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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 OCT 2011 - 08 NOV 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP-Study
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
rotational viscometer (dynamic)
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
59.35
Remarks on result:
other: Standard deviation: 0.37 mPa s
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
19.82
Remarks on result:
other: Standard deviation: 0.05 mPa s

The evaluation and calculation of the results was executed automatically by the rheoplus software. The viscosities of each measuring point as well as the calculated results are summarized in the following table:

Temperature [°C]      20.00     40.00   
 Measuring Point  Shear Rate  Viscosity  Viscosity  Viscosity  Viscosity
   [1/s]  [mPa s]  [mPa s]  [mPa s]  [mPa s]
 1 0.1   57.4  56.0  22.7  21.9
 2  0.144  54.4  58.9  19.7  19.5
 3  0.207  56.0  59.8  20.2  20.3
 4  0.298  58.6  59.7  20.5  20.0
 5  0.428  59.3  60.6  20.2  20.4
 6  0.616  59.6  59.7  20.2  20.1
 7  0.886  59.8  60.2  19.6  19.9
 8  1.27  59.5  59.5  19.6  19.5
 9  1.83  59.7  59.8  19.4  19.6
 10  2.64  59.9  59.9  19.7  19.7
 11  3.79  59.9  59.9  19.5  19.7
 12  5.46  59.9  59.9  19.5  19.7
 13  7.85  60.0  59.9  19.5  19.6
 14  11.3  60.0  59.9  19.5  19.7
 15  16.2  59.9  59.9  19.5  19.7
 16  23.4  60.0  59.9  19.5  19.7
 17  33.6  59.9  59.9  19.5  19.7
 18  48.3  59.9  59.9  19.5  19.6
19   69.5  59.9  59.9  19.5  19.6
 20  100  59.8  59.8  19.4  19.6
 Average [mPa s]     59.090  59.614  19.783  19.857
 Average [mPa s]     59.35     19.82   
 SD [mPa s]     0.371     0.052   
 RSD [%]     0.62     0.26   
Conclusions:
- dynamic viscosity (at 20°C) = 59.35 ± 0.37 mPa s;
- dynamic viscosity (at 40°C) = 19.82 ± 0.05 mPa s
Executive summary:

The dynamic viscosity at 20 °C and at 40 °C of the substance was investigated in a GLP study according to OECD guideline 114 (2011) by using a cone/plate-rheometer. The dynamic viscosity has been determined to be 59.35 ± 0.37 mPa s at 20 °C and 19.82 ± 0.05 mPa s at 40 °C.

Description of key information

The dynamic viscosity at 20 °C and at 40 °C of the substance was investigated in a GLP study according to OECD guideline 114 (2011) by using a cone/plate-rheometer. The dynamic viscosity has been determined to be 59.35 ± 0.37 mPa s at 20 °C and 19.82 ± 0.05 mPa s at 40 °C.

Key value for chemical safety assessment

Viscosity:
59.35 mPa · s (dynamic)
at the temperature of:
20 °C

Additional information

The kinematic viscosity at 20 °C of the substance has been determined to be 59.09 mm2/s in a non-GLP supporting study (Blaul, 2012) according to ASTM D 7042 (which is equivalent to ISO 3104 / ASTM D445) with a rotational viscometer.

With the denisity (den) of the substance (1.0457 g/cm3) the kinematic viscosity (kin) is connected directly with the dynamic viscosity (dyn) via dyn = den x kin.

As a result the calculated dynamic viscosity from the measured density and kinematic viscosity is: 1.0457 g/cm3 x 59.09 mm2/s = 61.81 mP s. This is in the range of the measured key-value and supports the validity of the key study (Sonnenschein, 2011)