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Surface tension

Link to relevant study record(s)

Reference

Reference 1

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

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACh Annex VII, 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. Therefore, the study is deemed unnecessary.

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

17-18 December 2014

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

The study was conducted according to an internationally recognised method, and under GLP. But test concentration is expected to differ from requirements. The substance is considered to be adequately characterised with its purity. Therefore validation applies with restrictions.

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

expected test concentration

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

- Storage condition of test material: In refrigerator (2-8°C) protected from light, container flushed with nitrogen
- Stability at higher temperatures: Yes, maximum temperature: 40°C, maximum duration: 10 days

Key result

Surface tension:

44.3 mN/m

Temp.:

20 °C

Remarks on result:

other: concentration expected <90% of the test substance saturation solubility (i.e. < 0.6 g/L)

Table 4.10/2: Surface tension of the test substance

 

Measurement	Time passed after transfer test solution to test vessel [minutes]	Surface tension [mN/m]
		individual	mean	mean multiplied by Φb and Harkins-Jordan corrected value
1	15	44.7	44.6	44.3
2	16	44.5
3	17	44.6
4	18	44.6
5	19	44.7

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 the test substance was measured under GLP according to OECD 115/EU A5 guidelines, using the OECD harmonized ring method.

The apparatus was calibrated with water. Readings were recorded on a test solution with concentration expected to be < 90% saturation.

The mean of five consistent values was corrected with calibration and H&J factors.

The surface tension of the test solution (< 600 mg/L) at 20 °C was 44.3 mN/m.

Description of key information

Surface tension = 44.3 mN/m (concentration expected < 600 mg/L, and at 20°C)

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.

Additional information

Based on chemical structure, showing no alert, and considering the substance is not intended to be used as a surfactant, no further data should be required.

However, an experimental study, conducted according to a recognized OECD/EC method and under GLP, is available, and provided as supporting data. The result was found contradictory to the above assessment. Testing conditions (concentration of solution) did not comply with guideline requirements, so the result is not retained as key value. However the information is useful for qualitative assessment.