Tetraethyllead

Viscosity

Link to relevant study record(s)

Reference

Endpoint:

viscosity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: Viscosity of Transparent and Opaque Liquids CTL SOP No. 422

Principles of method if other than guideline:

The method was changed to cover a range of 0.6 – 60000 cSt and with the proviso that kinematic viscosity values were tabulated if results were < 0.6 cSt.

This standard test method does not allow for times of less than 200 seconds to be quoted as a viscosity value and states that it should be a less than value (presumably 200 seconds gives a value of 1.2 cSt). OECD method 114 –“Viscosity” states that the lower limit for viscosity testing is 0.5 mPa.s (dynamic viscosity)

Measurement Range : 0.6 to 300000 cSt
Accuracy : 0.6 % to 1.2 %
Testing Standard : ISO 3104:1994
Apparatus : Viscometer, Thermometer and Stop watch.

GLP compliance:

yes (incl. QA statement)

Type of method:

capillary viscometer (static)

Temp.:

20°C

Parameter:

other: cSt

Value:

< 0.6

Temp.:

40°C

Parameter:

other: cSt

Value:

< 0.6

Full results

Run	Temp (°C)	Time (mins)	Time (secs)	Viscosity (cSt)
1	20	2.38.14	158.14	0.474
2	20	2.31.66	151.66	0.455
3	20	2.33.09	152.59	0.458
4	40	2.06.94	126.94	0.381
5	40	2.16.90	136.90	0.411
6	40	2.07.66	127.66	0.383

Conclusions:

The flow times in all runs was less than 200 secs, therefore the results have been reported as:

At 20°C < 0.60 cSt (mean of 2 runs)
At 40°C < 0.60 cSt (mean of 2 runs)

Based on full results kinematic viscosity:
At 20°C = 0.4565 cSt
At 40°C = 0.382 cSt

Using density of 1.653 kg/l, dynamic viscosity is calculated as:

0.755 cP @ 20°C
0.631 cP @ 40°C

Executive summary:

The method used was changed to allow a range of 0.6 – 60000 cSt, and with the proviso that kinematic viscosity values were tabulated if results were < 0.6 cSt.

 

The standard test method does not allow for times of less than 200 seconds to be quoted as a viscosity value and states that results be quoted as a less than value if necessary. OECD method 114 –“Viscosity” states that the lower limit for viscosity testing is 0.5 mPa.s (dynamic viscosity).

 

As such time values are included in the final report.

Testing was actually done to determine kinematic viscosity. Dynamic viscosity is calculated based on kinematic viscosity x density (which for TEL is 1.653g/cm³at 20°C)

 

Description of key information

Kinematic viscosity test results have been reported as:
At 20°C < 0.60 cSt (mean of 2 runs)
At 40°C < 0.60 cSt (mean of 2 runs)
Based on full results kinematic viscosity:
At 20°C = 0.4565 cSt
At 40°C = 0.382 cSt
Using density of 1.653 kg/l, dynamic viscosity is calculated as:
0.755 cP @ 20°C
0.631 cP @ 40°C

Key value for chemical safety assessment

Viscosity:

0.755 mPa · s (dynamic)

at the temperature of:

20 °C

Additional information

The method used was changed to allow a range of 0.6 – 60000 cSt, and with the proviso that kinematic viscosity values were tabulated if results were < 0.6 cSt.

 

The standard test method does not allow for times of less than 200 seconds to be quoted as a viscosity value and states that results be quoted as a less than value if necessary. OECD method 114 –“Viscosity” states that the lower limit for viscosity testing is 0.5 mPa.s (dynamic viscosity).

 

As such time values are included in the final report.

Testing was actually done to determine kinematic viscosity. Dynamic viscosity is calculated based on kinematic viscosity x density (which for TEL is 1.653g/cm³at 20°C)