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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Description of key information

Data Waiver - In accordance with REACH Chapter R.7A Endpoint Specific Guidance, specifically R. Information Requirements on Dissociation Constant, if the substance cannot dissociate due to a lack of relevant functional groups, the dissociation constant is not required. As petroleum hydrocarbons do not contain functional groups subject to dissociation, data for this endpoint is not needed.

Key value for chemical safety assessment

Additional information

Dissociation constant values for gasoline naphthas were not determined since it was determined that petroleum hydrocarbons do not dissociate in water.