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Viscosity

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Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
August 2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study performed according to international guidelines but not under GLP and with some lack of details.
Reason / purpose:
other: no cross reference
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:
2.3
Remarks on result:
other: shear rate = 583.1 s-1
Remarks:
This value is the mean of 3 measurements.
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1.6
Remarks on result:
other: shear rate = 583.1 s-1
Remarks:
This value is the mean of 3 measurements.

Measured values at different shear rate

The results obtained at 20°C were the following:

Viscosities of the test item measured at 20°C:

Shear rate (1/s)  Viscosity (mPa.s)
 349.4  2.3
 583.1  2.3
 971.6

2.3

 1610

 2.3

The results obtained at 40°C were the following:

Viscosities of the test item at 40°C:

Shear rate (1/s)

 Viscosity (mPa.s)

 349.4

1.6

 583.1

 1.6

 971.6

 1.7

 1610

 1.7

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

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

 Temperature  Viscosity (1st measurement)  Viscosity (2nd measurement)  Viscosity (3rd measurement)
 20°C  2.2 mPa.s  2.4 mPa.s  2.2 mPa.s
 40°C  1.7 mPa.s  1.6 mPa.s  1.6 mPa.s
Conclusions:
The dynamic viscosity of the test item at 20°C and 40°C ranged between 1.6 to 2.3 mPa.s at a shear rate from 349.4 to 1610 s-1.
The test item was considered to be a Newtonian fluid.

The dynamic viscosity of alpha-pinene multiconstituent was determined to be:
- 2.3 mPa.s at 20°C ± 0.2°C at constant shear rate of 583.1 s-1,
- 1.6 mPa.s at 40°C ± 0.1°C at constant shear rate of 583.1 s-1.

alpha-Pinene multiconstituent is classified for aspiration toxicity Category 1 according to Regulation (EC) No 1272/2008 (CLP) criteria (hydrocarbon with a kinematic viscosity of less than 20.5 mm2/s at 40°C): may be fatal if swallowed and enters airways. The substance is classified harmful (R65: may cause lung damage if swallowed) according to Directive 67/548/EEC.
Executive summary:

The determination of the viscosity was performed in accordance with 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 of the test item at 20°C and 40°C ranged between 1.6 to 2.3 mPa.s at shear rates from 349.4 to 1610 s-1.

The test item was considered to be a Newtonian fluid.

The dynamic viscosity of alpha-pinene multiconstituent was determined to be:

- 2.3 mPa.s at 20.0°C ± 0.2°C at a constant shear rate of 583.1 s-1,

- 1.6 mPa.s at 40°C ± 0.1°C at a constant shear rate of 583.1 s-1.

Endpoint:
viscosity
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Justification for type of information:
α-Pinene is a bicyclic monounsaturated monoterpene and (-)-α-pinene is an enantiomeric form of α-pinene. Therefore, data on (-)-alpha pinene can be extrapolated to alpha-pinene. (see read-across justification document in section 13).
Reason / purpose:
read-across source
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 2.11
Remarks on result:
other: at a constant rate of 583.1 s-1. The test item was considered to be a Newtonian fluid.

The results obtained at 20°C are given in the following table "Viscosities of the test item measured at 20°C" :

Speed (1/min) Shear stress (1/s) Viscosity (mPa.s)
Measure 1  Measure 2 Measure 3  Mean Standard deviation
107,8 583,1 2,10 2,12 2,12 2,11 0,01
179,6 971,6 2,09 2,16 - 2,13  
297,9 1610 2,02 2,00 - 2,01  
500,0 2705 1,97 1,94 - 1,96  
Conclusions:
The dynamic viscosity of (-)-alpha-pinene was determined to be 2.11 ± 0.01 mPa.s at 20.0 ± 0.1 °C at a constant shear rate of 583.1 s-1.
The test item was considered to be a Newtonian fluid.
Therefore, (-)-alpha-pinene is classified for aspiration toxicity Category 1 (may be fatal if swallowed and enters airways) according to Regulation (EC) No 1272/2008 (CLP) criteria and harmful (R65: may cause lung damage if swallowed) according to Directive 67/548/EEC.
Executive summary:

The study was conducted in accordance with OECD Guideline 114 using a rotational viscosimeter, to measure the dynamic viscosity of (-)-alpha-pinene at 20 °C and at constant shear rate of 583 .1 s-1. In these conditions, the dynamic viscosity was determined to be 2.11 ± 0.01 mPa.s.

Therefore, (-)-alpha-pinene is classified for aspiration toxicity Category 1 (may be fatal if swallowed and enters airways) according to Regulation (EC) No 1272/2008 (CLP) criteria and harmful (R65: may cause lung damage if swallowed) according to Directive 67/548/EEC.

Description of key information

The dynamic viscosity was determined with a rotational viscometer. 
The substance can be considered as a Newtonian fluid. The dynamic viscosity of alpha-pinene multiconstituent at a shear rate of 583.1 s-1 is 2.3 mPa.s at 20°C and 1.6 mPa.s at 40°C.
alpha-Pinene multiconstituent is classified for aspiration toxicity Category 1 (may be fatal if swallowed and enters airways) according to Regulation (EC) No 1272/2008 (CLP) criteria and harmful (R65: may cause lung damage if swallowed) according to Directive 67/548/EEC.

Key value for chemical safety assessment

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

Additional information

Key study conducted according to OECD 114 Guideline.

The result is scientifically acceptable but not obtained under GLP. Therefore a reliability of 2 (reliable with restrictions) is assigned.

The viscosity value is supported by consistent experimental data obtained with (-)-alpha-pinene.