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Surface tension

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Description of key information

Surface tension [Fatty alcohols C16 – C18 (even numbered), branched and linear]: Not surface active

Key value for chemical safety assessment

Additional information

On the basis of structure, the substance is not expected to be surface active. Therefore, the requirement for testing is waived in accordance with Column 2 of REACH Annex VII.

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

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 isostearyl alcohol based on (Z)-octadec-9-enol is considered to be reasonable.

The surface tension of Fatty alcohols C16 – C18 (even numbered), branched and linear is not quantified. A value of ca. 66.5 mN/m at ca. 90% saturated aqueous solution is estimated by read-across from (Z)-octadec-9-enol (CAS No: 143 -28 -2).