Registration Dossier

Administrative data

Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
22 September 2011 - 4 April 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: According to OECD Guideline 114

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Type of method:
rotational viscometer (dynamic)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Viscosityopen allclose all
Temp.:
other: 30.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
6.55
Temp.:
other: 50.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
4.09

Any other information on results incl. tables

Values are the means from two trials (with 12 runs each). While the standard error of the means (0.015 mPa s at 30°C and 0.027 mPa s at 50°C) indicates good reproducibility, the general experience with the rheometer indicates that the uncertainty of viscosity values is unlikely to be better than ±2.5%. This value, which is larger than the standard error of the mean, has been used as the basis for the uncertainty quoted below.

The best estimates for the dynamic viscosity of the test substance are:

at 30°C: 6.55 ± 0.16 mPa.s

at 50°C: 4.09 ± 0.10 mPa.s

The best estimates for the kinematic viscosity of the test substance are:

at 30 °C: 8.19 ± 0.20 mm2/s

at 50 °C: 5.20 ± 0.13 mm2/s

The test substance shows Newtonian behaviour, i.e. no significant effect of shear rate.

The measurement was made with a cylinder geometry, which is suitable for low viscosities. The rotational viscometer has been chosen, since it is the only method allowing to easily check if the liquid shows Newtonian behavior (and is in fact the only one allowing to determine the viscosity of non-Newtonian liquids). While the OECD Guideline specifies a general quality criterion for the lower end of the rotational viscometer method of 10 mPa.s, the specific instrument used in the measurements (ThermoHaake RS1 rheometer) has - according to its manufacturer - an applicability range starting at 1 mPa.s. The results obtained in this study are above this value and are therefore considered reliable.

Applicant's summary and conclusion

Conclusions:
The dynamic viscosity is 6.55 mPa s at 30°C.
Executive summary:

The viscosity of the test substance was determined according to the OECD Guideline 114.

The dynamic viscosity at 30 °C is 6.55 mPa.s and the kinematic viscosity at 50 °C is 5.20 mm2/s