Amines, C16-18-alkyldimethyl

Viscosity

Link to relevant study record(s)

Reference

Endpoint:

viscosity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 September 2011 - 16 March 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

According to OECD Guideline 114

Qualifier:

according to guideline

Guideline:

OECD Test Guideline 114 (Viscosity of Liquids)

Type of method:

rotational viscometer (dynamic)

Temp.:

20°C

Parameter:

dynamic viscosity (in mPa s)

Value:

7.34

Temp.:

40°C

Parameter:

dynamic viscosity (in mPa s)

Value:

4.5

Values are the means from two trials (with 12 runs each). While the standard error of the means (0.012 mPa s at 20°C and 0.015 mPa s at 40°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 20°C: 7.34 ± 0.18 mPa.s

at 40°C: 4.50 ± 0.11 mPa.s

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

at 20°C: 9.12 ± 0.23 mm²/s

at 40°C: 5.69 ± 0.14 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.

Conclusions:

The dynamic viscosity is 7.34 mPa s at 20°C.

Executive summary:

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

The dynamic viscosity at 20 °C is 7.34 mPa.s and the kinematic viscosity at 40 °C is 5.69 mm²/s

Description of key information

See additional information below.

Key value for chemical safety assessment

Viscosity:

7.34 mPa · s (dynamic)

at the temperature of:

20 °C

Additional information

The viscosity of the test substance was determined according to the OECD Guideline 114.
The dynamic viscosity at 20 °C is 7.34 mPa.s and the kinematic viscosity at 40 °C is 5.69 mm^2/s