Registration Dossier
Registration Dossier
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EC number: 273-050-6 | CAS number: 68936-98-1 The complex combination of hydrocarbons produced by the distillation of products from cumene manufacturing process. It consists primarily of diisopropylbenzene with various small amounts of C4 substituted benzenes and heavier non-aromatic hydrocarbons.
Endpoint summary
Administrative data
Description of key information
Additional information
Cumene bottoms represents the distillation residues of 1-methylethylbenzene and belongs to the class of UVCB-substances. Cumene bottoms is an organic liquid with a characteristic odor. As no exothermal or endothermal effects were observed in the DSC runs in the temperature range of -100°C up to 50°C, the melting point of the test item is <-100°C at atmospheric pressure. The boiling range of cumene bottoms was determined to be 188 -189°C at 1013 hPa using differential scanning calorimetry. The relative density (D20/4) of the test substance was determined to be 0.87. According to REACH Regulation (Annex VII, 7.14. Column 2), a study on granulometry does not need to be conducted if the the substance is marketed or used in a non solid or non granular form. This holds true for cumene bottoms. Based on the experimental data, the vapour pressure of cumene bottoms was calculated to 7 hPa at 20°C. Experimental determination of the octanol-water partition coefficient and the water solubility has been omitted according to REACH Regulation (Annex XI, 2.) as it is technically not possible to conduct studies on thess endpoints as a consequence of the properties of this UVCB-substance. According to REACH Regulation (Annex VII, 7.6, column 2), the study on surface tension does not need to be done if the water solubility at 20°C is less than 1 mg/L. In the safety data sheet of the manufacturer, cumene bottoms is reported to be insoluble in water (water solubility: < 0.1 mg/L). The flash point and the auto-ignition temperature were determined to be 54.5°C at 1013 hPa and 415°C at ca. 1006 hPa, respectively. A flammability of the test item in contact with water or damp air was not observed during the period of 7 h and at temperatures ranging from 22.3-23.2°C. The test item has no explosive (heat of decomopsition < 500 J/g) and no oxidising properties. As the differential scanning calorimetry showed no exothermal or endothermal effects up to the maximum temperature of 500°C, the test substance can be regarded as thermally stable.
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