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Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

06/23/2020

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:

adopted on 27 July 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

not specified

Type of method:

ring method

Key result

Surface tension:

61.5 mN/m

Temp.:

20 °C

Conc.:

0.1 g/L

	First run	Second run
Number of measurements	12	11
Total measuring time [s]	333.93	307.65
Measuring time of the last 10 measurements [min:s]	227.49	267.36
Measurement 1	60.28	62.96
Measurement 2	60.21	62.90
Measurement 3	60.17	62.86
Measurement 4	60.12	62.81
Measurement 5	60.09	62.79
Measurement 6	60.09	62.77
Measurement 7	60.05	62.78
Measurement 8	60.06	62.77
Measurement 9	60.05	62.74
Measurement 10	60.03	62.74
Surface tension [mN/m] (Mean value of the last ten measurements)	60.12	62.81
Mean value [mN/m]	61.5

Conclusions:

Surface tension (at 20 °C): 61.5 mN/m (at 0.1 g/l)

Executive summary:

The surface tension of MDEA-Esterquat C18 unsatd. was determined according to OECD guideline 115 and EU method A.5 using the ring method. The surface tension was determiend to be 61.5 mN/m (at 0.1 g/l, 20°C).

 

 

Description of key information

61.5 mN/m at 0.1 g/l, 20°C (OECD TG115/EU method A.5; ring method)

Key value for chemical safety assessment

Surface tension:

61.5

in mN/m at 20°C and concentration in mg/L:

100

Additional information

The surface tension of MDEA-Esterquat C18 unsatd. was determined according to OECD guideline 115 and EU method A.5 using the ring method. The surface tension was determined to be 61.5 mN/m (at 0.1 g/l, 20°C).

Substances showing a surface tension lower than 60 mN/m should be regarded as being surface-active materials. Based on the results, the test substances would not be considered as being surface active. However, this result is not in line with the expected surface tension behaviour of the substances. Cationic surfactants carrying two C18 alkyl chains, such as the present substances, are designed to possess surface active properties and typically exhibit lower surface tension value, like e.g. the liquid source substance MDIPA Esterquat C18 unsatd. (37.5 mN/m at 20°C). Therefore, due to the intrinsic properties (crystallisation) of this double-chain cationic amphiphiles at temperatures below the melting point no reliable results were obtained using the ring method. At temperatures of 20 °C, the inner-molecular mobility of the fatty acid C-chains is hindered. Corresponding to this hinderance, on the one hand, the time to reach solubilisation equilibrium is long and on the other hand, there is a tendency to form vesicles. This can be seen i.e. at the test on hydrolysis with low correlation rates for pseudo-first order curve determination for 20°C but high correlation rates at 50 and 60°C.