How to distinguish between PVC plastic bags and PE plastic bags?

In daily life, people are exposed to many plastic bags (films), such as polyvinyl chloride (PVC) and polyethylene (PE) plastic films (bags). How to distinguish between the two? The following summarizes a few A simple method: ⑴ The touch method feels lubricious to the touch by hand, and the surface is like a layer of wax (chemically called wax feel). This is a non-toxic polyethylene film bag, while the PVC film feels a little awkward to the touch. stick. ⑵ Shake method: Shake by hand, the sound is brittle, and the thing that floats easily is a polyethylene film bag. And the low sound of shaking with hands is a polyvinyl chloride film bag. ⑶ Combustion method is flammable in fire, the flame is yellow, there are paraffin-like oil drops when burning, and there is gas when the candle burns. It is a non-toxic polyethylene film bag. If it is not easy to burn, it will be extinguished after leaving the fire. The flame is green and it is a polyvinyl chloride film bag. ⑷Immerse the plastic bag in water, press it into the water by hand, the one that can surface is polyethylene, and the one that sinks to the bottom is polyvinyl chloride (the density of polyethylene is less than water, and the density of polyvinyl chloride is greater than water; at room temperature Respectively about 0.92g/cm3 and 1.4g/cm3). In addition, you can also take a piece of copper wire and burn it in the fire to make it red. Then, the copper wire is brought into contact with the test plastic film to cause a chemical change, and then the copper wire dipped in the plastic component is put back into the flame. At this time, you need to observe carefully. If there is a colorful, dazzling green flame, it means that this plastic material contains chlorine and belongs to the polyvinyl chloride material.