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Diethyl phthalate (DEP) is a phthalate ester, namely the diethyl ester of phthalic acid. It is a clear substance that is liquid at room temperature and is only slightly denser than liquid water.
D 1787 (OTTO) Diethyl phthalate, puriss, 99%+ Cas 84-66-2 - used in plasticizers, detergent bases and aerosol sprays.