Poly(propylene glycol) is widely used as a lubricant in various industrial applications due to its excellent viscosity and stability. It is commonly employed in the manufacturing of hydraulic fluids and brake fluids, where it ensures smooth operation and reduces wear and tear on mechanical components. In the pharmaceutical industry, it serves as a solvent and carrier in drug formulations, enhancing the solubility and delivery of active ingredients. Additionally, it is utilized in the production of polyurethane foams, where it acts as a key component in creating flexible and rigid foams for insulation, furniture, and automotive parts. Its non-toxic nature also makes it suitable for use in personal care products, such as lotions and creams, where it functions as a moisturizer and emollient.