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OPA (nylon / polyamide)
Also known as: OPA, BOPA, nylon film, polyamide film, PA film, oriented polyamide, oriented nylon
OPA is oriented polyamide (nylon) film, prized for puncture and impact resistance plus a good oxygen barrier in vacuum and retort pouches.
OPA (oriented polyamide), also called BOPA when biaxially oriented, is nylon film. In flexible packaging it stands out for puncture, impact and flex resistance and offers a good oxygen barrier.
What it does
OPA adds toughness to a laminate. Bone-in meat, sharp nuts, dry pasta, coffee beans and frozen food all push against the film from inside; OPA greatly reduces punctures and bursts. It also limits flex cracking, which helps protect foil layers.
Common structures
- OPA/PE for vacuum pouches for meat and cheese
- PET/AL/OPA/CPP for retort pouches
- PET/OPA/PE for heavy or sharp dry goods
Watch-outs
Polyamide absorbs moisture; when humid its oxygen barrier falls and it can change dimension, so it is always paired with PE or PP for moisture protection. It costs more than PE or PP and creates a mixed-material laminate that is harder to recycle, so add it only when the product really needs the puncture resistance. A typical gauge is around 15 microns.
Frequently asked
Is OPA the same as nylon?
Yes. OPA is oriented polyamide, which is the chemical family commonly known as nylon.
Why is OPA used in vacuum bags?
Its puncture resistance stops bones or hard edges from piercing the bag under vacuum, and its oxygen barrier helps preserve the product.
Related terms
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