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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:
2008-09-09 to 2008-09-11
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to a method recommended in international standards. The substance is considered to be adequately characterised with its purity. However, concentration is unclear. Therefore validation applies, but with restrictions.
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes (incl. certificate)
Remarks:
Inspected on 05th to 06th and 26th to 30th November 2007 / Decision 30 April 2008 / Signed on 12th November 2008
Type of method:
OECD harmonised ring method
Key result
Surface tension:
59.3 mN/m
Temp.:
20.2 °C
Conc.:
1.69 mg/L

Water (calibration)

Temperature = 20.2°C

(sigma)0 = 72.72 mN/m (literature)

(sigma)g = 71.92 mN/m (mean of 6 measurements)

--> calibration factor (phy)b = 1.0112

Test item

First sample: 59.6 mN/m (mean of 6 measurements)

Second sample: 59.48 mN/m (mean of 6 measurements)

Mean corrected value from both samples = 59.3 mN/m

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, ring method, at 90% of the saturation solubility.

Two replicates were performed at 20°C, and the mean of the consistent values was corrected with calibration factor from water, and Harkins-Jordan table.

The surface tension of the test substance is 59.3 mN/m, at ca 1.7 mg/L and 20°C.

Description of key information

Surface tension = 59.3 mN/m, at 90% saturation expected (i.e. ca 1,7 mg/L), and 20.2°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.

Key value for chemical safety assessment

Surface tension:
59.3

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available. Despite restrictions on actual concentration tested, it is considered as a key study, and the result is retained as key value for purpose of CSA.