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Physical & Chemical properties

Surface tension

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surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From October 18, 2017 to November 22, 2017
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
according to guideline
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
according to guideline
EU Method A.5 (Surface Tension)
GLP compliance:
The study was conducted in a facility which operates in accordance with Good Laboratory Practice principles; however no claim of GLP compliance was intended nor is made for this study
Type of method:
ring method
Key result
Surface tension:
ca. 30 mN/m
20 °C
1 g/L

Due to the complex nature and composition of the test item, it was considered not completely applicable to follow the EC A.5 and OECD 115 guidelines with regard to sample preparation. Therefore, the surface tension of a nominally 1 g/L dispersion of test item in water was used as a worst case scenario based on the maximum sample concentration specified in the guidelines. According to criteria stated in EC Method A.5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active., i

Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 30.0 ± 0.5 mN/m at 20 ± 0.5ºC; therefore it is surface-active.
Executive summary:

A study was conducted to determine the surface tension of the test substance, C10-12 and C18-unsatd. DEA, using ring method, according to the OECD Guideline 115 and EU Method A.5. Under the conditions of the study, the surface tension at nominally 1 g/L of test substance in water was determined to be 30.0 ± 0.5 mN/m at 20 ± 0.5ºC. Therefore, the test substance was considered to be surface-active (Envigo, 2018).

Description of key information

The surface tension of the test substance was determined using the ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:
in mN/m at 20°C and concentration in mg/L:

Additional information

(surface active)