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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key 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 OECD/EU/ISO guideline, and under GLP. No deviation was reported. The substance is considered to be adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
according to
Guideline:
other: ISO 304-1985
Qualifier:
according to
Guideline:
other: DIN 53914
Principles of method if other than guideline:
(not applicable)
GLP compliance:
yes (incl. certificate)
Remarks:
inspected on June 3 to 5, 2013 / signed on November 5, 2013
Type of method:
OECD harmonised ring method
Key result
Surface tension:
ca. 45.6 mN/m
Temp.:
20 °C
Remarks on result:
other: expected 90% saturated solution

After transfer of the test solution into the test vessel, 68.2 minutes were needed to reach equilibrium at which 10 successive measurements were successfully achieved with a SD of 0.05 mN/m.

Measurement
No.

Time**
[min]

Surface Tension***
[mN/m]

Temperature
[°C]

1

62.0

45.52

20.0

2

62.7

45.63

20.0

3

63.4

45.68

20.0

4

64.1

45.63

20.0

5

64.8

45.62

20.1

6

65.5

45.64

20.0

7

66.2

45.66

20.1

8

66.8

45.65

20.1

9

67.5

45.67

20.1

10

68.2

45.69

20.1

Mean

-

45.64

20.05

SD [±]

-

0.05

0.05

**)      Time from transfer of the test solution 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 in ten successive measurements with a standard deviation ≤ 0.05 mN/m at a temperature of 20°C.

The result was found to be 45.6 mN/m.

Description of key information

Surface tension = 45.6 mN/m, at expected 90% saturated solution

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. However, since 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), this conclusion should be taken with caution.

Key value for chemical safety assessment

Surface tension:
45.6

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EU/ISO method and under GLP, is available. Therefore, it is considered as a key study, and the result is retained as key value.