Dow Dowex fine spherical ion exchange resin Dowex fine resin adopts the selective controlled suspension polymerization technology used in Dow production standard 16-50 mesh industrial resin. The resin produced by this technology is more complete and uniform, with the highest level of selectivity, consistency and reliability. Therefore, it can provide excellent dynamic performance and filling performance in chromatographic separation, without problems of abrasive resin or granular resin. By controlling the suspension polymerization manufacturing process, the particle size of Dowex fine resin can be strictly controlled, so as to avoid dust easily generated due to ultrafine particles when processing dry resin, and to avoid the physical loss and resin loss caused by the fine particles blocking the sieve plate or filter and prolonging the loading time of batch processing when used as chromatography medium or filter aid.