Optical Base PET Film

Optical base pet film is a low haze, high light transmission polyester substrate made for OCA coating, hard coating, ITO coating, optical lamination, and display material converting. Protective Film Factory is an optical base pet film manufacturer producing optical grade PET film with typical light transmission >=90%, haze controlled to <=1.5%, stable thickness uniformity, and clean roll appearance. This coating-ready PET base helps reduce particles, curl, black spots, and uneven coating in finished display materials.

Product Overview

This film is not selected only because it looks clear. In optical converting, a small mark that is almost invisible on the roll may become obvious after adhesive coating, hard coat curing, ITO sputtering, or pressure lamination. Before running a full roll, production teams usually review haze, light transmission, surface smoothness, gels, particles, crystal spots, fish-eye defects, edge wave, curl, and coating-side consistency.

For OCA carrier use and optical adhesive lamination, the PET surface needs to stay clean and flat so bubbles, trapped particles, edge haze, residue, and delamination are easier to control. For hard coating and ITO coating, coating wet-out, adhesion after curing, surface roughness, and thickness variation across the roll width are often more important than ordinary transparency.

Protective Film Factory supplies this low haze PET film with controlled winding tension, clean slitting edges, and roll flatness for coating and lamination trials. Smooth untreated, corona-treated, and primer-treated options are available. Before volume use, sample rolls should be tested with the actual formula, curing temperature, adhesive layer, and lamination pressure, then checked after 24-72 hours for bubble, curl, edge haze, residue, or adhesion change.

Benefits

Low haze for display clarity:Typical haze can be controlled at <=1.5%, helping reduce light scattering after processing.
High light transmission:Typical light transmission is >=90%, supporting clean and bright display performance.
Smooth coating base:A controlled surface helps reduce streaks, pinholes, voids, weak anchoring, and lamination marks.
Stable coating adhesion:Primer-treated options improve bonding for hard coating, adhesive coating, and functional optical layers.
OCA process suitability:PET base film for OCA needs clean appearance, flat winding, and stable coating behavior.
ITO coating readiness:Surface uniformity supports ITO coating PET film conversion where particles may affect transparency and conductivity.
Controlled roll quality:Typical roll width tolerance can be +/-1 mm after precision slitting.

How does surface smoothness affect coating adhesion in OCA, hard coating, and ITO processes?

Surface smoothness is one key difference between optical base pet film and general clear PET film. In OCA coating, hard coating, and ITO coating, uneven roughness may lead to coating streaks, weak anchoring, pinholes, optical distortion, or visible marks after lamination. A smoother surface allows liquid coating to spread evenly and improves bonding after curing. For display modules or transparent conductive layers, treated-side identification, surface energy, and adhesion after curing should be confirmed during trial coating.

TDS

Item	Typical Value
Product Type	Optical grade PET base film
Base Material	Biaxially oriented PET film
Thickness Range	23um-250um, custom thickness available
Thickness Tolerance	Typical +/-2%, tighter control by grade
Light Transmission	>=90%, ASTM D1003 or equivalent optical test method
Haze	<=1.5%, ASTM D1003 or equivalent method, lower haze grade available
Surface Treatment	Untreated, corona-treated, or primer-treated side option
Coating Adhesion	Suitable for hard coating, OCA coating, ITO coating, and adhesive coating trials
Cleanliness Control	Low black spot, gel, particle, crystal spot, and fish-eye defect control
Roll Flatness	Reduced edge wave, curl, gauge band, and telescoping risk
Heat Shrinkage	Tested at 150 C / 30 min by grade
Roll Width Tolerance	Typical +/-1 mm after precision slitting
Aging Observation	85 C / 85%RH sample observation available when required
Sample Validation	Coating and lamination trial recommended before mass production

Applications

OCA coating and optical adhesive lamination
Hard coating PET substrate for display cover films
ITO coating PET film conversion for transparent conductive layers
Touch panel and display module lamination
Polarizer protection and functional optical film processing
Clean-room coating, curing, slitting, and display material converting

What should be tested before coating or laminating optical base PET film?

Before mass production, optical base pet film should be tested with the real coating formula, curing condition, adhesive layer, and lamination structure. Key checks include haze, light transmission, coating adhesion, treated-side identification, cleanliness, thickness uniformity, roll flatness, and curl after heating. For OCA stacks, bubbles, edge haze, delamination, and residue should be observed after 24-72 hours. For stricter display projects, 85 C / 85%RH aging observation can confirm whether defects become visible after heat and humidity exposure.

Production Line

Loading Details

FAQ

Q1: Is this film used like general clear PET film?

No. It is made for OCA coating, hard coating, ITO coating, optical lamination, and display material converting.

Q2: Can the film be supplied with primer treatment?

Yes. Primer-treated options are available for better coating adhesion.

Q3: What optical values can be checked?

Light transmission, haze, surface appearance, and coating-side performance can be tested.

Q4: Should samples be tested before mass production?

Yes. Real coating or lamination trials are recommended before volume use.