1. When recycling waste plastics, classification is very difficult and economically uneconomical.
2. Plastics are easy to burn and produce toxic gases when burned. For example, when polystyrene is burned, toluene is produced. A small amount of this material can lead to blindness, inhalation of vomiting and other symptoms. PVC burns also produces toxic hydrogen gas. Except for burning, it is a high-temperature environment that causes plastics to decompose toxic components such as benzene rings. Wait.
3. Plastics are made from petroleum-refined products and petroleum resources are limited.