INDUSTRY COMPONENT

Optical Clear Adhesive (OCA)

Optical Clear Adhesive (OCA) is a transparent, pressure-sensitive adhesive used in touch sensor panels to bond layers without compromising optical clarity.

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Component Specifications

Definition
Optical Clear Adhesive (OCA) is a specialized adhesive film or liquid designed for bonding optical components in electronic displays, particularly touch sensor panels. It provides high transparency (>90% light transmission), uniform thickness, and excellent adhesion to glass, PET, and other substrates. OCA eliminates air gaps, reduces reflections, and enhances display brightness and touch sensitivity by maintaining optical integrity across bonded interfaces.
Working Principle
OCA works by creating a permanent, optically clear bond between layers (e.g., cover glass, touch sensor, display) through pressure-sensitive or liquid curing mechanisms. It fills micro-gaps, prevents Newton's rings, and minimizes light scattering by matching refractive indices of adjacent materials. The adhesive layer distributes stress evenly, improving mechanical durability and touch response.
Materials
Typically composed of acrylic or silicone-based polymers, with additives for UV stability, moisture resistance, and controlled viscosity. Common formulations include: acrylic pressure-sensitive adhesives (PSA), optically clear resins (OCR), and silicone gels. Thickness ranges from 25μm to 500μm, with hardness from soft (Shore OO 20) to rigid.
Technical Parameters
  • Haze <1%
  • Transmittance >90% (400-700nm)
  • Refractive Index 1.47-1.52
  • Adhesion Strength >500 gf/25mm
  • Dielectric Constant 2.5-3.5 @1kHz
  • Thickness Tolerance ±5μm
  • Operating Temperature -40°C to 85°C
Standards
ISO 13468-1, ISO 14782, ASTM D1003, JIS K7136

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Optical Clear Adhesive (OCA).

optical clear adhesive OCA touch sensor adhesive display bonding transparent adhesive optical adhesive film touch panel materials Optical Clear Adhesive (OCA) Optical Clear Adhesive (OCA) in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Touch Sensor Panel

The transparent panel component of a touchscreen that detects and locates touch input through various sensing technologies.

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Engineering Analysis

Risks & Mitigation
  • Bubbles or voids during lamination
  • Yellowing over time due to UV exposure
  • Adhesion failure in humid environments
  • Thickness variation affecting optical performance
FMEA Triads
Trigger: Contamination on substrate surfaces
Failure: Poor adhesion leading to delamination
Mitigation: Implement strict cleaning protocols (e.g., plasma treatment) and controlled environment during application.
Trigger: Incorrect thickness or curing parameters
Failure: Optical distortions or Newton's rings
Mitigation: Use precision laminators, monitor thickness with interferometry, and validate curing processes.
Trigger: Thermal expansion mismatch
Failure: Stress cracks in bonded layers
Mitigation: Select OCA with matched CTE to substrates and design for thermal cycling tolerance.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thickness: ±5μm; Adhesion: ±10% of spec; Optical properties: within 2% of reference values
Test Method
ASTM D1003 for haze/transmittance, peel adhesion tests per ASTM D3330, environmental testing per IEC 60068-2

Buyer Feedback

★★★★☆ 4.8 / 5.0 (38 reviews)

"Great transparency on the Optical Clear Adhesive (OCA) components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

"The Optical Clear Adhesive (OCA) we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

"Found 44+ suppliers for Optical Clear Adhesive (OCA) on CNFX, but this spec remains the most cost-effective."

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Frequently Asked Questions

What is the difference between OCA and LOCA?

OCA refers to pre-cut adhesive films applied with pressure, while LOCA (Liquid Optically Clear Adhesive) is a liquid resin dispensed and cured with UV light. OCA offers better thickness control, LOCA fills irregular gaps more effectively.

How does OCA affect touch sensor performance?

OCA improves touch sensitivity by reducing air gaps and reflections, ensuring consistent signal transmission. It also enhances durability by absorbing mechanical stress and preventing delamination.

Can OCA be removed or reworked?

OCA is designed for permanent bonding; removal typically damages components. Some formulations allow limited rework with heat or solvents, but replacement is often required.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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