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EC number: 201-291-9 | CAS number: 80-56-8
Viscosity
Administrative data
Link to relevant study record(s)
- 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.
- 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 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.
- 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.
Referenceopen allclose all
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 |
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 | |
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.
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