How to distinguish PE plastic bags from PVC plastic bags
2022-09-23 14:25How to distinguish PE plastic bags from PVC plastic bags？
(1) Touch method
It feels smooth to the hand, and the surface looks like a layer of wax (called wax feeling in chemistry). This is a non-toxic polyethylene film bag, while the PVC film feels a little sticky.
⑵ Jitter method
It's a polyethylene film bag that shakes with hands, makes the sound brittle, and floats easily. While those with hands shaking and low voice are PVC film bags.
(3) Combustion method
Flammable in case of fire, the flame is yellow, paraffin-like oil drops when burning, and the 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.
⑶ Immersion method
Immerse the plastic bag in water, and press it into the water with your hands. When it comes out of the water, it is polyethylene, and when it sinks into the water, it is PVC (the density of polyethylene is lower than that of water, but the density of PVC is higher than that of water; About 0.92g/cm3 and 1.4g/cm3 respectively at room temperature).
In addition, a copper wire can also be used, and it will be burned into red in the fire. Then, the copper wire will be contacted with the plastic film for testing, resulting in a chemical change, and then the copper wire dipped in the plastic component will be put back into the flame. At this time, careful observation is needed. If there is a colorful and dazzling green flame, it means that this plastic material contains chlorine element and belongs to PVC.