合成树脂是塑料的主要成分，其在塑料中的含量一般在40%～100%。由于含量大，而且树脂的性质常常决定了塑料的性质，所以人们常把树脂看成是塑料的同义词。例如把聚氯乙烯树脂与聚氯乙烯塑料、酚醛树脂与酚醛塑料混为一谈。其实树脂与塑料是两个不同的概念。
Synthetic resin is the main component of plastics, and its content in plastics is generally 40% - 100%. Because of its high content, and the nature of resin often determines the nature of plastic, so people often regard resin as a synonym for plastic. For example, PVC resin and PVC plastic, phenolic resin and phenolic plastic are confused. In fact, resin and plastic are two different concepts.
树脂是一种未加工的原始聚合物，它不仅用于制造塑料，而且还是涂料、胶粘剂以及合成纤维的原料。而塑料除了极少一部分含100%的树脂外，绝大多数的塑料，除了主要组分树脂外，还需要加入其他物质。
Resin is a kind of raw polymer, which is not only used in the manufacture of plastics, but also the raw material of coatings, adhesives and synthetic fibers. In addition to a small part of plastics containing 100% resin, the vast majority of plastics, in addition to the main component resin, also need to add other substances.