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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:
2010-06-08 to 2010-07-28
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to internationally recognised guidelines, and under GLP. No deviation affected the quality of the study.
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to
Guideline:
other: DIN EN 14370
GLP compliance:
yes (incl. certificate)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
69.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Table 1. Measured Surface Tension of Water

Replicate No. Time expired* [min] Temperature [°C] Surface tension of Water
measured [mN/m]
1 0 20,4 72,0
2 15 20,4 72,2
3 30 20,3 72,2
4 45 20,3 72,3
5 60 20,3 72,4
6 75 20,3 72,4
mean value (n=6): 72,3
    SD (n=6): 0,2

Literature value for surface tension of water:       72.8 mN/m

Correction factor = 72.8 / 72.3                       1.007

* time expired since the pure water was transfered into the test vessel

Table 2. Measured Surface Tension of an Aqueous Solution of the Test Item

Replicate No. Time expired* [min] Temperature [°C] Surface tension of Water
measured [mN/m] corrected1 [mN/] corrected2 [mN/]
1 0 20,0 70,9    
2 15 20,0 69,9
3 30 20,1 69,1
4 45 20,1 68,9
5 60 20,2 68,9
6 75 20,2 68,9
mean value (n=4): 69,0 69,5 69,3
    SD (n=4): 0,10    

* time expired since the test item solution was transfered into the test vessel

1corrected for the calibration factor (water) = 1.007

2corrected by Harkins-Jordan regression (y = 0.7232 * x1.0756 )

Rounded values of the constant readings (+/- 0.2 mN/m) were used for the correction

Conclusions:
The substance has no surface activity under the test conditions.
Executive summary:

The study was conducted according to the guidelines into force (ring method), and under GLP. The surface tension of the substance TFE was measured to be 69.3 (+/- 0.1) mN/m at the maximum testing concentration of 1 g/L, and at the temperature of 20°C.

Description of key information

The substance TFE is not considered to be a surface-active agent, according to EC criteria.

Key value for chemical safety assessment

Surface tension:
69.3
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

A fully reliable GLP study was conducted at the maximum testing concentration of 1 g/L, showing only a slight lowering of the surface tension of water.

Two supporting published studies show significant surface active properties for TFE, but applying to higher concentrations than required for testing.