1 GENERAL SUBSTANCE INFORMATION
1.1 IDENTIFICATION OF THE SUBSTANCE
CAS Number: 117-81-7
EINECS Number: 204-211-0
IUPAC Name: Bis(2-ethylhexyl)phthalate
1,2-Benzenedicarboxylic acid, bis(2-ethylhexyl) ester
Bis(2-ethylhexyl) o-phthalate Bis(2-ethylhexyl) phthalate Di(2-ethylhexyl) phthalate Dioctyl phthalate
DOP (pseudo-synonym, incl. also other isomeric forms of the alcohol part)
Phthalic acid dioctyl ester
Phthalic acid, bis(2-ethylhexyl) ester
Molecular weight: 390.6
Molecular formula: C24H38O4
Structural formula: The name DEHP is used in this assessment.
1.2 PURITY/IMPURITIES, ADDITIVES
The limited data available on purity indicates a high purity level (99.7%). Impurities found are mainly other phthalates. Some DEHP is, when requested by the user, supplied with "Bisphenol A"; 4,4’-isopropylidenediphenol (CAS No. 80-05-7) as an additive in the range of 0.025 to 0.5%.
1.3 PHYSICO-CHEMICAL PROPERTIES
DEHP is a colorless liquid at room temperature. The vapour pressure is estimated to 3.4 . 10-5Pa at 20°C. A wide range of values on the water solubility (0.0006 – 1.3 mg/L at 20-25°C) is available in the literature. The probable explanation is that DEHP readily forms more or less colloidal dispersions in water. Natural constituents in water may influence the solubility. A non-colloidal solubility of 0.003 mg/L is chosen for the Risk assessment. The Henry´s law constant for DEHP is 4.43 Pa m3/mol. The octanol-water partition coefficient, log Kow, is 7.5. However, in the model calculations (EUSES 1.0) the highest recommended value of 7.0 is used.
A summary of the physico-chemical properties of DEHP is shown in Table 1.1.
Classification according to Annex I of Council Directive 67/548/EEC: Human health:Toxic to reproduction, Category 2; R60-61Environment: None