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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15 November 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted in accordance with OECD Guideline 114 but not under GLP. This study was considered as scientifically acceptable.
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
not specified
GLP compliance:
no
Type of method:
rotational viscometer (dynamic)
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 60.9
Remarks on result:
other: at constant shear rate of 583 s-1
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 12.4
Remarks on result:
other: at constant shear rate of 583 s-1

Results:

Measured values at different shear rates

The results obtained at 20°C were the following:

Table 1: Viscosities of the test item measured at 20°C:

 Shear rate ( 1/s )  Viscosity (mPa.s)
 349.4  59.90
 583.1  60.87
971.6   60.05
 1610  59.60

The results obtained at 40°C :

Table 2: Viscosities of the test item measured at 40°C:

 Shear rate ( 1/s )  Viscosity (mPa.s)
583.1 12.37
971.6 12.40
1610  12.40
 2705  12.40

The viscosity was constant at all shear rates at both temperatures. The test item was thus considered to be a Newtonian fluid.

Measured values at a constant shear rate

Table 3: Determination of the viscosity of the test item at a constant shear rate of 583.1 s-1

 Temperature (°C) (mPa.s) Viscosity 1st measurement (mPa.s)  Viscosity 2nd measurement (mPa.s)  Viscosity 3rd measurement 
  20  60.9  60.8  60.9
40  12.3  12.4 12.4 

The measurement as described is validated at least once every year.

The dynamic viscosity of the test item at 20°C and 40°C ranged between 12 to 61 mPa.s at a shear rate from 349 to 2705 s-1. Therefore, the test item was considered to be a Newtonian fluid.

Conclusions:
The dynamic viscosity of terpineol multiconstituent was determined to be:
- 60.9 mPa.s at 20.0°C ± 0.2 °C at constant shear rate of 583 s-1,
- 12.4 mPa.s at 40.0°C ± 1°C at constant shear rate of 583 s-1.
Executive summary:

Key study was performed in order to determine the viscosity of terpineol multiconstituent according to OECD Guideline No 114 and with Analytical Method DRT 5230 “Determination of dynamic viscosity with a rotary viscometer Haake VT550 or Rheolab QC”. The dynamic viscosity was determined at different shear rates and at a constant shear rate using a rotary viscometer.

The dynamic viscosity of the test item at 20°C and 40°C ranged between 12 to 61 mPa.s at a shear rate from 349 to 2705 s-1.

The test item was considered to be a Newtonian fluid.

The dynamic viscosity of TERPINEOL MULTICONSTITUENT was determined to be :

- 60.9 mPa.s at 20.0°C ± 0.2°C at a constant shear rate of 583 s-1,

- 12.4 mPa.s at 40.0°C ± 1°C at a constant shear rate of 583 s-1

The study was conducted in accordance with OECD Guideline 114 but not under GLP. Therefore this study was considered as scientifically acceptable.

Description of key information

The substance is considered as a Newtonian fluid.

The dynamic viscosity was determined to be 60.9 mPa.s at 20.0°C ± 0.2°C and 12.4 mPa.s at 40.0°C ± 1°C at a constant shear rate of 583 s-1 .

Key value for chemical safety assessment

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

Additional information

Key study was conducted in accordance with OECD Guideline 114 using a rotational viscosimeter, to measure the dynamic viscosity of terpineol multiconstituent at 20°C and 40°C at constant shear rate of 583 s-1

In these conditions, the dynamic viscosity was determined to be 60.9 mPa.s at 20.0°C ± 0.2°C and 12.4 mPa.s at 40.0°C ± 1°C at a constant shear rate of 583 s-1 . The test item was considered to be a Newtonian fluid.