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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed according to international guidelines
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Version / remarks:
adopted on 12 May 1981
Deviations:
not specified
GLP compliance:
yes (incl. certificate)
Remarks:
DIN EN ISO/IEC 17025 certified
Type of method:
rotational viscometer (dynamic)
Specific details on test material used for the study:
Umicore h80 paste
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
330 000
Remarks on result:
other: shear rate of 1/s, average of 2 tests
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
>= 4 700 - <= 3 500 000
Remarks on result:
other: viscosity measured at shear rates between 0.1/s and 100/s
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
>= 2 300 - <= 840 000
Remarks on result:
other: viscosity measured at shear rates between 0.1/s and 100/s

The sample shows a non-newtonion behaviour. It is a shear thinning material, i.e. an increase in relative velocity causes a reduction in viscosity.

 Viscosity Pa s  20 °C     40 °C   
 Shear rate  Test #1  Test #2  Test #1  Test #2
 0.1/s  3.5 E+3  1.7 E+3  8.4 E+2  6.0 E+2
 1.0/s  4.5 E+2  2.1 E+2  1.8 E+2  8.3 E+1
 10 /s  4.8 E+1  3.2 E+1  3.0 E+1  1.5 E+1
 100 /s  6.9  4.7  3.5  2.3
Conclusions:
The dynamic viscosity is 330000 mPa S at 20°C and a shear rate of 1/s.

Description of key information

The dynamic viscosity measured at 20 °C and a shear rate of 1/s is 330000 mPa s.

Key value for chemical safety assessment

Viscosity:
2 300 000 mPa · s (dynamic)
at the temperature of:
20 °C

Additional information