Frozen food packaging gets handled in conditions most other flexible packaging never experiences: deep-freeze storage, repeated temperature swings between freezer and retail, and high-velocity drops in distribution centers where product is moving fast and gets handled rough. Choosing film for this category means weighting properties differently than a typical ambient-temperature application would.
Low-temperature impact resistance is non-negotiable
Most polyethylene resins become more brittle as temperature drops, and a film that performs fine at room temperature can crack or shatter at freezer temperatures under the same impact. Dart impact strength has to be evaluated at or near the actual storage temperature, not just at the standard lab condition, because the ranking of resins can change once cold brittleness becomes the dominant factor.
Seal integrity through temperature cycling
Product moves between deep freeze, transit, and retail freezer cases multiple times before reaching a consumer, and each cycle creates condensation and minor expansion and contraction at the seal. A seal that looks intact when tested once can develop a slow leak path after several real-world temperature cycles, which is why seal integrity testing under cyclic conditions matters more here than for shelf-stable products.
Puncture resistance against irregular product shapes
Frozen vegetables, bone-in proteins, and irregularly shaped products create sharp internal pressure points against the film during freezing, when liquid inside expands. Film for these applications generally needs higher puncture resistance than the equivalent ambient-temperature package, because the product itself is working against the film from the inside.
Moisture barrier to prevent freezer burn
Freezer burn is a moisture migration problem, not a temperature problem by itself. A film with inadequate moisture barrier lets product moisture migrate out and sublime, leaving the dried, discolored surface texture consumers recognize as freezer burn. Polyethylene alone provides a reasonable moisture barrier for many frozen items, but products with longer expected freezer life often benefit from a structure with enhanced barrier performance.
Practical structure recommendations
A common starting point is a coextruded blown film built around LLDPE for toughness and seal performance, with additives selected for cold-temperature flexibility rather than standard ambient performance. Higher-value or longer-shelf-life frozen products may justify a barrier layer to manage moisture loss over extended freezer storage. The right answer depends on expected freezer dwell time, product shape, and how roughly the package gets handled in your specific distribution chain.