? ? ? Synthetic Resin industrial products can be divided into general resins and specialized resins. General resin has a large production capacity and low cost, and is generally used for general consumer goods or durable goods. Representative varieties include five categories of synthetic resins: polyethylene, polypropylene, polyvinyl chloride, polystyrene, and ABS; Specialized resins generally refer to resins produced for specific purposes, with small production volumes and high production costs. For example, they can replace metals in sectors such as machinery, electronics, and automobiles, and engineering plastics belong to the category of specialized resins. Important engineering plastics include polyamide, polycarbonate, polyoxymethylene, polybutylene terephthalate, modified polyphenylene ether, and polytetrafluoroethylene. Another type of specialized resin is thermoplastic elastomer, which has elasticity similar to rubber and can be molded repeatedly when heated.
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