Optical Clear Adhesive Film

PET Film Supply Company manufactures Optical Clear Adhesive Film for permanent bonding inside LCD, OLED, touch-panel, and cover-lens assemblies. This carrierless OCA optical bonding adhesive provides high light transmission, low haze, smooth wet-out, and reliable adhesion to glass, treated PET, PMMA, and PC. Each grade is matched to the display structure, printed-border design, plastic outgassing, liner release, lamination process, and required environmental reliability.

Product Overview

Optical Clear Adhesive Film is an acrylic pressure-sensitive transfer adhesive supplied between easy-release and tight-release PET liners. Both liners are removed during assembly, leaving only the transparent adhesive between the optical components. PET acts as the release liner or as a bonded optical substrate; it is not a permanent carrier inside the adhesive layer.

Adhesive thicknesses commonly range from 25 to 250 um. Thin grades suit flat glass, optical PET, and film-sensor structures. Thicker or more conformable grades can improve wet-out around decorative ink borders. However, extra thickness may also increase edge flow, component movement, die-cut deformation, or liner-removal difficulty. Optical values should therefore be checked on the intended laminated stack, not on adhesive thickness alone.

Benefits

• High transmittance and low haze help preserve brightness, contrast, image definition, and natural color.
• Carrierless construction avoids adding a permanent supporting film to the optical path.
• Controlled wet-out helps fill printed borders and reduce localized air pockets.
• Adhesion can be matched to glass, coated PET, ITO PET, PMMA, and PC.
• Bubble-control grades reduce trapped air, edge voids, blistering, and delayed bubbles.
• Differential liners support clean handling, accurate placement, stable die cutting, and controlled peeling.
• Balanced release helps limit adhesive stretching during automated lamination.

What Should Be Verified Before OCA Is Approved for PC or PMMA Cover-Lens Bonding?

PC and PMMA cannot be approved from an initial peel result alone. Plastic parts may retain moisture, molding residue, internal stress, or volatile substances that are released during heating. A laminate can appear clear after production and still develop bubbles later.

Testing should use the actual plastic grade, surface coating, printed border, adhesive thickness, and complete display construction. Inspect the assembly after lamination, after the agreed heat or humidity exposure, and again after room-temperature recovery. Where relevant, 85 C/85% RH can be used as a project test condition. Record delayed bubbles, whitening, edge lifting, distortion, overflow, and layer separation.

TDS / Technical Data Sheet

Production Line

How Should OCA Thickness Be Matched to Ink Steps and Display-Stack Geometry?

The nominal air gap is only one part of thickness selection. Printed-border height, cover-lens flatness, substrate stiffness, lamination pressure, and vacuum level all influence adhesive flow.

Flat glass or optical PET may use a thinner grade. A printed lens may require additional thickness or a softer adhesive to fill the ink step. The OCA must wet the border without leaving an air line, shifting alignment, causing distortion, or flowing beyond the finished edge. Production trials should also review die-cut stability, liner removal, edge cleanliness, transmittance, haze, overflow, and delayed bubbles at the intended thickness. Peel strength alone cannot confirm long-term optical stability.

Applications

• Cover glass to touch-sensor assembly
• Touch-panel lamination to LCD or OLED modules
• PMMA and PC cover-lens bonding after outgassing evaluation
• Optical PET and ITO PET film lamination
• Automotive center displays and instrument clusters
• Industrial HMI and medical display modules
• Rigid and flexible display-stack assembly

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FAQ

Is Optical Clear Adhesive Film suitable for both LCD and OLED assemblies?

Yes. The grade must match the display structure, operating temperature, flexibility, moisture sensitivity, and optical requirements.

Can the same OCA grade be used on glass, PET, PMMA, and PC?

Not automatically. Surface coatings, moisture absorption, outgassing, adhesive thickness, and aging conditions can produce different results.

How is bubble resistance checked?

Inspect the complete laminated stack after bonding, after environmental aging, and again after room-temperature recovery.

Can the material be prepared for automated lamination and die cutting?

Yes. Roll width, winding direction, liner release balance, roll flatness, cutting quality, and peeling sequence can be matched to the process.