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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 26 August 2019 to 28 August 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
CIPAC MT 192 (Viscosity of liquids by rotational viscometry)
Deviations:
not specified
GLP compliance:
yes (incl. QA statement)
Type of method:
rotational viscometer (dynamic)
Key result
Temp.:
20°C
Parameter:
other: Dynamic viscosity (Pa.S)
Value:
ca. 0.34
Key result
Temp.:
40°C
Parameter:
other: Dynamic viscosity (Pa.S)
Value:
ca. 0.01

Result

The first measurement was performed at 20°C (see Table 1 and Table 2).

Table1: Shear viscosity with increasing shear rates at 20°C

Shear rate

(s-1)

Temperature

(°C)

Shear stress

(Pa)

Shear viscosity

(Pa s)

20.0

20.0

6.72

0.3361

24.2

20.0

6.78

0.2798

28.4

20.0

6.89

0.2425

32.6

20.0

7.11

0.2177

36.8

20.0

7.54

0.2046

41.1

20.0

7.60

0.1852

45.3

20.0

7.85

0.1735

49.5

20.0

8.01

0.1619

53.7

20.0

8.15

0.1517

57.9

20.0

8.34

0.1441

62.1

20.0

8.59

0.1383

66.3

20.0

8.89

0.1337

70.5

20.0

9.16

0.1298

74.7

20.0

9.40

0.1257

79.0

20.0

9.52

0.1206

83.2

20.0

9.75

0.1172

87.4

20.0

10.10

0.1156

91.6

20.0

10.32

0.1127

95.8

20.0

10.50

0.1096

100.0

20.0

10.75

0.1075

 

Table 2: Shear viscosity with decreasing shear rates at 20°C

Shear rate

(s-1)

Temperature

(°C)

Shear stress

(Pa)

Shear viscosity

(Pa s)

100.0

20.0

10.58

0.1058

95.8

20.0

10.21

0.1066

91.6

20.0

9.69

0.1058

87.4

20.0

9.31

0.1066

83.2

20.0

8.97

0.1078

79.0

20.0

8.56

0.1085

74.7

20.0

8.20

0.1097

70.5

20.0

7.81

0.1107

66.3

20.0

7.50

0.1130

62.1

20.0

7.03

0.1132

57.9

20.0

6.66

0.1151

53.7

20.0

6.31

0.1174

49.5

20.0

5.96

0.1204

45.3

20.0

5.62

0.1242

41.1

20.0

5.21

0.1268

36.8

20.0

4.96

0.1347

32.6

20.0

4.63

0.1419

28.4

20.0

4.31

0.1516

24.2

20.0

3.92

0.1620

20.0

20.0

3.59

0.1793

 

The second measurement was performed at 40°C (see Table 3 and Table 4).

Table 3: Shear viscosity with increasing shear rates at 40°C

Shear rate

(s-1)

Temperature

(°C)

Shear stress

(Pa)

Shear viscosity

(Pa s)

20.0

40.0

0.28

0.0139

24.2

40.0

0.33

0.0138

28.4

40.0

0.40

0.0140

32.6

40.0

0.45

0.0138

36.8

40.0

0.51

0.0138

41.1

40.0

0.57

0.0139

45.3

40.0

0.63

0.0140

49.5

40.0

0.69

0.0140

53.7

40.0

0.75

0.0139

57.9

40.0

0.81

0.0140

62.1

40.0

0.87

0.0140

66.3

40.0

0.93

0.0140

70.5

40.0

0.98

0.0139

74.7

40.0

1.05

0.0140

79.0

40.0

1.10

0.0140

83.2

40.0

1.16

0.0140

87.4

40.0

1.22

0.0139

91.6

40.0

1.28

0.0140

95.8

40.0

1.34

0.0140

100.0

40.0

1.40

0.0140

 

Table 4: Shear viscosity with decreasing shear rates at 40°C

Shear rate

(s-1)

Temperature

(°C)

Shear stress

(Pa)

Shear viscosity

(Pa s)

