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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26 December 2012 - 04 April 2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
Study performed according to international guidelines but not under GLP and with some lack of details.
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
Principles of method if other than guideline:
The purpose of the study was to determine the viscosity of (-)-alpha pinene. The dynamic viscosity was determined at different shear rates and at a constant shear rate using a rotational viscosimeter
GLP compliance:
no
Type of method:
rotational viscometer (dynamic)
Key result
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 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) and harmful (R65: may cause lung damage if swallowed) according to Directive 67/548/EEC.

Key value for chemical safety assessment

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

Additional information

Key study conducted according to the 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 multiconstituent.