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Is Polyethylene Glycol The Same As Propylene Glycol? -- No, Polyethylene Glycol (PEG) and Propylene Glycol (PG) are distinctly different chemical compounds, despite their similar-sounding names and both being classified as glycols. PEG is a polyether compound, meaning it's a polymer formed from repeating ethylene oxide units. Its molecular weight can vary significantly, influencing its physical properties and applications. PEGs are widely used in pharmaceuticals as laxatives, in cosmetics as humectants and solvents, and in drug delivery systems. Propylene Glycol, on the other hand, is a simple organic compound, specifically a diol (an alcohol with two hydroxyl groups). It is a clear, viscous liquid commonly used as a food additive (E1520), a humectant in cosmetics, a solvent for flavors and fragrances, and in e-liquids for vaping. While both can act as solvents and humectants, their chemical structures, molecular sizes, and primary applications differ significantly. They are not interchangeable.


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