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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:
2015-07-23
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
OECD harmonised ring method
Surface tension:
30.48 mN/m
Temp.:
20.3 °C
Conc.:
1 g/L

The surface tension of the reference item n-heptane was determined on 2015-03-12 as 20.05 ± 0.01 mN/m (20 °C) and is within the acceptable range of 20.23 ± 0.22 mN/m.

The temperature of the test solution during the whole measurements was between 20.1 and 20.3 °C.

Conclusions:
The surface tension of a 1 g/L aqueous solution of the test item Amphopropionate C12-18 at 20°C was determined to be: 30.48 mN/m (standard deviation ± 0.05 mN/m). Due to the fact that the surface tension is < 60 mN/m, the test item is classified as surface-active substance.
Executive summary:

The surface tension of Amphopropionate C12 -18 (water content 59.7%) was determined according to OECD Guideline 115 (27 July 1995) and EU Method A.5 by the OECD harmonized ring method. The mean surface tension of an aqueous test substance solution at 20°C at a concentration of 1 g/L, was determined to be 30.48 mN/m. Therefore Amphopropionate C12 -18 is considered to be surface active.

Description of key information

30.48 mN/m at 20°C and 1g/L (OECD TG 115 / EU method A.5, ring method; RL1; GLP)

Key value for chemical safety assessment

Surface tension:
30.48
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of Amphopropionate C12 -18 (water content 59.7%) was determined according to OECD Guideline 115 (27 July 1995) and EU Method A.5 by the OECD harmonized ring method. The mean surface tension of an aqueous test substance solution at 20°C at a concentration of 1 g/L, was determined to be 30.48 mN/m. Therefore Amphopropionate C12 -18 is considered to be surface active.