1,6-Hexanediamine, N1,N6-bis(1,2,2-trimethylpropyl)-

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Followed guideline and GLP requirements; Surface tension was not corrected using Harkins-Jordan correction table as the correction is not needed for the apparatus tested. Once calibrated, the ring and balance assembly used gave a direct reading for surface tension that was within the required accuracy (+/- 0.5 mN/m)

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

Surface tension was not corrected using Harkins-Jordan correction table as the correction is not needed for the apparatus tested.

Qualifier:

according to guideline

Guideline:

other: ISO 304 Ring Method

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Surface tension:

ca. 59.6 mN/m

Temp.:

22.6 °C

Conc.:

0.092 g/L

Remarks on result:

other: Test article considered to be surface-active

Readings, times and temperatures for Sample Analysis

Time (minutes)	Reading (mN/m)	Temperature (degrees C)
174	57.0	22.6
179	59.0	22.6
187	59.5	22.6
193	59.5	22.6
200	59.5	22.6
209	59.5	22.6

Mean reading:         59.5 mN/m (last 4 readings)

Surface tension = reading x calibration factor

                        = 59.5 x 1.0002 = 59.6 mN/m

Temperature:   = 22.6 +/- 0.5 degrees C

pH of sample solution = 9.4

Test items giving a solution surface tension of lower than 60 mN/m are interpreted as being surface-active by Method A5. Using SPARC v. 4.5, the test item gave calculated pKa's of 9.98 and 10.81; therefore the test item would be ionized at the pH of the test solution. thus, since the ionized test item has a typical surfactant strucute ie polar head attached to a carbon chain, the test item was expected to be surface-active.

Conclusions:

A ring test yielded a value of 59.6 mN/m (9.25 x 10-2 g/l) at 22.6 +/- 0.5 degrees C for the test article. The test article was considered to be surface active by definition of Method EC A5, and based on it’s chemical structure. 

Executive summary:

A test using a ring method based on ISO 304, designed to be compatible with Method A5 “Surface Tension” of Commission Regulation (EC) No. 440/2008 yielded a value of 59.6 mN/m (9.25 x 10-2 g/l) at 22.6 +/- 0.5 degrees C for the test article. The test article was considered to be surface active by definition of Method EC A5, and based on it’s chemical structure. 

Test items giving a solution surface tension of lower than 60 mN/m are interpreted as being surface-active by Method A5. Using SPARC v. 4.5, the test item gave calculated pKa's of 9.98 and 10.81; therefore the test item would be ionized at the pH of the test solution. Thus, since the ionized test item has a typical surfactant structure ie polar head attached to a carbon chain, the test item was expected to be surface-active.

Description of key information

A test using a ring method based on ISO 304, designed to be compatible with Method A5 “Surface Tension” of Commission Regulation (EC) No. 440/2008 yielded a value of 59.6 mN/m (9.25 x 10-2 g/l) at 22.6 +/- 0.5 degrees C for the test article. The test article was considered to be surface active by the strict definition of Method EC A5 (<60 mN/m), and based on it’s chemical structure. 
Moreover, using SPARC v. 4.5, the test item gave calculated pKa's of 9.98 and 10.81; therefore the test item would be ionized at the pH of the test solution. Thus, since the ionized test item has a typical surfactant structure (ie. polar head attached to a carbon chain), the test item was expected to be surface-active.

Key value for chemical safety assessment

Surface tension:

59.6

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

92.5