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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
December 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study according to OECD guideline under Internal management system, certificate of analysis included in the report.
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Version / remarks:
Adopted May 12, 1981
Deviations:
no
GLP compliance:
no
Remarks:
Internal management system
Type of method:
rotational viscometer (dynamic)
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
4.7
Temp.:
other: 25.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
3.7
Temp.:
other: 30.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
3.2

The rheometer was calibrated at 13-12-2011.
A calibration check was performed prior to the measurement . The estimated accuracy is ± 1%.

Viscosity measurement of the REACH test substance

Table 1: measured viscosities at 5.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

1.32

3000

285

 

2.64

 

201

148

6.6

 

128

85.0

13.2

 

108

63.0

26.4

 

105

44.2

66

 

 

38.4

 

Table 2: measured viscosities at 10.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

6.6

280

 

 

13.2

145

42.6

38.7

26.4

83.2

30.9

28.6

66

 

23.3

21.5

132

 

21

19

 

Table 3: measured viscosities at 15.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

66

15.5

12.5

11.8

132

12.7

10.7

10.2

 

Table 4: measured viscosities at 20.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

66

4.7

4.7

4.6

132

4.8

4.6

4.6

 

 

Table 5: measured viscosities at 25.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

66

3.7

3.7

3.7

132

3.7

3.6

3.7

 

Table 6: measured viscosities at 30.0°C

Shear rate [1/s]

Viscosity [mPa.s]

after 0 hour

after 1 hour

after 2 hours

66

3.2

3.2

3.2

132

3.2

3.2

3.2

 

Conclusions:
The viscosity of the test substance was determined according to OECD Guideline 114.
The viscosity of the test substance is 4.7 mPa.s at 20°C and 3.2 mPa.s at 30°C.

Below 20°C the test substance behaved like a non-Newtonian liquid (a pseudoplastic liquid), i.e. the viscosity decreased at higher shear rates. Next to that the viscosity was time dependent below 20°C.

The test substance behaved like a Newtonian liquid at and above 20°C, i.e. the viscosity was independent of the shear rate. Also the viscosity did not change in time.
Executive summary:

The viscosity of Trigonox 301 (CAS 26748 -23 -0) was determined according to OECD Guideline 114 , and in accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008.

 

The viscosity of the test substance is 4.7 mPa.s at 50 rpm (20 oC)

 

Description of key information

The viscosity of the test substance was determined according to OECD Guideline 114 and is  4.7 mPa.s at 20°C and 3.2 mPa.s at 30°C.

Key value for chemical safety assessment

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

Additional information