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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:
2008-10-21 - 2008-12-09
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
yes (incl. QA statement)
Type of method:
plate method
Key result
Surface tension:
63.26 mN/m
20 °C
1 g/L
The surface tension of an aqueous solution of 3-Methylpyrazol was determined. In the first measurement series, a mean value of 65.32 mN/m at 20.0 °C was found. In a verification experiment (90 minutes later), a significant change was observed. Therefore, further measurement series were performed until equilibrium was reached. In the equilibrium, a value of 63.26 mN/m was measured.

As both values were higher than 60 mN/m 3-Methylpyrazol is classified as

not surface active. The surface tension of the reference item lay within the accepted range.
Executive summary:

The influence on surface tension was measured using an aqueous solution of the test item containing 1 g/L. A value above 60 mN/m was measured at the start, but a verification measurement after 90 minutes showed a much lower value. Therefore further measurements were performed until the surface tension of the solution reached equilibrium (difference between the last two measurement series lies below 5%). At the equilibrium again a value above 60 mN/m was found. No explanation was found for the reversible decrease in surface tension, but the graph shows that equilibrium lies close to the value of the first measurement. The surface tension of the reference item was determined with a difference of 0.40% resp. 0.25% from the stated literature value. Therefore the test is considered valid.

Description of key information

The surface tension of 3-Methylpyrazol was measured as 63.26 mN/m.

Key value for chemical safety assessment

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

Additional information

The reported study is GLP compliant and has Klimisch score 1. The surface tension of 3-Methylpyrazol was measured as 63.26 mN/m.