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Surface tension

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Description of key information

Based on read across from aluminum, benzoate C16-18 fatty acids complexes, the surface tension of a 90% saturated aqueous solutions is estimated to be 72.6 mN/m at 20.0 ± 0.5°C. (Benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium is considered not to be surface active. 

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Surface tension:

Additional information

As no data was available for the surface tension of (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium, the endpoint was read across from the substance aluminum, benzoate C16-18-fatty acids complexes. The surface tension of the read-across substance was determined in a proprietary, GLP-compliant ring balance test following OECD guideline 115 (Harlan 2013).

Aluminum, benzoate C16-18-fatty acids complexes (CAS No. 94166-87-7, EC No. 303-385-6) is considered suitable for read across to (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium as it is structurally similar being an approximate 2:1 mixture of (benzoato-O,O')hydroxy(octadecanoato-O,O')aluminium and (benzoato-O,O')hydroxy(hexadecanoato-O,O')aluminium. The only significant difference therefore is the presence of about 30% of the aluminium complex containing the saturated C16-fatty acid, hexadecanoate, in place of the saturated C18-fatty acid, octadecanoate. This small difference in composition is expected to have no influence on surface tension.