1. If you are purchasing from outside, you can distinguish it by twisting (there are folding marks after PVC twisting, but PET is not) or burning (by smelling, watching the color of the flame, etc.).
2. If it is in the factory, it can be melted into a very thin sheet by heating a certain amount of raw materials. The quality of PET can be determined by looking at the color of the film (transparency, viscosity during melting, smell when melted, etc.) At the same time, you can see how much impurities (qualitative) in the film, such as whether there is insoluble matter such as sand. PVC is carbonized at a certain temperature, and only the amount of carbonized part in the film can be seen to see the level of PVC content;
3. The quantitative raw materials (excluding the bottle cap and the label paper) are placed in an oven and heated to a certain temperature for a long enough time. After being taken out and weighed, the moisture content can be measured. Since the PVC is charred at a certain temperature, When the amount of carbonized carbon in the baking material is picked up, the content of PVC can be measured.
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