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Physical & Chemical properties

Surface tension

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Endpoint:
surface tension
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because based on structure, surface activity is not expected or cannot be predicted
the study does not need to be conducted because surface activity is not a desired property of the material
the study does not need to be conducted because water solubility is below 1 mg/L at 20°C
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
According to REACh Annex VII / column 2, the study needs only to be conducted if based on structure, surface activity is expected or can be predicted.
The present substance is not intended to be used as a surfactant (i.e. not a desired property), and it does not contain typical groups (such as distinct polar and non-polar parts) indicating that it will have significant surface active properties in solution. Moreover, as presented under IUCLID section 4.8, the water solubility is expected below 1 mg/L.
Reason / purpose for cross-reference:
data waiving: supporting information
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
from 2014 08 19 to 2014 08 20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. The substance is considered to be adequately characterised. Therefore full validation applies.
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
according to guideline
Guideline:
other: ISO 304-1985
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected on June 3 to 5, 2013 / signed on November 5, 2013
Type of method:
OECD harmonised ring method
Key result
Surface tension:
49.4 mN/m
Temp.:
20 °C
Remarks on result:
other: expected 90% saturated solution

After transfer of the test solution into the test vessel 22.0 minutes were needed to reach equilibrium at which 10 successive measurements were successfully achieved.

Measurement
No.

Time**
[min]

Surface Tension***
[mN/m]

Temperature
[°C]

1

1.4

49.51

20.2

2

2.1

49.46

20.1

3

2.7

49.48

20.1

4

3.4

49.48

20.1

5

4.1

49.46

20.2

6

4.8

49.42

20.1

7

5.5

49.39

20.1

8

6.2

49.43

20.1

9

6.8

49.43

20.1

10

7.5

49.42

20.1

Mean

-

49.45

20.12

SD [±]

-

0.03

0.04

**)      Time from start of measurement until end of each measurement

***)     Values already corrected acc. to Harkins & Jordan

Conclusions:
According to EU A5 criteria, as the result is below the threshold value of 60 mN/m, the substance is considered to have surface-active potential under the experimental conditions.
Executive summary:

The surface tension of a 90% saturated solution of the test item in double distilled water was determined according to OECD Guideline 115, with a ring tensiometer.

Ten successive measurements were recorded at a temperature of 20°C.

The result was found to be 49.4 mN/m, with a standard deviation ≤ 0.05 mN/m.

Description of key information

Low potential, considering the water solubility is very low (< 1 mg/L), the structure is not characteristic of a true surfactant, and it is not the intended use of the substance (i.e. not a desired property).

From experimental testing, the surface tension was nevertheless measured below the threshold value of 60 mN/m (49.4 mN/m, at expected 90% saturation and 20°C), according to EU A5 criteria, but the interpretation regarding surface-active potential under the experimental conditions should be taken with caution.

Key value for chemical safety assessment

Additional information

Based on chemical structure, showing no alert, and considering the substance is not intended to be used as a surfactant, and is of very low solubility (<1 mg/L) no further data should be required.

However, a fully reliable experimental study, conducted according to a recognized OECD/EU/ISO method and under GLP, is available, and provided as supporting data. The result was found contradictory to the above assessment. Considering all three exemption criteria are fulfilled, while one is sufficient, the test result is not retained as key value. But the information is useful for qualitative assessment.