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The resin is divided into natural resin and synthetic resin. Natural resin refers to amorphous organic substances obtained from animal and plant secretions in nature, such as rosin, amber, shellac and the like. Synthetic resin refers to a resin product obtained by chemical synthesis of a simple organic substance or chemical reaction of certain natural products, such as a phenol resin, a polyvinyl chloride resin, etc., wherein the synthetic resin is a main component of plastics. |