Registration Dossier
Registration Dossier
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EC number: 430-930-6 | CAS number: 122886-55-9
Endpoint summary
Administrative data
Description of key information
Additional information
Appearance
At ambient conditions Urea 1 is a white solid.
Melting point
The melting point of Urea 1 was determined according to EU method A.1, OECD Guideline 102 and EPA OPPTS 830.7200 guideline. Urea 1 starts melting at 217 °C using a heating rate of 1 K/min. At temperatures in the vicinity of this melting temperature the test substance starts to decompose.
Density
The relative density of Urea 1 was determined according to EU method A.3, OECD Guideline 109, and EPA OPPTS 830.7300 guideline. The density of Urea 1 was determined to be 0.912 g/cm³ at 20 °C using a gas comparison pycnometer. The determination of the relative density of Urea 1 was performed by three-fold measurements of two independent test substance samples.
Vapour pressure
The vapour pressure of Urea 1 was estimated according to EU method A.4, OECD Guideline 104, and EPA OPPTS 830.7950 guideline. The vapour pressure of Urea 1 was estimated to be < 2 E-15 Pa at 25 °C based on the boiling point calculated and using the Modified Watson Correlation. From this result, it can be concluded that the vapour pressure of Urea 1 is too low to have any relevant effect on the environment.
Partition coefficient
The partition coefficient of Urea 1 was estimated according to EU method A.8 (Leo-Hansch method), OECD Guideline 117, and EPA OPPTS 830.7570 guideline. The partition coefficient of Urea 1 was estimated to be log Pow > 6 by calculation using the Leo-Hansch method.
Water solubility
The water solubility of Urea 1 was determined according to EU method A.6, OECD Guideline 105, and EPA OPPTS 830.7840, EPA OPPTS 830.7860 guideline and DIN EN 1484 guideline. The solubility in water of Urea 1 was specified by the saturation mass concentration of the test substance in water at room temperature. The saturation concentration of Urea 1 was based on the dissolved organic carbon (DOC) found in the saturated solutions prepared. The water solubility of Urea 1 could not be determined because of the low solubility of the test substance in water and the poor sensitivity of the analytical method. Therefore the water solubility of Urea 1 was estimated to be in the range of <= 1 mg/L (quantification limit) at room temperature. Thus, Urea 1 was considered to be slightly soluble.
Auto flammability
The relative self-ignition temperature of Urea 1 was determined according to EU method A.16.
Using a linear increase in temperature of 0.5 K/min, Urea 1 shows one exothermic reactions. The exothermic reaction started at about 240 °C. A maximum temperature of about 293 °C was measured in the sample cube. At the end of the run, Urea 1 showed a loss of mass of about 72 % and coloured black. As mentioned in IUCLID section 4.2 at temperatures in the vicinity of the melting temperature (217 °C) the test substance started to decompose. In conclusion, Urea 1 is not auto-flammable, according to the criteria as described in the guidelines.
Flammability
The flammability of Urea 1 was determined according to EU method A.10.In contact with the ignition source, Urea 1 melted. In contact with the ignition source, Urea 1 melted. The melt could be ignited with the flame and burned. The burning time for Urea 1 over a distance of 200 mm was determined to be 10 minutes. In conclusion, Urea 1 is not highly flammable according to the criteria as described in the EU method A. 10. The flammability (contact with water) of Urea 1 was estimated according to EU method A.12.The chemical structure of Urea 1 does not contain chemical groups, which may lead to the conclusion that the test substance is capable of developing a dangerous amount of (flammable) gas in contact with air, damp air or water. The pyrophoric properties of Urea 1 were estimated according to EU method A.13.From the structural formula of Urea 1 it was concluded that Urea 1 is not pyrophoric. The test substance does not contain any chemical group that might lead to spontaneously ignition a short time after coming in contact with air at room temperature (circa 20 °C).
Explosiveness
The explosive properties of Urea 1 were estimated according to EU method A.14. From the structural formula of Urea 1 it was concluded that Urea 1 is not explosive. The test substance does not contain any chemically instable or highly energetic groups that might lead to an explosion.
Oxidizing properties
The oxidizing properties of Urea 1 were estimated according to EU method A.17. From the structural formula of Urea 1 it was concluded that Urea 1 has no oxidizing properties. The test substance does not contain any chemical group that might act as an oxidizing agent.
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