EVOH
Also known as: EVOH, ethylene vinyl alcohol, EVOH barrier layer, EVOH coextruded film
EVOH is a clear plastic barrier layer buried inside multilayer films, keeping oxygen and aroma transmission very low.
EVOH (ethylene vinyl alcohol copolymer) is one of the best oxygen and aroma barriers among plastics. In flexible packaging it is used as a very thin layer, a few microns, coextruded between PE or PP layers.
What it does
EVOH keeps oxygen out, sharply lowering OTR and extending the shelf life of cheese, cured meat, ready meals, sauces and fatty foods. It also holds aromas in and keeps outside odours away. Its big advantage is clarity: you get high barrier while still showing the product.
Moisture sensitivity
EVOH loses much of its oxygen barrier when it absorbs water, so it is always sandwiched between moisture-resistant PE or PP layers. For retort or very humid applications, barrier after processing should be tested.
Recyclability
At low proportions, EVOH generally does not prevent PE- or PP-based packs from being recycled, which is why it often replaces foil in high-barrier mono-material pouches. Accepted limits vary between design guidelines, so check the structure against the relevant guidance before making claims. Note that EVOH does not block light; light-sensitive products may need an opaque layer.
Frequently asked
Can EVOH replace aluminium foil?
For oxygen barrier it often can, with the bonus of clarity. It does not block light and is moisture-sensitive, so foil may still be safer for very long shelf life.
Does EVOH stop a pouch from being recyclable?
Used in small amounts within a PE or PP structure, it is generally considered compatible with recycling, but check the specific design guidelines.
Related terms
Let's choose your packaging together
Work out the price for your size now, or ask our team which structure suits your product.