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Physical & Chemical properties

Surface tension

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Description of key information

The surface tension of pentadecanol, branched and linear is not quantified. A value in the range ca. 30 mN/m to ca. 66.5 mN/m at ca. 90% saturated aqueous solution is estimated by read-across from undecan-1-ol and (Z)-octadec-9-enol. 

Key value for chemical safety assessment

Additional information

A preliminary assessment by calculated Hydrophilic Lipophilic Balance suggests that no surface tension lowering property would be expected on the basis of structure alone.

The main purpose of determining surface tension is to assess whether a substance is a surfactant and not able to have a log Kow done. The structural analogue n-octanol, which is considerably more soluble in water than pentadecanol, branched and linear, is regularly used with water in the classic two-phase partitioning experiment (e.g. OECD Guideline 107). Octanol and all alcohols do phase separate which suggests that emulsification is not so strong as to create issues with measurement of partitioning or other fate or effects studies.

The Category hypothesis is that the long chain linear aliphatic alcohol family has at its centre an homologous series of increasing carbon chain length, which is associated with a consistency and predictability in the property data across the group, for the physicochemical, environmental, and toxicological property data sets. Predictivity of the surface activity behaviour of pentadecanol, branched and linear being intermediate between that of undecan-1-ol and (Z)-octadec-9-enol is considered to be reasonable.