The barrier performance of metalized films comes from the combination of the polymer substrate and the ultra-thin aluminum layer. Together, they create a multi-layer shield that protects products from moisture, oxygen, light and aroma transfer.
Moisture Barrier
Metalized PET films achieve moisture vapor transmission rates (MVTR) below 0.5 g/m²/day — orders of magnitude better than uncoated polymer films. This is critical for snacks, pharmaceuticals and other moisture-sensitive products.
Oxygen Barrier
The aluminum layer blocks oxygen transmission to less than 1 cc/m²/day. This extends shelf life and preserves flavor, color and nutritional value.
Light Barrier
The reflective metal layer blocks visible and UV light, protecting light-sensitive products like vitamins, beverages and dairy.
For most barrier applications, metalized PET delivers the best balance of protection, cost and processability.