7,7,9(or 7,9,9)-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diazahexadecane-1,16-diyl bismethacrylate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

30 Jul 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

adopted in 1981

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

adopted in 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany

Type of method:

plate method

Specific details on test material used for the study:

Storage conditions: room temperature (20 ± 5 °C), keep away from light

Surface tension:

52.09 mN/m

Temp.:

20 °C

Conc.:

90 other: 90% of maximum water solubility

Results
Reference Study
Water was measured, the results are shown in Table1.

Table 1 – Negative control measured values, temperature of 27.7 °C at each measurement.

Measurement no	Time [s]	Mass [g]	Surface tension [mN/m]
1	3	0.2934	71.57
2	6	0.2925	71.35
3	9	0.2925	71.35
4	12	0.2924	71.33
5	15	0.2923	71.31
6	18	0.2925	71.35
7	21	0.2924	71.33
8	24	0.2926	71.38
9	26.9	0.2926	71.38
10	30	0.2925	71.35
Mean Standard deviation			71.37
			0.07

 

Main Study
The test item solution was kept at a constant temperature (20.0 ± 0.5 °C). After the first measurement series, a second one was carried out for verification purposes. Tables 2 and 3 show the results.

Table 2 – Test item first series measurement values

Measurement no	Time [s]	Mass [g]	Surface tension [mN/m]	Temperature [°C]
1	2.9	0.2132	52.01	20.2
2	5.9	0.2138	52.16	20.3
3	8.9	0.2137	52.13	20.3
4	11.9	0.2137	52.13	20.3
5	14.9	0.2129	51.94	20.3
6	17.9	0.2135	52.08	20.4
7	20.9	0.2137	52.13	20.4
8	23.9	0.2138	52.16	20.4
9	26.9	0.2137	52.13	20.5
10	29.9	0.2135	52.08	20.5
Mean Standard deviation			52.09
			0.07

 

Table 3 – Test item second series measurement values

Measurement no	Time [s]	Mass [g]	Surface tension [mN/m]	Temperature [°C]
1	2.9	0.2157	52.62	19.8
2	5.8	0.214	52.20	19.8
3	8.9	0.2143	52.28	19.9
4	11.8	0.2137	52.13	19.9
5	14.9	0.2136	52.11	19.9
6	17.8	0.2141	52.23	19.9
7	20.9	0.214	52.20	19.9
8	23.8	0.2138	52.16	19.9
9	26.9	0.214	52.20	19.9
10	29.9	0.2136	52.11	20.0
Mean Standard deviation			52.22
			0.15

 

No significant changes and no significant dependence on time and temperature were noticed. Regarding time and temperature dependence, values between 51.94 and 52.28 mN/m were recorded showing no significant variations.

Discussion
The literature value of the surface tension of water at 28 °C is 71.52 mN/m (according to Vargaftik et al., “International Tables of the surface tension of water”, J. Phys. Chem. Ref. Data 12, 817, 1983). The surface tension of the negative control showed a 0.25% difference from the stated literature value, which lies within the accepted range of 1% deviation from the literature value. Single determination values show no significant difference (0.65% between the highest and lowest value of both measurement series). All measured values lay below the threshold for surface tension stated in the guidelines.

Conclusion
The surface tension of an aqueous solution of test item was determined to be 52.09 ± 0.07 mN/m at 20 ± 0.5 °C. The test item result is considered valid and the test item is classified as surface active. Because the measured value is < 60 mN/m.

Description of key information

52.09 mN/m at 20° C and 90% vol.% (OECD 115, tensiometer). The substance is surface active.

Key value for chemical safety assessment

Surface tension:

52.09

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

10.161