Board and carbon construction
Confirm FR-4 grade and thickness, copper build, finish, carbon system, print coverage, cure, exposed windows, solder-mask relationship, and any additional protective layer.
Printed carbon contact interface
Carbon Contact PCB
Carbon contact PCBs add printed polymer-carbon areas to an FR-4 circuit where a keypad, spring, brush, or moving contact needs a drawing-defined interface. Chipsimple reviews carbon coverage, copper overlap, surface finish, contact geometry, force, current, contamination, wear duty, protection, and inspection as one system.
- Drawing-defined carbon contact zones
- Copper-to-carbon overlap control
- Mating contact and force reviewed
- Wear and contamination tests by duty
FR-4Base material
8–15 µmCarbon film typical
5Verified product views
By interfaceWear release basis
On this pageOverview
Quick Specifications
These FR-4 carbon-film values are category selection references. Board stack, copper, finish, carbon ink, film build, contact resistance, force, current, wear target, protection, and acceptance method are confirmed for the actual mating interface and operating environment.
Final values confirmed against customer drawing.
| Base Material | FR-4 |
|---|---|
| Board Thickness | 0.4–3.2 mm typical |
| Copper Weight | 0.5–2 oz typical |
| Carbon Ink | Polymer carbon / Ag-C blend |
| Carbon Film Thickness | 8–15 µm typical |
| Cure Temperature | 120–150°C typical |
| Sheet Resistance | 50–5,000 Ω/□/25 µm reference |
|---|---|
| Target Resistance | 10 Ω–1 MΩ typical |
| Resistance Tolerance | ±5% / ±10% typical |
| Linearity | ±1–5% FS typical |
| Surface Finish | HASL / ENIG / ENEPIG |
| Wear Life | ≥10,000 cycles typical |
Engineering Capabilities
Stable contact performance requires coordinated review of board fabrication and mechanics. The released design connects carbon artwork, copper overlap, surface finish, exposed windows, mating contact material, force, motion, electrical loading, contamination, cleaning, wear duty, and the measurement method used at incoming and functional inspection.
Contact-zone artwork
Release contact sectors, fingers, rings, overlaps, clearances, center features, indexing, and mating alignment in controlled Gerber or drawing data with functional dimensions.
Mating contact mechanics
Specify keypad pill, spring, brush, or wiper material, geometry, force, travel, speed, current, direction, lubrication, contamination, and cleaning conditions.
Contact and wear validation
Select visual, dimensional, contact resistance, voltage drop, continuity, adhesion, abrasion, cycling, environment, and functional tests with controlled fixtures and limits.
Typical Applications
Printed carbon contacts suit compact switching and sensing interfaces when the mating part, load, environment, and expected movement duty are defined with the board.
Application illustrationIndustrial control interfaces
Carbon contact zones may support compact switches or feedback modules after contact force, current, enclosure, contamination, cleaning, and lifecycle requirements are defined.
Review application inputs
Application illustrationAppliance controls
Low-profile appliance controls can use printed contact interfaces when keypad mechanics, moisture, cleaning agents, current, tactile behavior, and cycle targets are validated.
Review application inputs
Application illustrationAutomotive switches and sensors
Vehicle modules require application-specific vibration, temperature, humidity, contamination, electrical loading, contact wear, connector, and end-of-line acceptance review.
Review application inputsVerified Product Views
The verified photographs show FR-4 boards with exposed conductor patterns, black printed contact regions, circular openings, terminal areas, and several artwork variants. Surface appearance does not prove the carbon formulation, film thickness, surface finish, contact resistance, current capacity, adhesion, or wear life.
- Visible interface
- Black contact sectors, conductor areas, board outlines, holes, and pad layouts are visible.
- Finish boundary
- Metal appearance alone does not identify copper finish, thickness, solderability, or contact performance.
- Electrical boundary
- Contact resistance, voltage drop, current, and switching behavior require a defined mating contact and test method.
- Wear boundary
- Cycle life is released only with contact material, force, travel, environment, and acceptance limits.
Manufacturing & Quality
Chipsimple supports polymer-carbon printing, laboratory inspection, managed production, and protected packing in Dongguan. Carbon contact projects control the board revision, carbon artwork, cure route, contact fixture, test current, sampling, traceability, and acceptance criteria; application wear remains subject to the released mating system and validation plan.
View Full Capabilities
Technical FAQ
Short answers for quotation planning; released drawings and validation requirements remain controlling.
What should be defined first for a custom Carbon Contact PCB?
Start with the FR-4 stack, copper finish, carbon artwork and windows, mating contact material and geometry, force, travel or switching motion, electrical current and voltage, contamination and cleaning, expected cycles, environment, housing alignment, and the contact-resistance or functional acceptance method.
Are the quick specification values guaranteed for every design?
No. They are practical category-level selection values, not a released product specification. Material compatibility, geometry, print build, electrical loading, assembly, environment, inspection method, and expected volume can narrow the usable window. Final values are confirmed against the controlled drawing and approved project conditions.
How should Carbon Contact PCB performance be validated?
Validate board dimensions and alignment, carbon coverage and adhesion, contact resistance or voltage drop under the real force and current, functional switching, abrasion or cycling, temperature, humidity, contamination, and cleaning exposure. Fixtures, contact parts, conditioning, sample size, and failure limits must match the intended assembly.
What should be included with an RFQ?
Send the controlled drawing or artwork, dimensions and tolerances, material preference, electrical targets, assembly interface, operating environment, validation requirements, prototype quantity, annual volume, and schedule. Include the mating contact drawing, force, motion, electrical load, contamination, cleaning, and target cycles.
Request a Carbon Contact PCB Quote
Send board data and the mating contact conditions together. Carbon coverage, finish, force, motion, electrical loading, contamination, wear duty, and the test fixture determine whether a contact design can be quoted and validated without relying on unsupported assumptions.
- Drawing-led DFM and material-route feedback
- Prototype and repeat-production route review
- Confidential handling of customer files
- Project-specific inspection and validation planning
- Gerber, drill, stack-up, outline, and controlled drawing
- FR-4 thickness, copper weight, finish, and mask openings
- Carbon artwork, ink requirement, overlaps, and cure limits
- Mating contact material, geometry, force, and alignment
- Current, voltage, contact resistance, and test method
- Motion, cycle target, contamination, cleaning, and environment
- Quantity, schedule, sampling, traceability, and packing
- 1We review the drawing, application, material route, and missing acceptance inputs.
- 2You receive DFM questions and a prototype route for approval.
- 3Repeat production follows the released revision, inspection plan, and packing requirement.
Submit RFQ and upload files
PDF, DWG, DXF, STEP, Gerber, ZIP, Excel, Word, or sample photos are accepted.