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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 21 June 2012 to 11 October 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
11-04-11
Type of method:
other: Rolling Ball Viscometer
Key result
Temp.:
40°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
> 1.227 - < 1.251
Key result
Temp.:
20°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
> 1.864 - < 1.881
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
> 2.086 - 2.127
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
> 3.169 - < 3.197

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

 

Determination at 20 °C

 

Temperature

Falling Time

Total Time

 

Measurement

 

Time (min)

Time

(s)

Total Time (s)

Viscosity (mPa*s)

No. 1

20.02

7

6.22

426.22

3.1712

No. 2

20.10

7

7.31

427.31

3.1793

No. 3

20.06

7

9.91

429.91

3.1986

Mean

427.81

3.1830

Standard Deviation

1.90

0.0141

RSD

0.44%

 

Determination at 40 °C

 

Temperature

Falling Time

Total Time

 

Measurement

 

Time (min)

Time

(s)

Total Time (s)

Viscosity (mPa*s)

No. 1

39.90

4

46.31

286.31

2.1302

No. 2

40.00

4

42.09

282.09

2.0988

No. 3

39.90

4

41.06

281.06

2.0912

Mean

283.15

2.1067

Standard Deviation

2.78

0.0207

RSD

 

0.98%

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 the test item ( 1.7 g/cm3)

t falling time for the ball in s

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 20°C

Experiment 2 at 40°C

Determination

Dynamic Viscosity in mPa*s

Dynamic Viscosity in mPa*s

1

3.1712

2.1302

2

3.1793

2.0988

3

3.1986

2.0912

Mean

3.1830

2.1067

Standard Deviation

0.0141

0.0207

RSD

0.44%

0.98%

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 the test item ( 1.7 g/cm3)

Results of this determination are presented in the following table:

 

Kinematic Viscosity in mm²/s

Kinematic Viscosity in mm²/s

Mean

1.8724

1.2392

Standard Deviation

0.0082

0.0121

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 0.44 % (20°C) and 0.98% (40°C), the validity criterion (RSD < 2 %) is met.

Conclusions:
The dynamic viscosity of the test item was determined as 3.1830 ± 0.0141 mPa *s at 20.0 ± 0.1 °C and 2.1067 ± 0.0207 mPa *s at 40.0 ± 0.1 °C (corresponding to a kinematic viscosity of 1.8724 ± 0.0082 mm2/s at 20.0 ± 0.1 °C and 1.2392 ± 0.0121 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 3.1830 ± 0.0141 mPa *s at 20.0 ± 0.1 °C and 2.1067 ± 0.0207 mPa *s at 40.0 ± 0.1 °C (corresponding to a kinematic viscosity of 1.8724 ± 0.0082 mm2/s at 20.0 ± 0.1 °C and 1.2392 ± 0.0121 mm2/s at 40.0 ± 0.1 °C).

Description of key information

Experimental value of viscosity :

3.1830 ± 0.0141 mPa *s at 20.0 ± 0.1 °C (corresponding to a kinematic viscosity of 1.8724 ± 0.0082 mm2/s)
2.1067 ± 0.0207 mPa *s at 40.0 ± 0.1 °C ( corresponding to a kinematic viscosity of 1.2392 ± 0.0121 mm2/s at 40.0 ± 0.1 °C).
Other Data at 25°C: 2.87 Cp (company data)

Key value for chemical safety assessment

Viscosity:
1.872 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 from the Guideline was observed during the test.

The supporting study is consistent with the key study result.