Registration Dossier

Physical & Chemical properties

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Additional information

At standard conditions, benzophenone is a colourless organic solid which crystallises in the form of orthorhombic bisphenoidal prisms from alcohol or ether and has a geranium or sweet, rose-like odor. The melting point of benzophenone lies in the range between 47.8 and 51°C. The boiling point and the relative density are reported to be ca. 305°C at 1013 hPa and 1.1108 at 18 °C, respectively. The particle size distribution of benzophenone crystals was analysed by laser diffraction technology. Median diameter of D (v, 0.1)=23.18 µm, D (v, 0.5)=228.04 µm, D (v, 0.9)=695.93 µm, D (4, 3)=302.12 µm, and D (3, 2)=60.16 µm were determined. The vapor pressure is reported to be 0.00257 hPa at 25 °C. The experimentally determined log Pow of benzophenone is 3.18 at 25°C. The water solubility of benzophenone is 23.9 mg/L. According to the classification scheme, benzophenone can be considered as slightly soluble in water. Benzophenone has a solubility of 133.3 g/L in alcohol and 166.67 g/L in ether. According to REACH Regulation (Annex VII, 7.6, column II), the study on surface tension needs only to be done if based on the structure surface-active properties are to be expected or predicted. Benzophenone does not contain any chemical groups indicating surface-active properties. The flash point was determined to be in the range between 138 and 155 °C. According to REACH Regulation (Annex VII, 7.12, column II), the study on auto flammability does not need to be done if the melting point of a solid is < 160°C. The melting point of benzophenone is ca. 50°C. Benzophenone is not susceptible to ignition on contact with air. The flammability range of gaseous benzophenone is reported to be 0.7 - 5.4 vol%. According to REACH Regulation (Annex VII, 7.11, column II), the study on explosiveness does not need to be done if the substance does not contain chemical groups indicating explosive properties. Benzophenone does not contain any chemical groups indicating explosive properties. According to REACH Regulation (Annex VII, 7.13, column II), testing of benzophenone for oxidising properties does not need to be conducted, as the substance does not contain any structural groups known to be correlated with a tendency to react exothermically with combustible material. According to REACH Regulation (Annex IX, 7.15, column I), the study is only required if stability of the substance is considered to be critical. Benzophenone is due to structural aspects stable in organic solvents. According to REACH Regulation (Annex IX, 7.16, column II), the study on the dissociation constant does not need to be done if testing is not possible from a scientific point of view. Benzophenone does not contain any functional groups that are susceptible to dissociation. According to REACH Regulation (Annex XI, 2.), testing of viscosity does not need to be done if this is technically not feasible. Benzophenone is a solid at standard conditions and viscosity refers to liquids only.