Carbon Pill Conductive Rubber Keypad, 4x4 Matrix, 50 Shore A
This conductive rubber keypad is built on a 4x4 matrix layout with carbon pill contacts moulded directly into each key pad. The conductive carbon pills close the circuit when the key is pressed, giving a clean, chatter-free signal without any metal dome or membrane layer. The silicone body is compression moulded at 50 ± 5 Shore A, then finished with an epoxy coated surface that resists abrasion, hand oil and repeated cleaning.
Every keypad is produced from a customer approved 2D or 3D drawing, with tooling built in house. Printing, laser etching, carbon pill placement, epoxy coating and final electrical test all run under one roof, so the contact resistance and actuation feel stay consistent from the first sample to the ten-thousandth piece.
Application Scenarios
The carbon pill construction suits control panels that need frequent, tactile input in environments where dust, moisture, oil mist or cleaning chemicals are present.
Test and Measurement InstrumentsBench meters, data loggers, calibration panels and portable testers where keys must stay reliable against dust and workshop grime.
Industrial Control and InstrumentationMachine panels, meter fronts, test instruments and handheld terminals that need a reliable tactile feedback after tens of thousands of presses.
Communication and Intercom DevicesTwo-way radios, door intercoms, access control panels and dispatch consoles with backlit key legends.
Household and Small ApplianceRemote controls, air conditioner panels, water purifier and kitchen appliance keypads.
POS, Payment and Vending TerminalsNumeric keypads on payment terminals, ticketing machines and vending interfaces exposed to public daily use.
Security, Access and Automotive AftermarketAlarm keypads, elevator call boards, charging pile panels and aftermarket dashboard controllers.
Simple Parameter Table
| Parameter | Standard Specification |
|---|
| Layout | 4x4 matrix, 16 keys, fully customisable key count and shape |
| Material | Silicone rubber, RoHS compliant, optional NBR / EPDM on request |
| Hardness | 50 ± 5 Shore A (range 20 to 80 Shore A available) |
| Conductive Contact | Moulded carbon pill, 2.0 to 3.0 mm diameter |
| Contact Resistance | ≤ 100 Ohm typical, tested per key |
| Actuation Force | 180 to 260 gf, tuneable by webbing thickness |
| Key Travel | 0.8 to 1.5 mm |
| Life Cycle | 1,000,000 presses minimum |
| Surface Finish | Epoxy coating, matte or glossy; PU and colour oil also available |
| Legends | Screen printing, laser etching, or debossed / embossed icons |
| Backlight Option | Translucent silicone with LED window, single or multi colour |
| Operating Temperature | -40 °C to +200 °C |
| Size | Built to customer 2D / 3D drawing, no fixed size limit per key |
| Certification | ISO 9001, SGS, RoHS |
The table above is the standard build. Hardness, actuation force, contact resistance and backlight colour can all be adjusted to match your existing keypad sample or drawing, and confirmed on a pre-production sample before mass production.
Quality Assurance
Quality control is written into each production step rather than added at the end of the line.
| Stage | Control Measure |
|---|
| Raw material | Silicone compound checked batch by batch for hardness, tensile strength and RoHS compliance; material certificate filed with the order record. |
| Tooling and sample | First article sample measured against the approved 2D / 3D drawing, including key height, pitch and web thickness, and signed off before mass production. |
| Moulding | Compression moulding with fixed cure time, temperature and pressure curves; first piece inspection every shift. |
| Electrical test | 100% contact resistance check on every key of every panel; units exceeding 100 Ohm are rejected. |
| Visual and dimensional | AQL 1.0 sampling on appearance, legend alignment, colour match and flash; dimensional check on critical keys. |
| Reliability | Cycle life, high and low temperature ageing, and cleaning agent resistance tested on each new tool. |
Each shipment is accompanied by an inspection report covering hardness, contact resistance, dimensional results and packing count, so your incoming quality team can verify the lot without re-testing everything.
Packaging Standards
Keypads are delicate on the key face and static sensitive when carbon loaded, so the packing sequence protects both the surface and the electrical performance.
| Layer | Specification |
|---|
| Inner protection | Each keypad in an anti-static PE bag, laid flat with no folding of the key face |
| Interlayer | Soft foam or tissue separators between stacked panels to prevent legends rubbing |
| Inner carton | Rigid inner box, maximum 500 pcs, with desiccant pack |
| Outer carton | Five layer export grade corrugated carton, taped and strapped, carton mark printed to your instruction |
| Carton size | Standard 50 x 40 x 35 cm, gross weight under 18 kg for manual handling |
| Labelling | Model, quantity, lot number and production date on both inner and outer carton |
| Custom packing | Customer artwork, barcode, retailer labels and palletised shipping available on request |
After-Sales Service
Response Within 24 HoursEvery technical question or claim is answered by a named engineer within one working day, in English.
Free SamplesStock samples are free, you cover freight only. Custom samples ship 7 to 10 days after drawing approval.
Tooling WarrantyTooling is maintained and stored free of charge for the life of the project, with free repair of normal wear.
Quality GuaranteeAny lot failing the agreed drawing or inspection standard is replaced or refunded, including freight when the fault is ours.
Order TrackingPhoto and video progress reports at moulding, printing, electrical test and packing stages.
Engineer SupportDFM feedback on your drawing before tooling: draft angle, key web, carbon pill placement and backlight routing.
Factory Scale
The plant runs silicone compression moulding in house, so tooling, moulding, printing, coating and testing are not subcontracted and lead times stay under our own control.
| Item | Capacity and Facility |
|---|
| Production area | 12,000 m² dedicated silicone moulding workshop |
| Presses | 60+ compression and injection moulding machines, 50 to 300 ton |
| Monthly capacity | 500,000 pcs of keypads and silicone parts per month |
| Tooling shop | In house CNC, EDM and engraving, new tool in 7 to 12 days |
| Workforce | 180+ staff, including 12 QC inspectors and 6 engineers |
| Experience | 15+ years in silicone rubber keypads and custom moulded parts |
| Export markets | Europe, North America, Japan, Southeast Asia and Australia |
FAQ
Q: Are you a manufacturer or a trading company?We are a manufacturer with our own moulding workshop and tooling shop, plus an overseas sales team that handles documentation and export for you.
Q: What is your MOQ?2,000 pcs per model for a standard keypad. For a brand new tool the MOQ can be adjusted, please send your drawing and annual volume so we can quote accordingly.
Q: Can I get samples before ordering?Yes. Stock samples are free of charge and you pay the freight. For a custom design, we provide 5 free pcs after the tooling cost is settled, usually in 7 to 10 days.
Q: What drawing format do you need?2D drawing in PDF, DWG or DXF with key layout and dimensions, or a 3D STEP file. A physical sample of your current keypad also works, we will reverse engineer it and send a drawing for approval.
Q: What is the production lead time?Custom sample 7 to 10 days. Mass production 15 to 20 working days after sample approval, or 7 to 15 working days for repeat orders with existing tooling.
Q: How do you handle a quality problem?Send photos and the quantity affected. Within 24 hours we give a root cause and corrective action. Confirmed defects are replaced in the next shipment or credited, and we cover the return freight when the fault is on our side.
Q: Which payment terms do you accept?T/T, L/C at sight, Western Union and PayPal. 30% deposit with the balance against the copy of the bill of lading for regular orders.
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