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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:
Data is from study report
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
GLP compliance:
no
Type of method:
other: Redwood Viscometer No. - 1
Key result
Temp.:
20°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
15.655
Temp.:
40°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
14.678
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
15.717
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
14.736

Observation table:

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 capillaryusing RedwoodViscometer No. 1

 

Temperature at which the testing is done

20°C and 40°C

 

 

 

Observations

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

59.3 sec

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

55.6 sec

Density of fluid in gm/cc

1.004 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 200C

               ν=ct

                = 0.264x59.3sec

                = 15.655mm2/sec

 

For Test Temperature at 400C

ν=ct

               = 0.264X55.6sec

               = 14.678mm2/s

 

2.      Calculation of Dynamic Viscosities:

 

For Test Temperature at 200C

               ν= η/ρ

               15.655 =η/1.004

               η = 15.655x1.004

                 =15.717mPa.S

 

For Test Temperature at 400C

               ν= η/ρ

               14.678 =η/1.004

               η = 14.678 x 1.004

                 = 14.736mPa.S

Conclusions:
Based on the study, the kinematic viscosity (experimental) of test chemical at 20 °C and 40 °C was determined to be at 15.655mm2/sec and 14.678 mm2/s , respectively, whereas the dynamic viscosity (calculated) of test chemical at 20 °C and 40 °C was determined to be 15.717mPa.S and 14.736mPa.S, respectively.

Executive summary:

The viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Based on the study, the kinematic viscosity (experimental) of test chemical at 20 °C and 40 °C was determined to be at 15.655mm2/sec and 14.678 mm2/s , respectively, whereas the dynamic viscosity (calculated) of test chemical at 20 °C and 40 °C was determined to be 15.717mPa.S and 14.736mPa.S, respectively.

Description of key information

The viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Based on the study, the kinematic viscosity (experimental) of test chemical at 20 °C and 40 °C was determined to be at 15.655mm2/sec and 14.678 mm2/s , respectively, whereas the dynamic viscosity (calculated) of test chemical at 20 °C and 40 °C was determined to be 15.717mPa.S and 14.736mPa.S, respectively.

Key value for chemical safety assessment

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

Additional information

The viscosity determination of test chemical was done as per the test guideline OECD 114 using Redwood Viscometer No. 1. Based on the study, the kinematic viscosity (experimental) of test chemical at 20 °C and 40 °C was determined to be at 15.655 mm2/sec and 14.678 mm2/s , respectively, whereas the dynamic viscosity (calculated) of test chemical at 20 °C and 40 °C was determined to be 15.717mPa.S and 14.736mPa.S, respectively.

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