Diethylene glycol monoethyl ether is a colorless, transparent liquid with slight hygroscopicity at room temperature, miscible with water and most organic solvents. Its molecular structure contains an ether bond and a hydroxyl group, along with a polyoxyethylene chain, which provides chemical stability, a good hydrophilic-lipophilic balance, and strong coupling ability. Due to its high boiling point, low volatility, and excellent solubility, it is primarily used as an efficient solvent and coupling agent in water-based coatings, inks, and cleaning agents. It also serves as a reaction medium or solvent in dyes, electronics cleaning, and organic synthesis. It should be noted that this substance possesses certain toxicity, and protective measures should be taken during use.