Tetrapropylammonium-d28 chloride is the deuterium-labeled form of Tetrapropylammonium chloride. As a member of the quaternary ammonium compounds, it is a cationic salt widely applied in industrial and biomedical fields. Tetrapropylammonium chloride functions effectively as a phase-transfer catalyst, facilitating the migration of reactants between immiscible phases in organic synthesis. Additionally, it serves as a surfactant in the formulation of personal care products, cleaning agents, textiles, and pharmaceuticals. The compound is also utilized in the production of certain polymers and resins.