树脂有天然树脂和合成树脂之分。天然树脂是指由自然界中动植物分泌物所得的无定形有机物质，如松香、琥珀、虫胶等。合成树脂是指由简单有机物经化学合成或某些天然产物经化学反应而得到的树脂产物，如酚醛树脂、聚氯乙烯树脂等，其中合成树脂是塑料的主要成分。
Resins are divided into natural resins and synthetic resins. Natural resins are amorphous organic substances, such as rosin, amber and shellac, derived from the secretions of animals and plants in nature. Synthetic baohuguan.37ix.com.cnmppguan.37ix.com.cnboligang.37ix.com.cnhdpeguan.37ix.com.cndutongxw.37ix.com.cn jubingxixw.37ix.com.cnresins refer to resin products, such as phenolic resins and polyvinyl chloride resins, obtained by chemical synthesis of simple organic compounds or chemical reaction of some natural products, in which synthetic resins are the main components of plastics.