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Surface tension

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surface tension
Type of information:
experimental study
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
according to guideline
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Specific details on test material used for the study:
Name of test material (as cited in study report): 1-chloro-4-(prop-2-ynoxymethyl)benzene
Analytical purity: 97.9 area %. (by GC)
Impurities (identity and concentrations): < 0.1 g/100 g water
Lot/batch No.: Op 2/14
Expiration date of the lot/batch: 04. Sep 2014
Storage condition of test material: ambient temperature
Surface tension:
62 mN/m
20 °C
Remarks on result:
other: The test item was not surface-active.

Results in detail

Reference measurement with purified water

σ[mN/m]. 72.324

The surface tension of an aqueous preparation of the test item (90 % saturation concentration) at 20 °C was found to be in the

range between 62 mN/m and 66 mN/m.

In these experiments, no stable equilibrium state could be found within 6 hours. After a decrease by about 1 mN/m within the first

21 ± 5 minutes, the values increased steadily over the total measuring time of about 6 hours. Therefore, no definitive value for the surface tension can be given.

Surface tension [mN/m]




First value



Minimum value



Last value



As the whole range of the curve over time in both determinations was above 60 mN/m, the statement can be made, that the test item was not surface active.

Several measurements had been performed with the plate method.

They showed much lower values, a still strenger increase with time and a worse reproducibility. Additionally, the plate was not wetted with the liquid, when the plate was removed after the experiments.

Therefore, these experiments were discarded.

Description of key information

The surface tension of an aqueous preparation of the test item(90 % saturation concentration) at 20 °C was found to be above 
62 mN/m with a distinct increase within 6 hours.
The test item was not surface-active.

Key value for chemical safety assessment

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

Additional information

A GLP study was conducted in accordance with the OECD Guideline for the Testing of Chemicals. 15 „Surface Tension of Aqueous Solutions" using the force which is required to withdraw a vertically suspended ring from the surface of the solution is measured. Additionally, measurements with the plate method were performed, but discarded.

BASF GLP study no. 15L00408 determined the surface tension of an aqueous preparation of the test item (90 % saturation concentration) at 20 °C to be 62 mN/m. The preparation of test item is not surface-active.