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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
April - May 1997
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study according to GLP. Composition known.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not appl icable to the apparatus used. This deviation has been considered not to have affected the integrity of the study.
Principles of method if other than guideline:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not appl icable to the apparatus used.
This deviation has been considered not to have affected the integrity of the study.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Surface tension:
70.9 mN/m
Temp.:
21.5 °C
Conc.:
15.1 mg/L

Sample solution concentration

The mean total peak areas relating to the standard and sample solutions are shown in Table 5.2, see below.

 

Calibration factor(Ф)

The readings, temperatures and the corresponding calibration factors of the glass double-distilled water are shown in Table 5.3, see below.

 

Sample solution readings

The readings, times and temperatures of the sample solution are shown in Table 5.4.

 

Table 5.4 

Time (mins)

Reading(mN/m)

Temperature (°C)

5

70.5

21.5

16

70.7

21.5

25

70.5

21.5

38

70.5

21.5

52

70.7

21.5

Mean reading = 70.58 mN/m

 

Surface tension = reading x calibration factor = 70.58 x 1.005 = 70.9 mN/m

Temperature 21.5 ± 0.5°C

Conclusions:
A solution of 15.1 mg/L of 44% 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates has a surface tension of 70.9 mN/m. Based on the criteria as outlined in the EEC guideline, it was concluded that 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates should not be regarded as a surface active material.
Executive summary:

For REACH this endpoint could have been waived. According to ECHA Guidance on information requirements and chemical safety assessment. Chapter R.7a: Endpoint specific guidance p 78: The study needs only to be conducted if: based on structure, surface activity is expected or can be predicted; or surface activity is a desired property of the material. No surface active properties are expected, because of the absence of both a hydrophilic headgroup and a hydrophobic tail in the structure.

A solution of 15.1 mg/L of 44% 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates has a surface tension of 70.9 mN/m. Based on the criteria as outlined in the EEC guideline, it was concluded that 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates should not be regarded as a surface active material.

Description of key information

A solution of 15.1 mg/L of 44% 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates has a surface tension of 70.9 mN/m. Based on the criteria as outlined in the EEC guideline, it was concluded that 3,6,9-Triethyl-3,6,9-trimethyl-l ,4,7- triperoxonane, 55% Petroleum distillates should not be regarded as a surface active material.

Key value for chemical safety assessment

Surface tension:
70.9
in mN/m at 20°C and concentration in mg/L:
15.1

Additional information