plastic wrap

Plastic wrap, also known as cling film or Saran wrap, is a thin, flexible plastic film derived from petroleum-based polymers such as polyvinylidene chloride (PVDC), low-density polyethylene (LDPE), or polyvinyl chloride (PVC). Developed in the mid-20th century, plastic wrap clings to food and surfaces through weak Van der Waals forces rather than adhesive, creating an airtight or semi-airtight seal without leaving residue.

The most common formulations use LDPE or PVDC, each with distinct properties: PVDC variants provide superior oxygen and moisture barriers, while LDPE options offer greater stretchability and ease of handling. Modern variants are increasingly marketed as PVC-free due to health and environmental concerns.

Plastic wrap is a kitchen staple used primarily to preserve prepared foods, prevent oxidation, and maintain moisture during storage and marinating. It covers bowls of dough during fermentation, wraps individual portions for freezing, and lines baking pans to prevent sticking. In professional and home kitchens, it is also used to tightly encase proteins or vegetables before sous vide cooking or to create an airtight seal on containers lacking lids. While not intended for direct food contact during heating, some applications involve covering food during microwave cooking, though this requires careful handling to prevent melting or chemical leaching at high temperatures.