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Cesium tetrafluoroaluminate (CsAlF4) is a white powder with a melting range between approx. 420-480°C and a decomposition temperature of > 550°C. Its density is 3644 kg/m3 and its water solubility is 13 g/L at pH6 at room temperature. Determination of the boiling point and vapour pressure of CsAlF4 does not need to be conducted as the melting point is well above 300°C. Testing on partition coefficient and flash point do not need to be performed as the substance is inorganic. Surface tension does not need to be determined as it is not expected based on the substance structure nor a desired substance property. The explosiveness does not need to be tested as CsAlF4 does not contain chemical groups associated with explosive properties. The oxidising properties do not need to be tested as the substance is expected to be incapable of reacting exothermically with combustible materials based on its chemical structure.

Testing of the following endpoints is considered scientifically unjustified according to section 1 of REACH Annex XI. Flammability and autoflammability were not tested as both metal ions (cesium and aluminum) are already present in the highest possible oxidation state and fluorine is a more electronegative element than oxygen. The interaction with oxygen is therefore not possible and the substance is essentially non-flammable. Furthermore, based on the experience in handling the substance, the substance does not exhibit water reactivity or pyrophoric properties.

Particle size distribution finally, was determined by laser diffraction; results were as follows: D10 = 14.4 µm; D50 = 33.5 µm; D90 = 50.5 µm.