Structural Formula Vector Image
Title: DEHP
CAS Registry Number: 117-81-7
CAS Name: 1,2-Benzenedicarboxylic acid bis(2-ethylhexyl) ester
Additional Names: bis(2-ethylhexyl) phthalate; di(2-ethylhexyl) phthalate; DOP; dioctyl phthalate
Trademarks: Octoil
Molecular Formula: C24H38O4
Molecular Weight: 390.56
Percent Composition: C 73.81%, H 9.81%, O 16.39%
Literature References: Dialkyl phthalate ester plasticizer used to impart softness and flexiblilty to PVC products. Prepn: P. J. Garner, G. Watson, US 2508911 (1950 to Shell). Effect on dynamic mechanical properties: D. L. Hertz, Jr., Elastomerics 116, 20 (1984); interaction with PVC polymer: B. Garnaik, S. Sivaram, Macromolecules 29, 185 (1996). HPLC determn in PVC packaging: M. F. Aignasse et al., Int. J. Pharm. 113, 241 (1995). GC/MS determn in toys: R. Stringer et al., Environ. Sci. Pollut. Res. Int. 7, 27 (2000). Evaluation of carcinogenic risk: J. Doull et al., Regul. Toxicol. Pharmacol. 29, 327 (1999); of health effects: M. Fay et al., Toxicol. Ind. Health 15, 651 (1999). Review: L. G. Krauskopf, Plast. Compd. 6, 28-38 (1983). Review of environmental fate: C. A. Staples et al., Chemosphere 35, 667-749 (1997); of aquatic toxicity: idem et al., Environ. Toxicol. Chem. 16, 875 (1997); of toxicology and human exposure: Toxicological Profile for Di(2-ethylhexyl)phthalate (PB2003-100138, 2002) 337 pp.
Properties: Liquid, mp -47°. bp5mm Hg 231°. Flash point (closed cup): 206°C (403°F). d2020 0.986. nD20 1.486. Viscosity (cSt): 386 (0°); 22 (20°); 31 (37.8°); 5 (100°). Vapor pressure (mm Hg): (100°) 0.003; (200°) 1.20; (300°) 96.
Melting point: mp -47°
Boiling point: bp5mm Hg 231°
Flash point: Flash point (closed cup): 206°C (403°F)
Index of refraction: nD20 1.486
Density: d2020 0.986
CAUTION: Potential symptoms of overexposure are irritation of eyes and mucous membranes. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 118. This substance is reasonably anticipated to be a human carcinogen: Report on Carcinogens, Eleventh Edition (PB2005-104914, 2004) p III-123.
Use: As plasticizer in PVC applications and flexible vinyls.

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