Cling film has a moderate oxygen permeability and impermeability, as a way to regulate the oxygen content and moisture content around the food being preserved, due to the internal and external oxygen can be exchanged, so it can effectively prevent anaerobic bacteria reproduction, and to block the dust in the air, thus extending the freshness of food. So the preservation of freshness includes 'water preservation', 'preservation of quality' and 'protection of nutrients', in general, the correct use of plastic wrap food can be preserved at room temperature to about a week!
According to the use of classification, the market is divided into two categories of cling film, one is the ordinary cling film, suitable for refrigerator freshness; a microwave oven cling film, can be used for both refrigerator freshness, can also be used for microwave ovens. The latter type of cling film is far superior to ordinary cling film in terms of heat resistance and non-toxicity. Therefore, consumers should pay special attention to the selection of cling film and itemize its use. In daily life, we can have many alternatives can replace the cling film, such as paper products, ceramic or glass containers, etc., use if the vessel covered with cling film, do not fill so as not to touch the food, to prevent the cling film on the food!
