保鲜膜有适度的透氧性和透湿度,能调节食物的含氧量和含水量,阻隔空气中的灰尘,从而延长食品的保鲜期。但保鲜膜也有分类,微波炉用的与冰箱专用的就有不同。一类是普通保鲜膜,适用于冰箱保鲜;另一类是微波炉保鲜膜,既可以用于微波炉加热,又可以用于冰箱保 Cling film has a moderate oxygen permeability and moisture permeability, can regulate the oxygen content and water content of food, blocking the air of dust, thereby extending the shelf life of food. However, there are plastic wrap classification, microwave oven and refrigerator dedicated there is a difference. One is the ordinary cling film, suitable for refrigerator preservation; the other is the microwave cling film, both for microwave heating, but also can be used for refrigerator