Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

Appearance:

Cesium sulphate is a colourless, odourless inorganic solid.

Melting point:

The melting point of cesium sulphate was determined to be 1006 °C at 1013.25 hPa.

Boiling point:

In accordance with column 2 of Reach Regulation (EC) No 1907/2006 Annex VII section 7.3, the study does not need to be conducted for solids which either melt above 300 °C or decompose before boiling. The melting point of cesium sulphate was determined to be 1006 °C at 1013.25 hPa (see above or IUCLID Section 4.2: Key.001.Melting point.AQura GmbH.2010).

Density:

The density of cesium sulphate was determined to be 4.25 g/cm³ at 20 °C.

Particle size distribution:

The averages of three measurements were as follows: d10: 119 µm, d50: 214 µm, d90: 339 µm.

Vapour pressure:

In accordance with column 2 of Reach Regulation (EC) No 1907/2006 Annex VII section 7.5, the vapour pressure does not need to be conducted if the melting point is above 300 °C. The melting point of cesium sulphate was determined to be 1006 °C at 1013.25 hPa (see above or IUCLID Section 4.2: Key.001.Melting point.AQura GmbH.2010). Therefore, a study on vapour pressure is not required.

Partition coefficient:

In accordance with column 2 of REACH Regulation (EC) No 1907/2006 Annex VII, the test on partition coefficient n-octanol/water (required in REACh Regulation, Annex VII, section 7.8) does not need to be conducted if the substance is inorganic. Cesium sulphate is an inorganic compound. The log Kow of the cesium sulphate was estimated to be 1.58. However, cesium sulphate is an inorganic salt and the value calculated with the program KOWWIN should be considered with caution. Due to the salt character of cesium sulphate and its good water solubility the log Pow is assumed to be around 0.

Water solubility:

The water solubility of cesium sulphate was determined to be > 1000 g/L.

Surface tension:

The surface tension of cesium sulphate was determined to be 71.1 mN/m at 20 °C.

Flash point:

As cesium sulphate is a solid at room temperature, the determination of the flash point is scientifically unjustified and therefore was not performed. Instead, a test on flammability for solids upon contact with air was conducted (see below or IUCLID Section 4.13).

Autoflammability:

Up to about 400 °C no exothermic reaction of the sample was observed.

Flammability:

Because of the result of the prelimitary test, cesium sulphate is considered non flammable. No flammability in contact with water and no pyrophoric properties are expected for the test item.

Explosiveness:

As the sample was neither shock sensitive nor thermally or friction sensitive, according to the criteria of the EU Method A.14, cesium sulphate is not representing an explosive hazard and has not to be considered to present a danger of explosion.

Oxidising properties:

Test on oxidizing of cesium sulphate was performed according to the EU Method A.17. The highest burning rate of 3.45 mm/s was obtained with the mixture of 20 % test item : 80 % cellulose. This rate was definitely lower than the highest rate of the reference mixtures (3.63 mm/s). Therefore the test item is assessed to have no oxidizing properties.

Stability in organic solvents:

In accordance with column 2 REACH Regulation (EC) No 1907/2006 Annex IX section 7.15, the study which examines stability in organic solvents does not need to be conduczed as the test substance cesium sulphate is an inorganic substance.

Dissociation constant:

The dissociation constant was not determinable because cesium sulphate is a strong electrolyte.

Viscosity:

The study which examines viscosity and is required according to REACH Regulation (EC) No 1907/2006 Annex IX section 7.17 does not need to be conducted as the test substance cesium sulphate is not a liquid.