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. If you want to identify PVC plastic bags and polyethylene plastic bags, you can use the following simple methods to identify them.
Polyethylene film (nontoxic)
The film is milky white, translucent (especially obvious after being folded several times), smooth to the touch, as if the surface is coated with a layer of wax, which is hard to shake, brittle in sound, flammable in case of fire, yellow in flame, dripping with mucus when burning, and smelling of candles when burning.
PVC film (usually toxic)
If no pigment is added, it is transparent, the surface feels a little sticky, shaking badly and the sound is low. It is not easy to burn in case of fire, and it goes out immediately after leaving the flame, and the flame is green.