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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:
30 March 2020 to 29 April 2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2016
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Date of Inspection: 10-17 December 2019; Date of Signature on Certificate: 24 February 2020
Type of method:
OECD harmonised ring method
Key result
Surface tension:
57.75 mN/m
Temp.:
20 °C
Conc.:
1 g/L

The results of the test on the determination of the surface tension of the test solution are given in Table 1. The individual measurements were obtained with a coefficient of variation of < 0.2 mN/m.


Table 1           
Surface Tension of the Test Item



















































Measurement



Time passed after measurement start
[seconds]



Surface tension
(mN/m)



individual σ multiplied by


Harkins-Jordan corrected value



mean σ


 



1



40.46



58.43



57.75



2



66.64



58.00



 



3



92.78



57.83



 



4



118.52



57.73



 



5



145.32



57.64



 



6



172.32



57.57



 



1        Mean calculated from measurements 2 to 6, after equilibrium was reached.

Conclusions:
The surface tension of a test solution at a concentration of 1 g/L in water and at 20°C was 57.75 mN/m.
Executive summary:

The OECD harmonized ring method was applied for the determination of the surface tension of the test item.


The surface tension of a test solution at a concentration of 1 g/L in water and at 20°C was 57.75 mN/m. Because the surface tension was < 60 mN/m, the test item is considered to be surface active.

Description of key information

57.75 mN/m at 20°C for a 1 g/L solution in water; OECD 115; Jovic Madzarevic, Z. (2020)

Key value for chemical safety assessment

Surface tension:
57.75
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

As the surface tension was < 60 mN/m, the test item is considered to meet the criteria for surface activity. However, the CMC study (IUCLID Section 4.8) indicates that the substance does not behave as a true surfactant.

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