8 Final Report on the Safety Assessment of Butylene Glycol, Hexylene Glycol, Ethoxydiglycol, and Dipropylene Glycol

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Abstract
Butylene Glycol, Hexylene Glycol, Ethoxydiglycol, and Dipropylene Glycol are viscous liquids used in the cosmetic industry as humectants, emulsifiers, plasticizers, and solvents. The results of acute, subchronic, and chronic oral toxicity studies using a variety of animal species indicate a low order of toxicity for the Glycols. Results of parenteral injection, inhalation, and acute and subchronic cutaneous toxicity studies likewise support a low order of toxicity. Butylene Glycol, Ethoxydiglycol, and Dipropylene Glycol caused minimal to mild irritation of rabbit skin, whereas Hexylene Glycol was moderately irritating. The Glycols produced mild to severe ocular irritation when tested in rabbits, with Hexylene Glycol producing the most severe irritation. Although undiluted Hexylene Glycol produced severe ocular irritation, a 25 percent aqueous solution produced no signs of irritation. Undiluted Butylene Glycol was not an eye irritant to rabbits but was to humans. Human skin patch tests on undiluted Butylene Glycol and undiluted Hexylene Glycol produced a very low order of primary skin irritation. A repeated insult patch test on Butylene Glycol produced no evidence of skin sensitization. Based on the available data it is concluded the Butylene Glycol, Hexylene Glycol, Ethoxydiglycol, and Dipropylene Glycol are safe as presently used in cosmetics.