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EC number: 297-025-4 | CAS number: 93281-13-1
The results obtained in the two experiments are presented below.
The Harkins-Jordan hydrostatic correction is not necessary when using the Wilhelmy plate method.
The substance was assessed for its surface tension by using the Wilhemy plate method, according to the guidelines OECD 115, EEC A.5 and ISO 304. Three different concentrations (two preparations of each concentration) of the substance were prepared in distilled water and their surface tension was measured in specific time intervals, at the temperature of 20 °C. The reading was calibrated by the use of double distilled water and the calibration factor was determined in order to be used for the calculation of the surface tension of the test substance.
Surface tension, at 20 °C, obtained as mean value of the two experiments:
σ = 72.4 mN/m at 0.1 g/l
σ = 69.3 mN/m at 1.0 g/l
σ = 59.0 mN/m at 10 g/l
The substance is not considered to be a surface-active as the surface tension of the two out of three concentrations is above 60 mN/m, while the surface tension of the higher concentration is sligthly below 60 mN/m.
OECD guideline 115 - plate method
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