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Polyethylene glycol (PEG) Chemical Grade Liquid form ␣ Poly ethylene glycols (PEGs) are family of water-soluble linear polymers formed by the additional reaction of ethylene oxide (EO) With mono ethylene glycols (MEG) or diethylene glycol. The generalized formula for polyethylene glycol is: H(OCH2 CH2) n OH N: Average number of repeating ethylene oxide groups. There are many grades of PEGs that represents them by theirs average molecular weight. For example, PEG 400 consists of a distributi