Pin-2(3)-ene

Viscosity

Link to relevant study record(s)

Reference

Reference 1

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 for cross-reference:

other: no cross reference

Qualifier:

according to guideline

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.

Reference 2

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 for cross-reference:

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.