Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
02/12/2008 to 17/02/2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in accordance with recognised guideline

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
(see below)
Principles of method if other than guideline:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the requried accuracy (± 0.5 mN/m); this is a result of the reduced ring dimensions. This deviation has been considered to not have affected the integrity of the study.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Surface tension
Surface tension:
72 mN/m
Temp.:
21.6 °C
Conc.:
0.986 g/L

Any other information on results incl. tables

The calibration factor, by which the measured surface tension of the sample solution is multiplied, was determined using the following equation:

φ = VL/VM

where:

φ = calibration factor

VL= literature value for surface tension of water at test temperature (mN/m)

VM= measured value for surface tension of water at test temperature (mN/m)

The mean calibration factor is 1.003 which gives a surface tension of a 0.986 g/l solution of test material has been determined to be 72.0 mN/m at 21.6 ± 0.5°C. The test material is considered not to be a surface-active material.

Applicant's summary and conclusion

Conclusions:
The surface tension of a 0.986 g/l solution of test material has been determined to be 72.0 mN/m at 21.6 ± 0.5°C. The test material is considered not to be a surface-active material.
Executive summary:

In a determination of general physico-chemical properties study (Harlan project number: 0959/0224) the test material has been determined to be 72.0 mN/m at 21.6 ± 0.5°C. The test material is considered not to be a surface-active material.

The determination was carried out using a White Electrical Institute interfacial tension balance and a procedure based on the ISO 304 ring method. With the exception of the following deviation, the experimental procedure used complied with that specified in Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Substances showing a surface tension lower than 60 mN/m should be regarded as being surface-active.

It is evident from the information obtained in the hydrolysis test and data relating to the pH of the test material in water that negligible hydrolysis of the sample solution occurred during the course of the surface tension test.