Custom Silicone Button Customization with OEM ODM Options

Hardness is not feel

The most common specification mistake is treating durometer as the feel knob. A 40 Shore A button on a stiff dome feels harder than a 60 Shore A button on a soft one, because what the finger reads is the force curve, not the material. Hardness changes the bottom-out feel and the sealing force; the dome changes the snap.

Within the 30A–80A range we run, the low end suits sealed interfaces that need to conform to a housing and the high end suits small keys that must not deform under a thumb. Neither end makes a button feel crisp on its own.

The dome, the web and the travel

A silicone button snaps because the dome buckles. The ratio between dome height and web thickness sets how sharply it buckles, and the gap between the button and the PCB sets how far the finger travels before it does. Shorten the travel and the key reads crisper but becomes less tolerant of housing tolerances; lengthen it and the key feels mushy but forgives a badly moulded housing.

This is why we ask for the housing and the PCB, not just the artwork. The keypad is a spring in a mechanical system, and the system includes the parts around it.

Legends that survive the application

Pad print is fast and cheap and sits on the surface. UV print gives a sharper edge and better opacity. Laser etching cuts into the compound, so the legend cannot rub off but reads lower in contrast. Embossing puts the symbol in the tool — the most durable route and the least flexible, because a legend change is a tool change.

The choice usually follows the cleaning regime. A medical or industrial panel wiped with solvent daily needs an etched or embossed legend. A consumer remote with a five-year life is fine with a well-cured print.

One programme, many interfacesRemotes, instrument panels and handheld controllers come off the same press — what changes is the tool, the dome layout and the legend route.

Sealing is an assembly claim

A silicone keypad can be the seal, but only if the flange, the housing groove and the screw torque are designed for it. A keypad that passes an IP67 test on a machined sample can still leak in production if the housing is moulded with a different flatness — the mechanism is covered in lab pass versus field pass.

Tooling and quantity

Prototype quantities from a single piece are possible where the geometry suits an existing tool or a soft tool; production runs on steel. Decoration is not a cosmetic decision alone — etched legends, embossed symbols and backlight windows all change the tool, so the artwork review happens before the cut, not after.

Small keys ask for a harder compoundBelow a certain key size the wall cannot carry a soft compound without collapsing under a thumb — which is why small keys trend to the upper half of the hardness range.

Dongguan Bohao Electronic Technology Co., Ltd. IATF 16949:2016 / ISO 9001:2015 certified. Values are typical for the compound or platform described; the approved drawing and sample govern production.