Synthetic leather, leather is a good substitute for doing winter leather jackets, but due to the use of synthetic leather TPU (polyurethane elastomer) from the processing. The TPU price from the very expensive, so a lot of domestic manufacturers to use to partially replace PVC, they are doing: the cloth first coated with PVC (artificial leather) and then then this price can be greatly decreased, but PVC plasticizer migrates out less than a year, resulting in synthetic leather (in fact, leather) hard and brittle, so some customers may buy new armored crisp edge less than a year, cracking, and in fact this planted in the production of synthetic leather factory called him a semi-synthetic leather or semi-PU leather. Semi-PU leather can be a very simple way to identify, it is to use copper in heat, until the fire is red color (not green) when the red-hot copper is also the fire, the wire immediately put on the synthetic leather, synthetic leather melts onto the copper wire, and finally, the copper and then put on the fire to burn. If the fire is green, then prove PVC, is a semi-PU leather, if at this time fire is red then the proof is PU leather.
This method is a simple method that can be done in general identification, but can not be formally identified, because there are some PU leather auxiliaries added containing chlorine can cause false positives. The best way is to use the method of infrared spectroscopy were identified, this method can only be identified to authorities.