By what method can PU leather and PVC leather be distinguished?

PU leather and PVC leather are two different kinds of leather, so do you know how to distinguish them?
Wenzhou Longyuan International Co., Ltd. was established in 1998. The company is a company specializing in the research and development, production and sales of synthetic (artificial) leather fabrics. The company’s products include more than a dozen categories such as clothing, footwear, bags, furniture, and stationery.
1. Distinguish the back of the fabric
PU leather and PVC leather generally have a cloth base/knitted cloth base on the back, which can be seen with the naked eye.
2. to melt by burning
Take a small piece of fabric and put it on the fire, the leather fabric will not melt, but the artificial leather and synthetic leather will melt.
3. Gasoline immersion
Soak a small piece of fabric in gasoline for 30 minutes and then take it out. PVC leather will become hard and brittle, but PU leather will not.
We can differentiate the two by these three methods.