100.0

40.0

1.40

0.0140

95.8

40.0

1.34

0.0140

91.6

40.0

1.28

0.0140

87.4

40.0

1.22

0.0140

83.2

40.0

1.16

0.0140

79.0

40.0

1.10

0.0140

74.7

40.0

1.04

0.0139

70.5

40.0

0.99

0.0140

66.3

40.0

0.93

0.0140

62.1

40.0

0.87

0.0140

57.9

40.0

0.80

0.0139

53.7

40.0

0.75

0.0140

49.5

40.0

0.69

0.0139

45.3

40.0

0.63

0.0140

41.1

40.0

0.57

0.0139

36.8

40.0

0.51

0.0139

32.6

40.0

0.46

0.0140

28.4

40.0

0.40

0.0140

24.2

40.0

0.34

0.0139

20.0

40.0

0.28

0.0141

In all measurements the shear stress showed an increasing tendency with increasing shear rates. This indicated a valid measurement. In the measurements at 20°C the shear viscosity showed a significant dependence on the shear rate. At 20 °C the test substance behaved like a non-Newtonian liquid. A shear-thinning behaviour could be observed. The test substance was still a suspension after the measurement. In the measurements at 40°C the shear viscosity showed no significant dependence on the shear rate. At 40 °C the test substance behaved like a Newtonian liquid. The test substance was a homogeneous liquid after the measurement.

The dynamic viscosity was determined with shear rates from 20 s-1 to 100 s-1 to be 0.34 Pa·s at 20°C (start of the measurement (20 s-1)) and 0.01 Pa·s at 40°C.

The unusual behaviour of the test substance showing non-Newtonian liquid properties at 20°C and properties of a Newtonian liquid at 40°C was assumed to result from a melting and/or solving of the particles of the suspension at 40°C. This is in accordance with the optical observations after the measurements (20°C: suspension, 40°C: homogenous liquid).

Final results

The test substance behaved at 20°C like a non-Newtonian liquid and at 40°C like a Newtonian liquid (this different behaviour was most likely caused by melting/solving of the particles of the suspension at 40°C. The dynamic viscosity was determined with shear rates from 20 s-1 to 100 s-1 to be 0.34 Pa·s at 20°C (start of the measurement (20 s-1)) and 0.01 Pa·s at 40°C.

Conclusions:
Under the study conditions, the dynamic viscosity of the test substance was determined to be 0.34 Pa.s and 0.01 Pa.s at 20°C and 40°C, respectively.
Executive summary:

A study was conducted to determine the dynamic viscosity of the test substance using the rotational viscosimeter according to OECD Guideline 114, in compliance with GLP. The viscosity was determined using rotational viscosimetry using 20 different shear rates in the range from 20 s-1 to 100 s-1 at 20°C and 40°C. The test substance was shaken and afterwards a small sample was taken. For both measurements a cone with a diameter of 50 mm and an angle of 1° was used. The first measurement was performed at 20°C. The second measurement was performed at 40°C. In all measurements the shear stress showed an increasing tendency with increasing shear rates. This indicated a valid measurement. In the measurements at 20°C the shear viscosity showed a significant dependence on the shear rate. At 20°C the test substance behaved like a non-Newtonian liquid. A shear-thinning behaviour could be observed. The test substance was still a suspension after the measurement. In the measurements at 40°C the shear viscosity showed no significant dependence on the shear rate. At 40°C the test substance behaved like a Newtonian liquid. The test substance was a homogeneous liquid after the measurement. The dynamic viscosity was determined with shear rates from 20 s-1 to 100 s-1 to be 0.34 Pa·s at 20°C (start of the measurement (20 s-1)) and 0.01 Pa·s at 40°C. Under the study conditions, the dynamic viscosity of the test substance was determined to be 0.34 Pa.s and 0.01 Pa.s at 20°C and 40°C, respectively (Huber-Lohr, 2019).

Description of key information

The dynamic viscosity of the test substance was determined using the rotational viscosimeter according to OECD Guideline 114, in compliance with GLP (Huber-Lohr, 2019).

Key value for chemical safety assessment

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

Additional information

10 mPa·s at 40°C (dynamic viscosity)