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Vacuum degree is the most important process parameter for rotary evaporators, and users often encounter the problem of insufficient vacuum degree, which is often related to the properties of the solvents used. In industries such as biochemical pharmaceuticals, water, ethanol, acetic acid, ethyl ether, petroleum ether, chloroform, toluene, etc. are often used as solvents. However, general vacuum pumps cannot withstand strong organic solvents, and special corrosion-resistant vacuum pumps can be selected. (We recommend using a water circulation vacuum pump, which is available in our company).