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Physical & Chemical properties

Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 18 October 2012 to 18 December 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in compliance with international standard guidelines under GLP conditions. The study report was well documented with all mandatory information included
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
11-04-11
Type of method:
other: rolling ball viscometer
Temp.:
other: 19.98°C
Parameter:
dynamic viscosity (in mPa s)
Value:
> 24.128 - < 24.168
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
> 9.63 - < 9.641
Temp.:
other: 19.98°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
> 21.764 - < 21.8
Temp.:
40°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
> 8.686 - < 8.697

All measured values and the corresponding calculation results are given in the following table:

 

Determination at 40 °C

 

Temperature

Falling Time

Total Time

 

Measurement

 

Time [min]

Time

[s]

Total Time [s]

Viscosity [mPa*s]

No. 1

40.00

1

50.81

110.81

9.6418

No. 2

40.00

1

50.72

110.72

9.6340

No. 3

40.00

1

50.68

110.68

9.6305

Mean

 

 

 

110.74

9.6354

Standard Deviation

 

 

 

0.07

0.0058

RSD

 

 

 

 

0.06%

 

Determination at 20 °C

 

Temperature

Falling Time

Total Time

 

Measurement

 

Time [min]

Time

[s]

Total Time [s]

Viscosity [mPa*s]

No. 1

19.98

4

37.34

277.34

24.1320

No. 2

19.98

4

37.44

277.44

24.1407

No. 3

19.98

4

37.78

277.78

24.1702

Mean

 

 

 

277.52

24.1476

Standard Deviation

 

 

 

0.23

0.0201

RSD

 

 

 

 

0.08%

Calculation of Dynamic Viscosity

For each measurement, the dynamic viscosity of the test item was calculated using the following equation:

n = K* (p1 -p2)*t

with

n  = dynamic viscosity in mPa * s
K = constant of ball used in mPa * s * cm3/(g*s)

p1  = density of ball used in g/cm3
p2 = density of test item in g/cm3
t = falling time for the ball in s

Parameters of ball used are given in the table below:

Material

Density (g/cm3)

Diameter (mm)

Minimum Falling Time (s)

Constant k [ 

mPa * s * cm3/(g*s)]

Measuring range (mPa*s)

Borosilicate glass

2.231

15.636

30

0.07752

3 - 30

Calculation of kinematic viscosity:

The kinematic viscosity of the test item was calculated using the following equation:

v = n /p2

with

v = kinematic viscosity in mm²/s

n = dynamic viscosity in mPa*s

p2= density of test item in g/cm3 (1.1086 g/cm3 at 20°C)

Results:

Results of the single determinations with the respective standard deviation as well as the mean value and the standard deviation of all six individual experiments are presented in the following table:

 

Experiment 1 at 40 °C

Experiment 2 at 20 °C

Determination

Dynamic Viscosity in mPa*s

Dynamic Viscosity in mPa*s

1

9.6418

24.1320

2

9.6340

24.1407

3

9.6305

24.1702

Mean

9.6354

24.1476

Standard Deviation

0.0058

0.0201

RSD

0.06%

0.08%

 

Kinematic Viscosity in mm²/s

Kinematic Viscosity in mm²/s

Mean

8.6915

21.7821

Standard Deviation

0.0052

0.0181

The mean of each series of three measurements was calculated. The allowed maximum deviation is given in the following table:

Ball #

RSD in %

2, 3

0.5

As the measured RSD were 0.06 % at 40.00 °C and 0.08 % at 19.98 °C, the validity criterion is met.

The dynamic viscosity of an aqueous solution of test item was determined as 24.1476± 0.0201 mPa *s at 19.98 °C and 9.6354 ± 0.0058 mPa *s at 40.00 °C. These values correspond to a kinematic viscosity of 21.7821 ± 0.0181mm2/s at19.98 °C and 8.6915 ± 0.0052mm2/sat 40.00 °C).

Both dynamic viscosity values are the mean of three individual measurements. Precision of each value is given as standard deviation of the individual measurements. As the measured RSD were 0.08 % (19.98 °C) and 0.06 % (40.00 °C), the validity criterion (RSD < 0.5 %) is met.

No observations arousing doubts concerning the accuracy of the results and the validity of the study were made.

Conclusions:
The dynamic viscosity of the test item was determined as 24.1476 ± 0.0201 mPa *s at 19.98 ± 0.1 °C and 9.6354 ± 0.0058mPa *s at 40.0 ± 0.1 °C (corresponding to a kinematic viscosity of 21.7821 ± 0.0181mm²/s at 19.98± 0.1 °C and 8.6915± 0.0052 mm²/s at 40.0 ± 0.1 °C).
Executive summary:

The determination of viscosity was performed with a rolling ball viscometer according to Method 114 of OECD Guidelines for Testing of Chemical 12 May 1981 and GLP. No deviation form the Guideline was observed during the test.

The dynamic viscosity is calculated from the falling time of a ball with known density and constant k in a calibrated rolling ball viscometer following Hoeppler and the density of the test item.

The dynamic viscosity of the test item was determined as 24.1476 ± 0.0201 mPa *s at 19.98 ± 0.1 °C and 9.6354 ± 0.0058mPa *s at 40.0 ± 0.1 °C (corresponding to a kinematic viscosity of 21.7821 ± 0.0181mm²/s at 19.98± 0.1 °C and 8.6915± 0.0052 mm²/s at 40.0 ± 0.1 °C).

Description of key information

Experimental value of viscosity: 24.1476 ± 0.0201 mPa *s at 19.98 ± 0.1 °C and 9.6354 ± 0.0058mPa *s at 40.0 ± 0.1 °C (corresponding to a kinematic viscosity of 21.7821 ± 0.0181mm²/s at 19.98± 0.1 °C and 8.6915± 0.0052 mm²/s at 40.0 ± 0.1 °C).

Key value for chemical safety assessment

Viscosity:
21.782 mm²/s (static)
at the temperature of:
20 °C

Additional information

The experimental determination of viscosity was performed with a rolling ball viscometer according to Method 114 of OECD Guidelines for Testing of Chemical 12 May 1981 and GLP. No deviation form the Guideline was observed during the test.