What is leave film on tray?

Leaving film on tray refers to the practice of not removing the plastic film cover from a microwave-safe tray or dish before heating food in the microwave. The plastic film retains moisture and prevents food from splattering, making it convenient for consumers to use. However, some types of microwave-safe plastic wrap may contain chemicals that can leach into the food when heated. Consumers should always read the instructions on the plastic wrap packaging before using it in the microwave. To be safe, it is best to remove the film cover before heating food in the microwave. It's also worth noting that leaving the film on the tray could cause it to melt or warp in some cases, which can make it unsafe for reuse.