Brief introduction of PVC square tendons and round tendons
In daily life, people often come into contact with PVC and PE plastic film (bags). Here are some easy ways to distinguish them:
It feels lubricated by hand, and the surface is coated with a layer of wax (chemically called waxy), which is a non-toxic polyethylene film bag, while the polyvinyl chloride film is somewhat sticky to the touch.
The hand is shaken, the sound is brittle, and the quality is easy to float is a polyethylene film bag. The low-pitched sound is a polyvinyl chloride film bag.
It is flammable in case of fire, the flame is yellow, there is paraffin-like oil dripping when burning, and there is a gas when the candle burns. It is a non-toxic polyethylene film bag. If it is not easy to burn, it will be extinguished when it leaves the fire. The flame is green and it is a PVC film bag.
After immersing the plastic bag in water and pressing it into the water, the polyethylene that can float out of the water surface is polyvinyl chloride (the density of polyethylene is less than water, and the density of polyvinyl chloride is greater than water; respectively, at room temperature is about 0.92 g/cm3 and 1.4 g/cm3).
It is also possible to take a copper wire and burn it red in a fire. Then, the copper wire is brought into contact with the test plastic film to cause a chemical change, and the copper wire with the plastic component is put back into the flame. At this time, it is necessary to observe carefully. If there is a colorful and dazzling green flame, it means that the plastic material contains chlorine and belongs to the polyvinyl chloride material.Learn more about identify the quality of fire hoses.