1. When heating oily food, keep the fresh-keeping film and the food in an isolated state, and avoid direct contact between the two. When the food is heated, the food oil may reach a very high temperature, causing the fresh-keeping film to break and stick to the food.
2. When heating food, the utensils shall be covered with fresh-keeping film, and then several small holes shall be punched on the fresh-keeping film with toothpicks and other needles to facilitate evaporation of water and prevent bursting of the fresh-keeping film due to gas expansion.
3. The maximum heat-resistant temperature marked on the fresh-keeping films of different brands is different, some of which differ by about 10 ℃. When the temperature in the microwave oven is high, it will generally reach about 110 ℃. When it needs to be heated for a long time, you can pay attention to selecting the fresh-keeping film with high heat resistance.