This product is a printed circuit board with carbon ink (carbon oil) surface printing, designed to provide stable conductive contact areas, wear resistance, and reliable electrical performance. The carbon ink layer is typically used on key contact regions such as keypad contacts, jumper areas, or conductive pads, offering a cost-effective and durable alternative to metal surface finishes in specific applications.

Key Features

• Carbon ink printed surface (carbon oil): Provides stable and durable conductive contact points

• Excellent wear resistance: Suitable for repeated mechanical contact applications

• Stable electrical performance: Reliable conductivity for low-current signal transmission

• Cost-effective solution: Reduces the need for precious metal plating in contact areas

• Good chemical stability: Resistant to oxidation and environmental aging

• Compatible with multilayer PCB structures: Can be combined with FR-4 and other substrates

Technical Specifications

• Board type: FR-4 PCB with carbon ink printing

• Carbon ink thickness: 10–30 μm (typical, customizable)

• Surface application: Selective printing on contact pads or circuits

• Resistance value: Low resistance for signal/contact use (application dependent)

• Base material: FR-4 / high-Tg FR-4 (optional)

• Operating temperature: -40°C to 120°C (standard FR-4 range)

• Adhesion strength: High adhesion to solder mask and copper surfaces

Applications

• Membrane switches and keypad circuits

• Remote control devices

• Industrial control panels

• Household appliances (control buttons)

• Automotive interior electronics

• Low-power signal contact systems

• Flexible or rigid-flex contact designs

Advantages

Compared with metal plating solutions (gold or silver), carbon ink printing offers:

• Lower manufacturing cost for large-scale production

• Good wear resistance for repeated pressing contacts

• Stable performance in low-current applications

• Reduced dependence on precious metals

• Flexible design for selective contact areas

Customization Options

• Carbon ink printing area design (full / selective / pattern-based)

• Resistance control adjustment

• PCB material selection (FR-4, high-Tg, flexible options)

• Layer stack-up design (single-layer to multilayer integration)

• Solder mask color options

• Surface protection and finishing combinations

Quality Assurance

Each product is strictly tested to ensure consistent performance:

• Electrical resistance testing

• Adhesion strength testing

• Wear resistance (rub test)

• AOI (Automated Optical Inspection)

• Dimensional accuracy inspection

• Environmental aging testing