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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 2011-02-15 to 2011-02-16 (experimental phase)
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted according to a relevant guideline without deviations. It was not carried out according to GLP, but it was performed in a test facility which has been certified to be in compliance with the principles of GLP.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
from May 30, 2008
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
adopted July 27, 1995
Deviations:
no
GLP compliance:
no
Remarks:
However, the study was performed in a test facility which has been certified to be in compliance with the principles of GLP.
Type of method:
OECD harmonised ring method
Surface tension:
66.2 mN/m
Temp.:
19.7 °C
Conc.:
90 vol%
Remarks on result:
other: surface tension of test substance in water (90% of saturation concentration)

Calibration factor

The calibration factor Φbwas determined to be 1.0214 for double distilled water.

Determination of Surface Tension for the Test Item

Time expired [hours:min]

Temperature

[°C]

Surface tension

[mN/m]

Measured

[mN/m]

mean value

calculated from

the bold values

(σ*)

mean value

corrected for

calibration

(σ1 = σ* · Φb)

σ1 corrected for

Harkins-

Jordan

(σ = σ1 · Fc)

First sample

0:33

19.6

65.8

65.67

67.07

66.68

0:34

19.6

65.7

0:35

19.7

65.7

0:36

19.7

65.6

0:37

19.7

65.6

0:38

19.7

65.6

Second sample

0.36

19.7

64.9

64.83

66.22

65.72

0.37

19.7

64.9

0.38

19.7

64.9

0.39

19.7

64.8

0.40

19.7

64.8

0.41

19.8

64.7

Mean value from both samples:

66.2

Fc: factor for correction acc. to Harkins-Jordan. Fc=0.994 for 67.07 mN/m and Fc=0.992 for 66.22 mN/m

Conclusions:
The surface tension of the test item in water (90% of saturation concentration) was determined to be 66.2 mN/m at 19.7 °C ± 0.1 °C. The study is considered to be adequate and reliable.

Executive summary:

The determination of the surface tension of an aqueous solution of the test item was based on the OECD Guideline No. 115: “Surface Tension of Aqueous Solutions” (1995).

The surface tension of test item in water (90% of saturation concentration) was determined according to the ring method to be 66.2 mN/m at 19.7 °C ± 0.1 °C. The study is considered to be adequate and reliable. As the reported surface tension of the test substance is >60mN/m then the test substance should not be considered to be surface active (according to EU method 5).

Description of key information

66.2 mN/m at 19.7 °C ± 0.1 °C, OECD 115, OECD harmonised ring method, Kühne 2011

Key value for chemical safety assessment

Surface tension:
66.2

Additional information

Only a single study conducted according to guidelines is available for this endpoint. The study is considered to be relevant, reliable (Klimisch 1) and adequate for the purposes of risk assessment, classification and labelling. As the recorded value is >60mN/m then the test substance is not considered to be surface active.