How to distinguish PVC and PE plastic film (bag) in daily life

1. Touch method
It feels lubricating when you touch it with your hand. The surface looks like a layer of wax (chemically called wax feeling). This is a non-toxic polyethylene film bag, while the PVC film feels sticky.
2. Dithering method
When shaking by hand, the sound is crisp, and the polyethylene film bag is easy to float. And the PVC film bag with low voice when shaking by hand.
3. Combustion method
Flammable in case of fire, the flame is yellow, there is paraffin oil dripping when burning, and there is gas when burning candles. It is a non-toxic polyethylene film bag. If it is not easy to burn, it will be extinguished immediately after leaving the fire. The flame is green and it is a PVC film bag.
4. Immersion method
Dip the plastic bag into the water, press it into the water with your hand, and polyethylene will emerge from the water surface, while polyvinyl chloride will sink into the water bottom (the density of polyethylene is less than that of water, while the density of polyvinyl chloride is greater than that of water; at room temperature, it is about 0.92g/cm3 and 1.4g/cm3 respectively).
A copper wire can also be taken and burned red in the fire. Then, contact the copper wire with the plastic film for test to produce chemical changes, and put the copper wire dipped with the plastic composition back into the flame. At this time, careful observation is required. If there are colorful and dazzling green flames, it means that this plastic material contains chlorine, which belongs to PVC.