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Surface tension

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surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
according to guideline
EU Method A.5 (Surface Tension)
equivalent or similar to guideline
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
Surface tension:
23.3 mN/m
23 °C
1 g/L

Water calibration:

Temp. = 24 °C, σ = 0.997 g/cm³.

Surface tension of purified water was determined by the arithmetic mean of six measurements, which is 71.4 mN/m (theoretical value is 72.0 mN/m, therefore correction factor is 1.0084).


Two solutions were tested six times:

First solution: c = 1.001 g/L, temp. = 23 °C, σ = 0.997 g/cm³, age of solution = 143 min.

Arithmetic mean of six measurements is 23.3 mN/m, standard deviation is 0.5 mN/m.


Second solution: c = 1.004 g/L, temp. = 23 °C, σ = 0.997 g/cm³, age of solution = 151 min.

Arithmetic mean of six measurements is 22.9 mN/m, standard deviation is 1.1 mN/m.


Arithmetic mean of two test solution is 23.1 mN/m (± 0.28 mN/m)

Arithmetic mean corrected by calibration factor determined via water calibration is 23.3 mN/m.

Description of key information

The surface tension is 23.3 mN/m (c = 1 g/l) at 23 °C (EU A.5., similar to OECD 115).

Key value for chemical safety assessment

Surface tension:
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The value for surface tension is taken from study report.