Diethylene glycol (DEG) is a chemical compound with the molecular formula C4H10O3. It has various industrial and commercial applications, including:

1. Hygroscopic Properties: DEG is known for its ability to attract and hold water, making it useful in applications where moisture control is necessary.
2. Solvent: It is used as a solvent in the production of various products, such as resins, inks, dyes, and chemical formulations.
3. Coolant: DEG is sometimes used as a coolant in processes where temperature regulation is required, although it is less common in this role compared to its counterpart, ethylene glycol.
4. Chemical Intermediary: It can serve as a chemical intermediate in the synthesis of other compounds.
5. Pharmaceuticals and Cosmetics: DEG is used in some pharmaceutical and cosmetic products, like creams and lotions, to help maintain the desired consistency.
6. Plastics Industry: It may be used as a plasticizer in the production of plastics to enhance flexibility and durability.

DEG’s moisture-absorbing properties and versatility as a solvent make it valuable in various industries, including chemicals, manufacturing, pharmaceuticals, and cosmetics. However, it should be handled with care, as excessive exposure can have adverse health effects.