A polyethylene bag is a food-grade plastic bag used as an inner liner within outer cartons or as standalone primary packaging for frozen fruit, vegetables and other bulk food products, providing a moisture barrier and protecting product integrity during storage and transport.
In trade practice
Polyethylene liners inside frozen product cartons are a standard format; thickness is specified to ensure the bag withstands low-temperature handling without cracking or splitting. Suppliers must provide a declaration of compliance confirming the film meets food-contact requirements under applicable EU rules. A common error is using bags that comply with general plastic regulations but lack documentation specific to low-temperature or frozen-food use. Intake checks include visual inspection for seal integrity and confirmation that bag specification matches the approved supplier documentation.
In a specification
Specifications state film thickness, seal type, food-contact compliance reference and low-temperature performance requirement, along with any print or identification markings required on the bag.