Synthetic leather is a good leather substitute for winter leather jackets, but because synthetic leather is processed with TPU (polyurethane elastomer). The price of TPU is very expensive, so many domestic manufacturers use PVC to partially replace it. They do this: first coat the cloth with PVC (artificial leather) and then the price can be greatly reduced, but PVC In less than a year, the plasticizer will migrate out, causing the synthetic leather (actually artificial leather) to become hard and brittle. Therefore, some customers buy a new armor but it becomes brittle and cracks in less than a year. In fact, this The factory that produces synthetic leather calls him semi-synthetic leather or semi-PU leather. Semi-PU leather can be identified by a very simple method, that is, use copper wire in the fire to heat, until the color of the fire is red (not green), the copper wire is also red in the fire, and the copper wire is immediately Put the synthetic leather on the synthetic leather, and the synthetic leather will melt on the copper wire. Finally, put the copper wire on the fire again. If the fire is green at this time, it is proved that there is PVC, which is half PU leather. The fire is red, it proves to be PU leather.

This method is a simple method and can be used for general identification, but it cannot be used for formal identification, because some additives added to PU leather contain chlorine which can cause misjudgment. The best way is to use infrared spectroscopy for identification, this method can only be identified by the authority.