Synthetic resin is the most important component of plastics, its content in plastic is generally 40%~100%. Because of the large content, and the nature of the resin often determines the nature of plastics, so people often think of resin as a synonym for plastic. For example, PVC resin and polyvinyl chloride plastic, phenolic resin and bakelite confused. In fact, resin and plastic are two different concepts. Resin is an unprocessed raw macromolecule, which is used not only for making plastics, but also for paints, adhesives and synthetic fibres. and plastic, in addition to a very small portion containing 100% of the resin, most of the plastic, in addition to the main components of resin, but also need to add other substances.