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Surface tension

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Description of key information

The surface tension of the test substance was assessed using a ring method, according to Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. 
The surface tension of duplicate 90 % saturated solutions of test item in water was determined to be 61.2 to 64.3 ± 1.0 mN/m at 20.0 ± 0.5 °C.  A range has been reported as the test item showed time dependent surface active properties, with a gradual increase in surface tension value with time.
The test item was considered to be not surface-active.

Key value for chemical safety assessment

Surface tension:
61.2

Additional information

The surface tension of duplicate 90 % saturated solutions of test item in water was 61.2 to 64.3 ± 1.0 mN/m at 20.0 ± 0.5 °C according to Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 using a ring method.

A range has been reported as the test item showed time dependent surface active properties, with a gradual increase in surface tension value with time. Therefore although approximate plateaus were observed for the two samples prepared, the individual values differed due to different sample ages at the time of surface tension measurements. This drift in surface tension values has tentatively been attributed to loss of test item from aqueous solution through volatilization, as measurements are required from samples in an open vessel. This was not considered to impact on the integrity of the values achieved as such a process, i.e. volatilization from a body of water, would expect to be replicated on accidental release in the environment.

According to criteria mentioned in Method A5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active. The test item was therefore considered to be not surface-active.