Plastics are easy to burn and produce toxic gas when burned. For example, when polystyrene is burned, toluene is produced. A small amount of this substance can cause blindness, vomiting and other symptoms when inhaled. The burning of PVC can also produce hydrogen chloride toxic gas. In addition to burning, the high temperature environment will cause the plastic to decompose to toxic components, such as benzene.
Plastics are made from petroleum refining products, and petroleum resources are limited.
Plastics can rot after being buried under the ground for hundreds of years.
Plastics have poor heat resistance and are prone to aging.
