Puncture resistance

Puncture resistance is a packaging film's ability to withstand sharp, hard or angular objects without being pierced, whether from the product inside or from impacts during handling.

Where it matters

• Bone-in meat and seafood, especially in vacuum pouches
• Hard, angular dry goods such as pasta, rice, nuts in shell, cat litter and rock salt
• Frozen foods, which are hard and make some films more brittle
• Large, heavy packs exposed to knocks in transit

Materials that help

OPA (nylon) is the classic choice because it is tough and flexible. LLDPE and metallocene PE sealants also improve toughness. Structures such as PET/OPA/PE are common for demanding products. Aluminium foil alone punctures easily and is often protected by an OPA layer.

Testing

Labs measure the force to push a probe through the film and use dart drop tests for impact. Real filling, transport and drop trials remain the best check. Even tiny pinholes can destroy barrier and cause vacuum loss. Simply adding thickness is often less effective than choosing the right material, so tell your converter about bones, shells or sharp edges and send product samples where possible.