High Light Transmission BOPET Film — ≥88% Metallization Grade
Metallized polyester looks expensive when the base film is right and looks cheap when it is not. This 8 micron BOPET film is engineered for metallizing, with light transmission ≥88% and a smooth, defect-free surface that lets the aluminium deposit form a bright, uniform mirror layer at a lower coating weight.
Problem
Converters producing VMPET (metallized polyester) frequently see a dull, greyish appearance, pinholes, and uneven opacity across the web. The metallized layer grips inconsistently, so downstream ink or adhesive adhesion fails. To compensate, operators increase aluminium loading, which raises cost and can make the film brittle in the vacuum chamber.
Cause
The brightness of a metallized layer depends on the base film's surface smoothness and internal light transmission. Surface irregularities scatter the incoming aluminium vapour, producing a matte rather than bright finish and weakening adhesion. thin-gauge internal scattering from residual crystallites further reduces transmission, so less light passes and the film looks darker. Contamination or slip additive bloom on the surface creates nucleation defects that show as pinholes.
Solution
This film pairs a clean, low-additive core with a tightly controlled surface roughness in the 0.02-0.04 μm range, giving a consistent substrate for aluminium nucleation. Light transmission is held at ≥88%, so a thin, even coating reads bright. A controlled skin formulation keeps slip additives away from the metallizing surface, which improves aluminium adhesion to ≥2.0 N/15mm while maintaining windability.
Application
Suited to metallized flexible packaging for snacks, confectionery and coffee, decorative and barrier films, and as a lamination web where a metallic look and moisture barrier are both required. Its uniformity also supports optical and reflective film applications.
Selection Guide
when you need maximum yield and a bright metallized appearance. If the metallized film must survive aggressive downstream handling or high barrier is critical, consider 12 μm base for more robustness, or add a top coat to protect the aluminium layer.
FAQ
Q: What optical density can be expected after metallizing?
A: With standard aluminium loading the film reaches OD 2.0-2.5; exact values depend on the metallizer and are confirmed on trial.
Q: Does the film need a primer for metallizing?
A: No primer is required; the surface is formulated for direct aluminium deposition, though a primer can further raise adhesion if needed.
Q: Is it food-contact compliant?
A: Yes, FDA and EU compliant, and suitable as the food-side layer of a metallized laminate.
Q: What width range is available?
A: Slit widths from 350 mm up to 2800 mm, with 3 inch or 6 inch cores.
Send us your target optical density and we will supply a metallizing trial roll with matching surface data.
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