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Monopropylene Glycol (also known as propylene glycol or propane-1,2-diol) is an organic compound with the chemical formula C3H8O2. It is a viscous colourless liquid which is nearly odourless but possesses a faintly sweet taste. Chemically it is classed as a diol and is miscible with a broad range of solvents, including water, acetone and chloroform.

It is produced on a large scale and is primarily used in the production of polymers but also sees use in food procession as the E-number E1520.