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Sucroglyceride C12 -18, C18unsatd. is a white, solid paste at 20°C and 1013 hPa with faint odour.

The melting range of Sucroglyceride C12-18, C18 unsatd. is reported to be between 2 – 52 ± 2°C with a peak maximum at 27.4 ± 0.1°C (determined by differential scanning calorimetry).

No boiling point or boiling range for Sucroglyceride C12-18, C18 unsatd. could be detected prior to decomposition starting at >= 160°C using differential scanning calorimetry.

The density of Sucroglyceride C12-18, C18 unsatd. is reported to be 1.194 g/cm³ at 20°C (determined by gas displacement pycnometry according to OECD guideline 109).

In accordance with REACH Annex XI, 1. testing of the substance for particle size distribution (granulometry) is technically not feasible, as the substance is a solid paste.

The measurement of the vapour pressure of Sucroglyceride C12-18, C18unsatd. is technically not feasible due to residual water of ca. 7%, which cannot be removed by drying the substance. In case of measurement, the vapour pressure of water and not the substance itself would be measured. Thus, the vapour pressure of the main constituents was (a) calculated using EPI suite (MPBPVP v1.43) and (b) taken from a peer reviewed database (HSDB database).

The calculation resulted in4.71E-14 Pa for Sucrose, 0.011 Pa for Glycerol, 0.19 Pa for Lauric acid, 0.035 Pa for Myristic acid, 7.36E-03 Pa for Palmitic acid, 0.0011 Pa for Stearic acid, 5.11E-06 Pa for the monoglyceride C12, 6.41E-07 Pa for the monoglyceride C14, 9.51E-08 Pa for the monoglyceride C16 and 1.7E-07 Pa for the monoglyceride C18.

For Glycerol, Lauric acid, Myristic acid, Palmitic acid and Stearic acid a database search (HSDB database) was performed. The values for vapour pressure (at 25°C) obtained from HSDB database were 0.022 Pa for Glycerol,2.13E-03 Pa for Lauric acid, 1.87E-04 Pa for Myristic acid, 5.07E-05 Pa for Palmitic acid, and 5.6E-06 Pa for Stearic acid.

The value used for chemical safety assessment is 0.022 Pa at 25°C (vapour pressure of Glycerol), which can be considered as the worst case value as it is the highest vapour pressure in the substance.

Due to the complexity and the high variability in water solubility and dissociation constants of the constituents ofSucroglyceride C12-18, is rather difficult to measure a reliable octanol/water partition coefficient. A calculation of a single partition coefficient for the UVCB substance is also not feasible. Thus, the main constituents of Sucroglyceride C12-18, C18unsatd. were examined separately. Where available, data from peer reviewed databases were taken. Calculations of log Kow were performed, where no data were available.

The octanol/water partition coefficients of Sucroglyceride C12-18, C18unsatd. range from < 0 (Sucrose) to > 8 (Stearic acid).

Based on the recommendation given in the Guidance on Information Requirements (R7a), the octanol/water partition coefficients are given in ranges:

ca. 42% of the UVCB substance has a log Kow < 0

ca. 26% lies in the range of log Kow 3 to 5

ca. 12.5% has a log Kow > 5

Sucroglyceride C12-18, a complex reaction product of partial esters of glycerol and sucrose with fatty acids and unreacted glycerol, fatty acids and sucrose,containing very soluble constituents accounting for ca. 42% of the UVCB substance (Glycerol, Sucrose; solubility > 10000 mg/L) and slightly soluble to insoluble constituents (the larger part being fatty acid and fatty acid monoglycerides; solubility < 20 mg/L). Due to this composition, a single value for water solubility cannot be given.

A test on surface tension does not need to be conducted as according to REACH Regulation Annex VII, 7.6, column 2 this is only required if based on structure, surface activity can be predicted. For substances with a water solubility below 1 mg/L the test does not need to be conducted, either.

Sucroglyceride C12-18, C18unsatd. is a complex reaction product of partial esters of glycerol and sucrose with fatty acids and unreacted glycerol, fatty acids and sucrose. Glycerol and Sucrose comprise the larger part of the UVCB substance. For these constituents no surface activity is expected based on their structure. The remaining constituents, of which some may have surface active properties, are only slightly soluble in water.

No flash point for Sucroglyceride C12-18, C18 unsatd. was detected up to 120°C (Pensky-Martens, closed cup). At 120°C part of the test item starts boiling. These observations are conform with the composition of the test item, which contains ca. 7% water. This is transformed to water vapour which is incombustible.

According to REACH regulation Annex VII, 7.12, column II, a test on auto flammability does not need to be conducted for solids with a melting point below 160°C.

According to REACH Regulation (Annex XI, 1.), the study on flammability needs not to be conducted if the available data are sufficient for assessment. For the paste-like substance, a test on flash point is available.

Pyrophoricity and flammability on contact with water are not expected based on a consideration of the structure of Sucroglyceride C12-18, C18 unsatd.

According to the REACH regulation (Annex VII, 7.11, column II), the study on explosiveness does not need to be conducted, if the substance does not contain chemical groups indicating explosive properties.

According to REACH regulation (Annex VII, 7.13, column II), testing of Sucroglyceride C12-18, C18unsatd. 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 exothermally with combustible material.

According to REACH Annex IX, 7.15, column 1, a study on stability in organic solvents is only required if stability of the substance is considered to be critical.

The assessment of the dissociation constant of the registered substance is complicated. As the substance contains ionisable components (unreacted fatty acids), the pKa values for these are given.

To obtain the dissociation constants of the fatty acids Lauric acid, Myristic acid, Palmitic acid and Stearic acid a HSDB database search was performed. These are weak acids with pKa values of 5.3 (Lauric acid), 4.9 (Myristic acid), 4.75 (Palmitic acid) and 4.75 (Stearic acid).

For the other components of Sucroglyceride C12-18, C18unsatd. the dissociation constants were estimated using SPARC on-line calculator v4.6.

For Sucrose, Glycerol, monoglyceride C12,monoglyceride C14, monoglyceride C16 and monoglyceride C18 pKa values > 10 were obtained, indicating that at environmentally relevant pH no dissociation occurs.The value used for chemical safety assessment is the pKa of Lauric acid (5.3) being the major ionisable component. 

According to REACH Annex XI, 1 a study on viscosity is scientifically not necessary, as the substance is a solid paste at ambient temperature.