Registration Dossier

Administrative data

Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report Date:
2017

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Qualifier:
according to
Guideline:
CIPAC MT 192 (Viscosity of liquids by rotational viscometry)
GLP compliance:
yes
Type of method:
rotational viscometer (dynamic)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid: viscous
Specific details on test material used for the study:
Batch number: 78-242-15

Results and discussion

Viscosityopen allclose all
Temp.:
other: 50 °C
Parameter:
dynamic viscosity (in mPa s)
Value:
4 548
Temp.:
other: 60°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1 233
Temp.:
other: 50*C
Parameter:
kinematic viscosity (in mm²/s)
Value:
6 125
Temp.:
other: 60°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
1 660

Any other information on results incl. tables

Calculations

Setting in the Brookfield digital viscometer the cylindrical spindle number and the speed (rpm), the instrument software directly calculates the dynamic viscosity (cP) and shows it in the display of the viscometer.

The Dynamic viscosity (cP) value is calculated by the following formula set in the instrument software:

 

                                   Dynamic viscosity (cP) = F x u

 where:

u         =         Reading value of dynamic viscosity (cP).

F         =         Factor of the specific spindle (pure number).

Kinematic viscosity can be calculated only for Newtonian liquids using the following formula:

                       (u) Kinematic viscosity (cSt) = Dynamic viscosity (cP) / d

 where:

d         =         Density of the sample (g/mL).

Using the basic equation that correlates kinematic viscosity and temperature (ASTM method D341): log[log(u+ 0.7)] = A - B log T

the Kinematic viscosity has been extrapolated at 20°Cfirstly rearranging the above equation, to obtain A and B:

A = log[log(u2 + 0.7)] + B log(T2) 

B = {log[log(u2 + 0.7)] – log[log(u1+0.7)]} / (logT1-logT2)

 

then obtaining the value at 20°C as follows: 

u= 10^{10^[A-B*Log(T)]}-0.7

Applicant's summary and conclusion

Conclusions:
The test item is a Newtonian liquid and its dynamic viscosity does not change with the shear rate. The dynamic viscosity at 20°C is 3.59 x 10E8 cSt (extrapolated value); the kinematic viscosity at 20°C is 2.67 x 10E8 cP (extrapolated value).