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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
04 January 2018 - 05 January 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Test method according to OECD Guideline 114 (OPPTS 830.7100). GLP study.
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7100 (Viscosity)
Deviations:
no
Qualifier:
according to guideline
Guideline:
CIPAC MT 3 (Specific gravity, density and weight per millilitre)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary viscometer (static)
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1.68
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1.2

Table 1: Density of Test Item and Ethylene Glycol at 20 ± 0.5 ºC

[A] Calibration of Specific Gravity bottle

Replication

Weight (g) of the Empty Pyknometer

(x)

Weight (g) of the Pyknometer with Water

(y)

Water Equivalence

WE = (y – x)

Capacity (mL) of Pyknometer

V20= 1.0018 (y - x)

1

20.0098

29.9814

9.9716

9.9895

2

19.8912

29.6000

9.7088

9.7263

3

19.9565

29.6399

9.6834

9.7008

[B] Density of Test Item

Replication

Weight (g) of the Empty Pyknometer

(x)

Weight (g) of the Pyknometer with Test Item

(y')

Weight (g) of Test Item

(y' – x)

Density (DS)  g/mL

1

20.0098

28.5207

8.5109

0.8520

2

19.8912

28.2439

8.3527

0.8588

3

19.9565

28.3095

8.3530

0.8611

Mean

0.8573

Standard Deviation

0.0047

[C] Density of Ethylene Glycol

Replication

Weight (g) of the Empty Pyknometer

(x)

Weight (g) of the Pyknometer with Ethylene Glycol

(y')

Weight (g) of Ethylene Glycol

(y' – x)

Density (DEG)  g/mL

1

20.0098

31.1333

11.1235

1.1135

2

19.8912

30.7308

10.8396

1.1145

3

19.9565

30.7659

10.8094

1.1143

Mean

1.1141

Standard Deviation

0.0005

Table 2: Density of Test Item and Ethylene Glycol at 40 ± 0.5 ºC

[A] Calibration of Specific Gravity bottle

Replication

Weight (g) of the Empty Pyknometer

(x)

Weight (g) of the Pyknometer with Water

(y)

Water Equivalence

WE = (y – x)

Capacity (mL) of Pyknometer

V40= [1.0018 (y - x) + 0.01]

1

21.0457

30.8467

9.8010

9.8286

2

18.3553

28.1331

9.7778

9.8054

3

19.0579

29.0710

10.0131

10.0411

[B] Density of Test Item

Replication

Weight (g) of the Empty Pyknometer

(x)

Weight (g) of the Pyknometer with Test Item

(y')

Weight (g) of Test Item

(y' – x)

Density (DS)  g/mL

1

21.0457

29.4461

8.4004

0.8547

2

18.3553

26.7326

8.3773

0.8544

3

19.0579

27.6207

8.5628

0.8528

Mean

0.8540

Standard Deviation

0.0010

[C] Density of Ethylene Glycol

Replication

Weight (g) of the Empty Pyknometer (x)

Weight (g) of the Pyknometer with Ethylene Glycol (y')

Weight (g) of Ethylene Glycol

(y' – x)

Density (DEG)  g/mL

1

21.0457

31.9285

10.8828

1.1073

2

18.3553

29.2240

10.8687

1.1084

3

19.0579

30.1664

11.1085

1.1063

Mean

1.1073

Standard Deviation

0.0011

Table 3: Calculation of Viscosity

Replication

Time Taken (in Seconds) by Ethylene Glycol to Flow from 'x' to 'y' [tEG] at

Time Taken (in Seconds) by Test Item to Flow from 'x' to 'y' [ts] at

Viscosity cP

(mPa s) at

20 ± 0.1 °C

40 ± 0.1 °C

20 ± 0.1 °C

40 ± 0.1 °C

20 ± 0.1 °C

40 ± 0.1 °C

1

2115

973

231

167

1.67

1.21

2

2114

972

234

166

1.70

1.20

3

2115

972

231

166

1.67

1.20

Mean

1.68

1.20

Standard Deviation

0.02

0.01

Conclusions:
The determined average viscosity of the test item was 1.68 ± 0.02 cP (mPa s) at 20°C and 1.20 ± 0.01 cP (mPa s) at 40ºC.

Executive summary:

The determination of viscosity of test item was performed according to OECD Guideline 114 using the capillary viscometer method (OPPTS 830.7100) for determination of flow time and capillary stoppered pyknometer method (CIPAC MT 3.2.1) for determination of density. The experiment was conducted in three replications at 20ºC and 40ºC. The determined average viscosity of the test item was 1.68 ± 0.02 cP (mPa s) at 20°C and 1.20 ± 0.01 cP (mPa s) at 40ºC.

Description of key information

Key study: OECD Guideline 114. GLP study: The determined average viscosity of the test item was 1.68 ± 0.02 cP (mPa s) at 20°C and 1.20 ± 0.01 cP (mPa s) at 40ºC. 

Key value for chemical safety assessment

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

Additional information

Key study: The determination of viscosity of test item was performed according to OECD Guideline 114 using the capillary viscometer method (OPPTS 830.7100) for determination of flow time and capillary stoppered pyknometer method (CIPAC MT 3.2.1) for determination of density. The experiment was conducted in three replications at 20ºC and 40ºC. The determined average viscosity of the test item was 1.68 ± 0.02 cP (mPa s) at 20°C and 1.20 ± 0.01 cP (mPa s) at 40ºC.

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