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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
06-January-2010 to 04-February 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Version / remarks:
The viscosity was determined, using a procedure specified in Method 114 of the OECD Guidelines for Testing of Chemicals, 12 May 1981.
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
rotational viscometer (dynamic)
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
99.8
Key result
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
31.6

The determination of the viscosity of 2-ethylhexyl 4-methoxycinnamate was performed according to the OECD guideline No. 114, "Viscosity of Liquids" using the rotational viscosimeter method.

The viscosity of 2-ethylhexyl 4-methoxycinnamate was measured over a shear rate range from 0 s-1 to 1130 s-1 at 20 °C and from 0 s-1 to 2050 s-1 at 40 °C. The viscosity values did not vary with the shear rate within the limits of accuracy of the instrument. This indicates that 2-ethylhexyl 4-methoxycinnamate is a Newtonian fluid. 2-ethylhexyl 4-methoxycinnamate has a viscosity of 99.80 mPa·s at 20 °C and 31.60 mPa·s at 40 °C.

The individual values used for determination of the viscosity are given in Tables below. Examples of the flow curves of 2-ethylhexyl 4-methoxycinnamate are shown in the attached Figures.

Table 1       Calibration Data of the Viscosity

Calibration oil

E200

Nominal Value

Viscosity
Actual Value

Deviation

[mPa·s]

[mPa·s]

[%]

112

114.08

1.86

 

The calibration was performed before the sample measurement with calibration oil E200 using the cylinder system at 20.0 °C. E200 (supplier Thermo Fisher, Ser. No. 12009/00026, certified viscosity as given by the supplier: 112 mPa·s) is a mixture of mineral oils which are recommended as reference substances by IUPAC and which are mentioned in OECD guideline No.114. The actual viscosity of the measurement varies about 1.86 % with respect to the certified viscosity labeled. This deviation is in accordance with the criteria as described in the internal SOP, where a range of ± 4 % is accepted.

 

Table 2       Determination of the Physico-Chemical Property Viscosity of the Test Item: Results at 20°C

Temperature

 

Shear Stress

 

Dynamic Viscosity

1st Measurement

2nd Measurement

[°C]

[s-1]

[mPa·s]

[mPa·s]

20

216

103.4

104.0

287

102.9

103.3

357

102.3

101.8

428

102.6

98.49

499

99.93

100.3

569

102.0

97.71

639

98.42

101.5

710

100.2

97.76

781

97.93

99.72

851

98.24

98.72

921

97.98

98.39

993

97.65

98.16

1060

98.00

97.73

1130

97.12

98.08

Mean value (calculated from the bold values):

99.80

  

Table 3       Determination of the Physico-Chemical Property Viscosity of the Test Item: Results at 40 °C

Temperature

 

Shear Stress

 

Dynamic Viscosity

3rd Measurement

4th Measurement

[°C]

[s-1]

[mPa·s]

[mPa·s]

40

781

32.62

34.15

851

33.13

34.07

921

32.72

33.93

993

32.74

33.46

1060

31.93

33.11

1130

32.27

32.04

1200

31.37

32.20

1270

30.81

32.52

1340

30.95

32.04

1410

31.10

31.64

1490

30.81

31.68

1560

30.75

31.48

1630

30.66

31.25

1700

30.62

30.97

1770

30.60

30.83

1840

30.28

30.69

1910

30.13

30.59

1980

29.98

30.43

2050

30.08

30.34

Mean value (calculated from the bold values):

31.60

Conclusions:
The viscosity of 2-ethylhexyl 4-methoxycinnamate decreases with increasing temperature from 99.80 mPas at 20 °C to 31.60 mPas at 40 °C. The viscosity does not depend on the shear rate. It can be stated, that 2-ethylhexyl 4-methoxycinnamate is a Newtonian fluid.
Executive summary:

The viscosity of 2-ethylhexyl 4-methoxycinnamate was determined at 20 °C and 40 °C according to the OECD Method No. 114 using a rotating cylinder viscosimeter.

The viscosity of 2-ethylhexyl 4-methoxycinnamate was measured over a shear rate range from 0 s-1 to 1130 s-1 at 20 °C and from 0 s-1 to 2050 s-1 at 40 °C. The viscosity values did not vary with the shear rate within the limits of accuracy of the instrument. This indicates that 2-ethylhexyl 4-methoxycinnamate is a Newtonian fluid. 2-ethylhexyl 4-methoxycinnamate has a viscosity of 99.80 mPa·s at 20 °C and 31.60 mPa·s at 40 °C.

Description of key information

Viscosity: 99.8 mPa.s at 20 °C.

Key value for chemical safety assessment

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

Additional information

The dynamic viscosity of Ethylhexyl Methoxycinnamate was determined to be 99.8 mPa.s at 20 °C using a rotating cylinder viscosimeter according to OECD guideline 114 under GLP.