checking both successful input and release. Electrical requirements belong to the particular keypad and circuit design; the term carbon contact does not establish a universal resistance or operating life. Inspect the molded assembly and its seating if operation changes after the device has been opened or reassembled.

Material options: Silicone. Custom formulation and color for the intended contact conditions.
Hardness selection: Silicone: 20–80 Shore A. Check the puck position, thickness, and relationship to the board when the key is relaxed and when it is pressed.
Custom dimensions: A contact placed off-center or held too close to the circuit can change operation even if the visible button looks correctly aligned.
Fit & assembly: Inspect the molded assembly and its seating if operation changes after the device has been opened or reassembled.
Use & inspection: Keep the contact surfaces clean during handling and assembly.

Photos illustrate structure or material only. Carbon pucks provide the contact elements used beneath keys in a silicone rubber keypad arrangement. ETOL directly manufactures custom-shaped silicone and rubber parts to your requirements.

Choosing a material or hardness? Explore the selection guide →

From part requirements to production

Define the part

Identify key dimensions, mating surfaces and quantity

Review material & tooling

Agree the compound and manufacturing approach

Evaluate the sample

Review the fit and agreed requirements in the assembly

Produce & inspect

Manufacture and check against the approved requirements

Review the intended assembly

Working conditions

Identify temperature, contact fluids and repeated movement.

Material and structure

Consider hardness together with wall thickness and support.

Installation

Check access, mating dimensions and the fitting sequence.

Ordering this custom component

Can the shape be adjusted to my mating parts?

Yes. Show the receiving opening, contact surfaces and clearance limits. We can review the dimensions and retaining features around the intended fit.

Which details should be agreed before tooling?

Agree the critical dimensions, material, hardness, visible surfaces and sample requirements. Explain how the part is installed and which interfaces control its function.

Can a sample help define the replacement?

A sample can help explain the structure. Compare it with the assembly because wear, swelling or compression may have changed its original dimensions.

How is the quotation for this part determined?

The material, part geometry, tooling, quantity and finishing affect the quotation. Include the intended batch size and delivery destination when describing your requirements.

DISCUSS THIS COMPONENT

Describe the part you need.

Share the fit, operating conditions and quantity with our manufacturing team.