INDUSTRY COMPONENT

Silkscreen

Silkscreen is a printed layer on PCBs that provides component placement guides, labels, logos, and other identification markings using ink.

Component Specifications

Definition
Silkscreen, also known as legend printing, is a non-conductive ink layer applied to the surface of printed circuit boards (PCBs) through screen printing or inkjet printing processes. It serves as a visual reference layer containing alphanumeric identifiers (reference designators like R1, C2), polarity indicators, component outlines, test points, company logos, part numbers, and assembly instructions. This layer is typically applied after solder mask application and helps technicians during manual assembly, inspection, testing, and troubleshooting by clearly marking component positions and orientations on the board.
Working Principle
Silkscreen application operates on printing principles where ink is transferred through a patterned screen (traditional screen printing) or deposited via precise nozzles (inkjet printing) onto the PCB surface. The ink is then cured through thermal or UV processes to create permanent, legible markings that withstand subsequent manufacturing steps and environmental conditions.
Materials
Epoxy-based inks (most common), liquid photoimageable (LPI) inks, or UV-curable inks. Materials must exhibit properties like adhesion to solder mask/surface finishes, chemical resistance, thermal stability (surviving reflow temperatures up to 260°C), and appropriate color contrast (typically white, yellow, or black).
Technical Parameters
  • Line Width 0.15mm minimum
  • Color Options White, Yellow, Black
  • Curing Method UV or Thermal
  • Ink Thickness 10-25 microns
  • Character Height 1.0mm minimum (0.8mm for high-density)
  • Adhesion Strength ≥3B per ASTM D3359
  • Thermal Resistance Withstands 260°C for 30 seconds
Standards
IPC-4781, IPC-6012, ISO 9001, IEC 61189-5

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Silkscreen.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Ink smearing during handling
  • Poor legibility due to resolution limits
  • Adhesion failure in humid environments
  • Misalignment causing assembly errors
  • Ink contamination of solderable surfaces
FMEA Triads
Trigger: Insufficient ink curing
Failure: Ink smudging or wiping off during handling
Mitigation: Implement proper curing parameter controls and adhesion testing
Trigger: Screen/printhead misalignment
Failure: Markings overlapping with solder pads or being unreadable
Mitigation: Use optical alignment systems and implement regular calibration procedures
Trigger: Ink viscosity variation
Failure: Inconsistent line definition and poor resolution
Mitigation: Maintain controlled ink storage conditions and implement viscosity monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1mm positional accuracy, ±0.05mm line width variation
Test Method
Visual inspection per IPC-A-610, adhesion tape test per ASTM D3359, thermal shock testing per IPC-TM-650

Buyer Feedback

★★★★☆ 4.6 / 5.0 (38 reviews)

"Found 48+ suppliers for Silkscreen on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Silkscreen is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Silkscreen so far."

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Frequently Asked Questions

What is the primary purpose of silkscreen on a PCB?

To provide visual guidance for component placement during assembly, identify components with reference designators, indicate polarity/orientation, and display logos/testing information.

Can silkscreen be applied over solder pads or vias?

No, silkscreen must avoid conductive areas like solder pads and vias to prevent interference with electrical connections and soldering processes.

What are common silkscreen color options and when are they used?

White is standard for most boards, yellow provides better contrast on dark solder masks, and black is used on light-colored substrates or for specific aesthetic requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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