PTA is purified terephthalic acid, which is the downstream product of petroleum, but it is the main raw material for producing polyester, polyester and diaphragm. Polyester can supplement cotton silk instead of making clothes; Diaphragm, etc. It can be used as a beverage bottle for you to drink, the plastic kind.

PVC is polyvinyl chloride, which is mainly used to make building profiles and wires. For example, when your home is renovated, the windows are white like plastic, and that's it. The most famous is the Valin Pipeline. In addition, the water pipes at home are basically made of this material. There are many flip-flops now, made of PVC. There are also some plastic greenhouses, which are different from those made of plastic. The greenhouse made of PVC is light blue.