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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Water solubility

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Administrative data

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Description of key information

C8-18 AAPB, C12 AAPB : visually unlimited soluble in water (formation of micelles)
C8-18 AAPB molecules: <=400 mg/L at 20°C (based on surface tension/CMC measurements); CMC formation range: 400-900 mg/L
C12 AAPB molecules is <=250 mg/L at 20°C (based on surface tension/CMC measurements); CMC: ca. 250 mg/L

Key value for chemical safety assessment

Water solubility:
250 mg/L
at the temperature of:
20 °C

Additional information

(formation of micelles. The water solubilities of C8-18 AAPB and C12 AAPB molecules based on surface tension measurements are <=400 mg/L at 20°C. All AAPBs are similar in structure, contain all the same zwitterionic structure. They differ, however, by their carbon chain length distribution and the degree of unsaturation (<=20%) in the fatty acid moiety. The content of minor constituents in all products are comparable and differ to an irrelevant amount. Based on the available data, it can be assumed that chain length distribution and degree of unsaturation of the fatty acid chain have a minor impact on this endpoint.