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Physical & Chemical properties

Viscosity

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Link to relevant study record(s)

Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 April 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted according to OECD 114 guideline, under GLP without deviation and with certificate of analysis included.
Reason / purpose for cross-reference:
reference to other study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
2017-01-10
Type of method:
rotational viscometer (dynamic)
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 1.66
Remarks on result:
other: shear rate = 264 s-1
Remarks:
First determination. This value is the mean of 2 measurements.
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
< 1.5
Remarks on result:
other: shear rate = 264 s-1
Remarks:
First determination. This value is the mean of 2 measurements.
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 1.66
Remarks on result:
other: shear rate = 264 s-1
Remarks:
Second determination. This value is the mean of 2 measurements.
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
< 1.5
Remarks on result:
other: shear rate = 264 s-1
Remarks:
Second determination. This value is the mean of 2 measurements.
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 1.66
Remarks on result:
other: shear rate = 264 s-1
Remarks:
Final value
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
< 1.5
Remarks on result:
other: shear rate = 264 s-1
Remarks:
Final value

Results:

Results of the pre-test:

 Temperature

(°C)

Speed

(RPM*) 

  Torque (%)  Shear rate (s-1)   Time (sec) 

 Dynamic Viscosity

(mPa.s)

 20.0 120  6.5 158.400  120  1.62 
20.0  150  8.2 198.000  240  1.64
20.0  180  9.9 237.000  360  1.65
20.0  200  11.1 264.000 480  1.66

*RPM: Rotation Per Minute

The test item is considered as Newtonian because the difference between the lowest and the highest value is 2.47%. As a reminder, a fluid is considered as Newtonian if the difference between the lowest and the highest value is fewer than 3%.

First determination:

  Results of the first determination
 Temperature (°C) Speed (RPM)  Torque (%)  Shear rate (s-1)  Viscosity (mPa.s) 

 Mean viscosity

(mPa.s)

 Difference

(%)

 20.0 200 11.1 264.000 1.66

    1.66

    0

20.0  200  11.1 264.000 1.66
40.0 200  8.3 264.000 1.24

    1.24

    0

40.0 200  8.3  264.000 1.24

Second determination:

  Results of the second determination

 Temperature (°C) Speed (RPM)  Torque (%)  Shear rate (s-1)  Viscosity (mPa.s) 

 Mean viscosity

(mPa.s)

 Difference

(%)

 20.0 200  11.1 264.000 1.66 

    1.66

    0.61

20.0  200  11.1 264.000  1.65 
40.0 200 

8.2 

264.000  1.23 

    1.23

    0

40.0

200  8.2  264.000  1.23

 

Conclusions:
According to OECD 114 Guideline, the viscosity estimated for the test item is 1.66 mPa.s at 20°C and < 1.5 mPa.s at 40°C at the shear rate 264s-1.
Executive summary:

A study was performed to determine the viscosity of the test item GUM TURPENTINE OIL. The method followed was designed to be compliant with the OECD Guideline for Testing of Chemicals No. 114, ''Viscosity of Liquids".

In this method, the measurement is performed under different shear conditions.

A rotational viscometer measures the mechanical resistance of a fluid that work opposite the rotational movement of a spindle. A spindle is therefore immersed into the fluid and a rotation is applied through a calibrated spring. The resistance exerted on the spindle is estimated by the spring twist. The spindle shear rate, the spindle size and shape, the fluid container and the full scale of the spring torque determine the measuring range. Under the study conditions, values of viscosity between 1.5 and 300000 mPa.s can be measured.

This technique allows measuring the dynamic viscosity of Newtonian liquids (for which the viscosity does not depend on shear rate or time) and non-Newtonian liquids (for which the viscosity depends on shear rate or time).

A pre-test was firstly performed and allowed classifying the test item as a Newtonian liquid.

Two determinations were then performed.

At 20.0°C, the mean of the two dynamic viscosities obtained is 1.66 mPa.s for the first determination and 1.6 mPa.s for the second. The difference between the two determinations is 0.0% so the average is given as result:

n (20.0°C +/- 0.1, 264 s-1) = 1.66 mPa.s

At 40°C, the dynamic viscosity obtained with the two determinations is below 1.5 mPa.s. Considering the expression of results from the study plan, dynamic viscosity of the test item is expressed as follows:

n (40.0°C +/- 0.1, 264 s-1) < 1.5 mPa.s

Description of key information

The dynamic viscosity of gum turpentine oil at 25°C is 1.30 mPa.s. 

Key value for chemical safety assessment

Viscosity:
1.3 mPa · s (dynamic)
at the temperature of:
25 °C

Additional information

The self-ignition temperature of GUM TURPENTINE OIL was estimated in a read-across approach based on the main constituents of the substance and on structural similarity between constituents.