Tripropyleneglycol, also known as 1,2,3-Tripropylene glycol or TPG, is a colorless, odorless liquid with the chemical formula C9H20O4. It is a polyether compound belonging to the class of glycols. TPG is soluble in water and miscible with many organic solvents. It is commonly used as a solvent, humectant, and coupling agent in various industrial applications.