Polyethylene glycol is a hydrophilic polymer with a CAS number of 25322-68-3. The appearance of the product varies depending on its molecular weight. Low molecular weight is a colorless viscous liquid, while high molecular weight is a white waxy solid or thin sheet. Its core characteristics are good water solubility, high biocompatibility, non-toxic and non irritating, wide molecular weight range (400-20000+), and can adapt to different application needs. The application fields cover medicine, chemical engineering, and scientific research: used as ointment base, suppository base, tablet lubricant, and penetration enhancer in medicine; Used as plasticizers and lubricants in industry; Used as a gas chromatography stationary phase and DNA conversion reagent in the laboratory. The product should be stored in a sealed, cool, dry, and well ventilated place to avoid contact with oxidants.