Plastics are the materials that can be molded. From "plastic" is from the Greek root-integrate alternative "plastikos"-means can be cast. There are 2 main types of plastic: heat resistant plastic and resin thermal reaction. Heat resistant plastic like wax-they can be many times under a proper temperature. Thermal reaction resin can be cast or a one-time only hardening under special conditions.Only a small portion-approximately 4% of the world's oil is used to make plastic. Plus the plastic can be easily reused, and in many cases, can be recycled, the longevity of the oil stretched out even more. And if to compare with the fuel used in vehicles and construction, using only 1 time (and spend most of 88% of the world's oil resource), then the plastic has a high use value than many in.
đang được dịch, vui lòng đợi..