Recently it is seen that many catering agency are using food grade stretch film of 18 micron for covering the food bowls during the outdoor catering. They cover the bowl after filling the food within and then wrap food grade stretch film on them which helps them to avoid dust and insects and other foreign body to get in the food. It is also good to keep food hot. Stretch Films produced from 100% food grade are good for such applications. The breathability of the film is almost zero so it keeps food and fruits fresh. Also seen that as it's food grade so it's totally harmless to eat food which is packed in it.