Registration Dossier
Registration Dossier
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EC number: 205-550-7 | CAS number: 142-62-1
Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
very weakly surface active (CMC = 3.4 g/L)
Key value for chemical safety assessment
Additional information
The surface activity of hexanoic acid can be assessed by using CMC value (3.4 g/L) and the substance is considered to be very weakly surface active.
According to experts of US EPA’s New Chemicals Program, carboxylic acids are identified "as a potential subclass of chemicals under the anionic surfactants category with a hazard concern for toxicity to aquatic organisms. However, measured and estimated critical micelle concentrations for the particular carboxylic acids in this cluster range between 3.4 E+03 mg/L for hexanoic acid (C6) to 618 mg/L for hexadecanoic acid (C16), indicating that these molecules are very weak surfactants and posses surfactant-like properties only at very high concentrations".
In the light of this statement, not reported concentration values in the case of the literature value (surface tension: 23.4 mN/m at 70 °C), as well as the company data (surface tension: 23 mN/m at 70 °C) are presumably very high and non-relevant for the conditions required for this endpoint.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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