Ordinary fresh-keeping bags are mostly made of PVC. When the temperature exceeds 50℃, the toxic components in the plastic bag will seep out. When the temperature reaches 80℃, it will decompose and release toxic substances when heated, while the PE fresh-keeping bag is basically non-toxic and can be heated by microwave oven.

Commonly used food plastic bags are mostly polyethylene films, which are non-toxic and can be used to hold food. There is also a membrane made of PVC, which is not toxic in itself, but the additives added according to the purpose of the membrane are often harmful to the human body and have certain toxicity. Therefore, this film and plastic bags made of this film are not suitable for holding food.