Registration Dossier
Registration Dossier
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EC number: 212-141-7 | CAS number: 765-14-0
Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
The surface tension of an aqueous preparation of the substance (90% saturation concentration) at 20 °C was found to be 63 mN/m. Thus, the substance is not surface-active.
Key value for chemical safety assessment
- Surface tension:
- 63
Additional information
To determine the surface tension of the test substance, a test according to OECD Guideline for the Testing of Chemicals 115 was carried out. In principle, the force which is required to withdraw a vertically suspended plate from the surface of the solution measured. About 0.25 g of the test item and about 250 g (249.75 g - 249.97 g) purified water were weighed into an Erlenmeyer flask. The solution was agitated and stirred on a magnetic stirrer. The test item was not dissolved completely. The saturated solution was transferred into a separating funnel. After that, the lower aqueous phase was taken. 10 mL of purified water were filled up to 100 mL with the aqueous phase and tempered at 20 °C. The surface tension of the resulting solution (90% saturation concentration) was measured. The solution was poured in the cleaned and with solution rinsed vessel, which was put into the termostat-controlled tensiometer. After inserting the freshly heated platinum plate at the quick connector of the force sensor, the measurement of the test item was started. The temperature of the test item solution was checked after the measurement. The surface tension of the purified water used was also measured for reference. The measurement of the surface tension finished automatically when the standard deviation of the last sixty measuring points (sampling rate of two measuring points per minute) was less than 0.05 mN/m. Otherwise the measurement duration lasted 6 h. The mean of the last sixty measuring points equates to the result of the measurement. In result, the surface tension of an aqueous preparation of the test substance (90% saturation concentration) at 20 °C was found to be 63 mN/m. Thus, the substance is not surface-active.
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