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Diethylhexyl phthalate

1. What are the properties of diethylhexyl phthalate (DEHP)?

    The source document for this Digest states:

    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
    Synonyms: DEHP
    1,2-Benzenedicarboxylic acid, bis(2-ethylhexyl) ester
    Bis(2-ethylhexyl) 1,2-benzenedicarboxylate
    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.

    1.4 CLASSIFICATION

    Classification according to Annex I of Council Directive 67/548/EEC: Human health:Toxic to reproduction, Category 2; R60-61Environment: None

    Source & ©: ECB,
     "Bis-(2-Ethylhexyl) Phthalate, DEHP), Summary Risk Assessment report" , 2008. p.3-4.

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