Betaines, C12-16 (even numbered) -alkyldimethyl

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 November - 18 December 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes

Type of method:

ring method

Surface tension:

31.9 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Results of water calibration: Correction factor for the instrument is 1.0084

First test solution: c= 99.1 mg/L, T = 20 deg C, p = 0.998 g/cm3, age of solution = 133 min.

Repeat	Surface tension (mN/m)
1	31.7
2	31.6
3	31.6
4	31.6
5	31.5
6	31.7
Arithmetic mean	31.6
standard deviation	0.1

Second test solution: c= 100.0 mg/L, T= 20 deg C, p = 0.998 g/cm3, age of solution = 216 min

Repeat	Surface tension (mN/m)
1	31.7
2	31.7
3	31.7
4	31.6
5	31.6
6	31.7
Arithmetic mean	31.7
standard deviation	0.1

Surface tension (arithmetic mean of two test solutions) = 31.7 mN/m (+/- 0.1 mN/m)

Surface tension (corrected by calibration factor) = 31.9 mN/m

Conclusions:

The test item has a surface tension of 31.9 mN/m at 1 g/L

Executive summary:

The surface tension of the test item was determined according to EU Method A.5 (ring method). The surface tension was 31.9 mN/m at 1 g/L.

Description of key information

The surface tension of the test item was determined according to EU Method A.5 (ring method). The surface tension was 31.9 mN/m at 1 g/L.

Key value for chemical safety assessment

Surface tension:

31.9

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

1 000