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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013-10-23 - 2013-10-24
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes
Type of method:
ring method
Specific details on test material used for the study:
- Name of test material (as cited in study report): Dimethyl Piperazine
- Substance type: Clear liquid
- Physical state: Liquid
- Lot/batch No.: 1903-3/2012
Key result
Surface tension:
70.7 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: The surface tension result is corrected for water calibration. The water solubility was determined to be > 1 g/L.

Calibration:

The measured value of the surface tension of water: 71.3 mN/m

EC standard reading for surface tension of water: 72.75 mN/m

Calibration factor is: 72.75/71.3 = 1.020

The duplicate runs provided following value: 70.7 mN/m

After the 60 minute check on Run 2 the sample beaker was sealed and left over night to ensure that there was no change to the solution over time. The test at 960 minutes (16 hours) confirms that no changes occur over time.

Conclusions:
The surface tension of the substance was determined to be 70.7 mN/m at a test concentration of 1 g/L and at 20°C. The substance is concluded not to have surface active properties.

Description of key information

The surface tension of the test substance was determined in a GLP study according to test method EC A.5, to be 70.7 mN/m at a test concentration of 1 g/L and at 20 °C, following the ring method (Younis, 2013).

Key value for chemical safety assessment

Surface tension:
70.7
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The substance is concluded not to have surface active properties.