In daily life, people are exposed to more plastic bags (films), general polyvinyl chloride (PVC) and polyethylene (PE) plastic films (bags), how to distinguish between the two, Shijiazhuang Zeyi Packaging is summarized below Several simple methods:
⑴ touch method
It feels lubricious to the touch, and the surface looks like a layer of wax (chemically called wax feel). This is a non-toxic polyethylene film bag, while the PVC film feels a little sticky.
When shaking hands, the sound is crisp, 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
It is flammable in case of fire, the flame is yellow, and there is paraffin-like oil dripping when burning, and there is gas from candle burning. It is a non-toxic polyethylene film bag. If it is not easy to burn, it will be extinguished when it is away from the fire, and the flame will be green and it is a polyvinyl chloride film bag.
⑷ immersion method
The plastic bag is immersed in water and pressed 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 that of water, and the density of polyvinyl chloride is greater than that of water; at room temperature, they are 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.