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Dissociation constant

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Description of key information

not applicable

Key value for chemical safety assessment

Additional information

The substance "Reaction product of thermal process between 1000°C and 2000°C of mainly aluminium oxide and calcium oxide based raw materials with at least CaO+Al2O3 >80% , in which aluminium oxide and calcium oxide in varying amounts are combined in various proportions into a multiphase crystalline matrix"  is an UVCB substance. In accordance with column 2 of REACH Annex XI (1907/2006), the dissociation constant study does not need to be performed due to the fact that it is scientifically not possible to perform the test for such UVCB substance. Likewise it is impossible to determine the pKa values of the single constituents in the UVCB by any mathematical calculation. According to ECHA Guidance on information requirements and chemical safety assessment R.7.1.17, the dissociation constant in water is important for ionisable organic substances, while the substance is inorganic.