Registration Dossier
Registration Dossier
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EC number: 424-510-1 | CAS number: 220150-59-4
Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
Surface tension 72.3 mN/m at 21.1 °C ± 0.5 °C and at 1 g/l
Key value for chemical safety assessment
Additional information
The surface tension of the test item was evaluated in an experimental study according to the OECD Guideline 115 (1981) and the EU Method A.5 (1992). 96.8 mg of test item was dissolved in 100 ml of double distilled water to obtain an aqueous solution which was subsequently put into a measurement vessel on a mobile sample table. The table was raised until the ring was immersed below the surface of the solution, then lowered until the ring touched the liquid surface. After some additional lowering of the table, the ring exerted a torque on the force measuring system. This torque was compensated by turning the large knob on the force measuring system clockwise. Lowering of the table and subsequent compensation of the resulting torque were continued in small increments until the lamina broke. This was when upward force completely overcame the surface tension force and the ring was torn away from the surface. The surface tension was recorded at that point. After completing the measurement, the ring was immersed below the surface again and the measurement was repeated until a constant value was reached. The time taken for the solution to be transferred to the vessel was recorded for each determination (9 recordings).
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