Anti-fog

Anti-fog is an additive or coating that prevents condensation from forming visible droplets on the inside of clear packaging film. Instead of fogging, moisture spreads into a thin transparent layer and the product stays visible.

Why fogging happens

When moist products such as salads, fresh meat, cheese or ready meals are chilled, water condenses on the cold film. Because plastics have low surface energy, it beads into tiny droplets that scatter light and make the pack look cloudy.

How anti-fog works

Anti-fog can be compounded into PE, CPP or BOPP films, where it migrates to the surface over time, or applied as a coating, which is common on PET. It must be on the side facing the product. Some systems are designed for chilled conditions, others for hot-packed products such as bread.

Points to watch

Because additives migrate to the surface, they can affect heat sealing, print adhesion and lamination bonds, and their effect can fade with long storage. Anti-fog additives must also meet food contact requirements. If your product is moist, chilled and sold on visual appeal, include anti-fog in your request and test it with real product in a fridge.