9-Anthracenecarboxylic acid, (triethoxysilyl)methyl ester

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2002-12-10 to 2002-12-09

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

1992

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed, 2002-07-09

Type of method:

ring method

Specific details on test material used for the study:

- Storage condition of test material: In the freezer protected from light, under nitrogen
- Treatment of test material prior to testing: part of TESAC was crushed prior to use

Surface tension:

73.3 mN/m

Temp.:

20 °C

Conc.:

90 vol%

Determination	Time expired [min]	Surface tension [mN/m]
		measured	mean not corrected	mean corrected for calibration	mean corrected using Harkins & Jordan, 1930
1	27	71.0	71.0	73.3	73.3
2	28	70.9
3	29	71.0
4	30	71.0
5	31	71.0

The surface tension of a 90 % saturated solution of TESAC in water is 73.3 mN/m. Based on the criteria as outlined in the guideline, it is concluded that TESAC should not be regarded as a surface active material.

Conclusions:

The surface tension of a 90 % saturated solution of the test substance in water is 73.3 mN/m. Based on the criteria as outlined in the guideline, it is concluded that the test substance is not a surface active material (surface tension > 60 mN/m).

Reference 2

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 water solubility is below 1 mg/L at 20°C

Description of key information

The surface tension of a 90 % saturated solution of the test substance in water is 73.3 mN/m. Based on the criteria as outlined in the guideline, it is concluded that the test substance is not a surface active material (surface tension > 60 mN/m).

Additional information

According to REGULATION (EC) No 1907/2006, Annex VII, Section 7, Column 2, the test does not need to be conducted if the water solubility is below 1 mg/L at 20 °C.

According to the Guidance on Information Requirements and Chemical Safety Assessment, Chapter R.7a: Endpoint specific guidance, Version 6.0 (July 2017), R.7.1.6.3, surface tension measurements require a test material that is [...] soluble in water at concentrations of > 1 mg/L (the test substance has a water solubility of < 2 µg/L).

Furthermore, according to the definition (R.7.1.6.2) of a surface active substance (surfactant): "Any organic substance and/or preparation [mixture] used in detergents, which has surface-active properties and which consists of one or more hydrophilic and one or more hydrophobic groups of such a nature and size that it is capable of reducing the surface tension of water, and of forming spreading or adsorption monolayers at the water-air interface, and of forming emulsions and/or microemulsions and/or micelles, and of adsorption at water-solid interfaces’, it can be concluded, that the test substance should not be tested and should not be regarded as a surface active material.