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Resin usually refers to the organic polymer which has softening or melting range after heating and tends to flow under the action of external force. It is a solid, semi-solid, or liquid organic polymer at room temperature. In a broad sense, any polymer compound that can be used as a raw material for the processing of plastic products is called resin. According to the source, it can be divided into natural resin and synthetic resin. According to its different processing behavior, it can be divided into thermoplastic resin and thermosetting resin.

ResinsFigure 1. Polyester resin


Natural resin: It refers to the amorphous organic substances obtained from the secretions of animals and plants in nature, such as rosin, amber, shellac and so on. Natural resins are mainly used as coatings and can also be used in papermaking, insulation materials, adhesives, medicines, perfumes and other production processes. Some can also be used as raw materials for decorative crafts (such as amber). There are other adhesives, such as Canadian balsam. Because its refractive index is similar to ordinary glass, so it can be used as a transparent glue for optical equipment such as microscopes.

  • Synthetic resinIt refers to the resin products obtained by chemical synthesis of simple organic compounds or chemical reactions of some natural products, in which synthetic resin is the main component of plastics. The most important application of synthetic resins is the manufacture of plastics. To facilitate processing and improve performance, auxiliaries are often added, and sometimes directly used for processing and forming, so it is often synonymous with plastics. Synthetic resin is also the basic raw material for the manufacture of synthetic fibers, coatings, adhesives, insulating materials and so on. There are many kinds of synthetic resins, among which polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP) and ABS resins are the five general resins, which are the most widely used synthetic resin materials.


  1. Li Lijuan.(2009) "Progress of epoxy resin industry abroad from 2007 to 2008".. Thermosetting resin,24 (1): 49-57.
  2. Li Lijuan, Bao Zina et al (2010). "Development of Advanced Resin Matrix Composites". Thermosetting resin., 25: 43-50.

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