Tetrabutylurea

Endpoint summary

Additional information

At standard conditions, tetrabutyl urea is an odourless, colourless to yellowish organic liquid. In a study conducted according to OECD Guideline 102 and EU Method A.1 no melting point could be determined. Tetrabutyl urea, however, showed a glass transition at ca. -109°C. The boiling point of tetrabutyl urea is reported to be 305°C. The relative density D (20/4) was determined to be 0.8764 in a study conducted according to OECD Guideline 109 and EU Method A.3. According to REACH Regulation (Annex VII, 7.14, column II), the study on granulometry does not need to be done if the substance is used or marketed in a non granular or non solid form. This statemement holds true for tetrabutyl urea. The vapour pressure of tetrabutyl urea was investigated in a study conducted according to OECD Guideline 104 and EU Method A.4. The calculation of the vapour pressure based on measured values and using the Antoine equation yielded a value of 1.9 x 10E-4 hPa at 20°C. In a study conducted according to OECD Guideline 117 and EU Method A.8, the partition coefficient n-octanol/water (log Kow) was determined to be 6.2 at 25°C. The water solubility of tetrabutyl urea was determined to be 4.3 mg/L at 20°C in a study conducted according to OECD Guideline 105 and EU Method A.6. 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 or surface-activity is a desired property of the substance under investigation. Tetrabutyl urea does not contain any functional groups indicating surface-active properties. The flash point (closed cup) was determined to be 127°C at 1013 hPa in a study conducted according to EU Method A.9. The determination of the auto-ignition temperature via the EU Method A.15 resulted in a value of 350°C at 1007 hPa. According to REACH Regulation (Annex XI, 1.), a study on flammability does not need to be done if based on the available data the substance can be classified, labelled and/or the risk of the substance can be assessed. Tetrabutyl urea is a liquid at room temperature. For liquids the primary value for ease of ignition is the flash point. 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. Tetrabutyl urea does not contain any chemical groups indicating explosive properties. According to REACH Regulation (Annex VII, 7.13, column II), testing of tetrabutyl urea 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 on the stability in organic solvents and identity of relevant degradation products needs only to be done if this property is considered as essential. The stability of tetrabutyl urea is not considered to be critical. 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 necessary from a scientific point of view. Tetrabutyl urea does not contain any functional groups that are susceptible to dissociation at environmental relevant pH values.

The kinematic viscosity of tetrabutyl urea was investigated in a study conducted according to OECD Guideline 114 and DIN 51 562 - part 1 using the capillary viscometer method. The kinematic viscosity at 20°C was determined to be 17.6 mm²/s.