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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard OECD test guideline
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
GLP compliance:
no
Type of method:
other: Redwood Viscometer
Key result
Temp.:
20°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
24.7
Key result
Temp.:
40°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
21.983
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
23.863
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
21.238

TEST DESCRIPTION AND RESULT

Method Details

Observations

Remarks if, any

Guideline

OECD 114

 

 

Method of measurement

Redwood Viscometer No. -1

 

Principle of method

The flow of test item under gravity through a capillary using Redwood Viscometer No. 1

 

Temperature at which the testing was done

20°C and 40°C

 

Observations

Time taken to fill 50ml flask at 20°C in ‘Sec’ (Mean Value)

100 sec

Time taken to fill 50ml at 40°C flask in ‘Sec’ (Mean Value)

89 sec

Density of fluid in gm/cc

0.9661 gm/cc

CALCULATIONS:

ν= ct----------------------------------------- (i)

Where,ν= Kinematic viscosity

c= Viscometer constant

t= time of flow in seconds (Redwood second) For Redwood Viscometer- I, the values for the constants are as

below:

 

Time of flow, t

C

40 to 85 seconds

0.264

85 to 2000

0.247

 

ν=η/ρ------------------------------ (ii)

Where,ν= Kinematic viscosity

η= Dynamic viscosity

ρ= Density of fluid

1. Calculation of Kinematic Viscosities:

 

For Test Temperature at 20°C

ν=ct

= 100 × 0.247sec

= 24.7000 mm²/sec

 

For Test Temperature at 40°C

ν=ct

= 89 × 0.247sec

= 21.9830 mm²/sec

 

2. Calculation of Dynamic Viscosities:

For Test Temperature at 20°C

ν= η/ρ

24.7000 =η 0.9661

η = 24.7000 x 0.9661

= 23.8626 mPa.S

 

For Test Temperature at 40°C

ν= η/ρ

21.9830 =η/ 0.9661

η = 21.9830 x 0.9661

= 21.2377 mPa.S

Conclusions:
Kinematic viscosity (experimental) of test chemical at 20°C and 40°C was determined to be 24.7 mm²/sec & 21.983 mm²/s and Dynamic viscosity of the test chemical was calculated to be 23.8626 mPa.S & 21.2377 mPa.S at 20°C and 40°C, respectively.
Executive summary:

The viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Kinematic viscosity (experimental) of test chemical at 20°C and 40°C was determined to be 24.7 mm²/sec & 21.983 mm²/s and Dynamic viscosity of the test chemical was calculated to be 23.8626 mPa.S & 21.2377 mPa.S at 20°C and 40°C, respectively.

Description of key information

On the basis of the available data from study report, the viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Kinematic viscosity (experimental) of test chemical at 20°C and 40°C was determined to be 24.7 mm²/sec & 21.983 mm²/s and Dynamic viscosity of the test chemical was calculated to be 23.8626 mPa.S & 21.2377 mPa.S at 20°C and 40°C, respectively.

Key value for chemical safety assessment

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

Additional information

On the basis of the available data from study report, the viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Kinematic viscosity (experimental) of test chemical at 20°C and 40°C was determined to be 24.7 mm²/sec & 21.983 mm²/s and Dynamic viscosity of the test chemical was calculated to be 23.8626 mPa.S & 21.2377 mPa.S at 20°C and 40°C, respectively.

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