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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25/02/2019 - 20/08/2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Qualifier:
according to guideline
Guideline:
ISO 3104 (Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity)
Version / remarks:
1994
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary viscometer (static)
Standard covering the apparatus used:
CIPAC method MT 22 1994, reprinted 2007
Specific details on test material used for the study:
Substance Name: Reaction products of 1,1'-methylenebis(4-isocyanatobenzene) with 2,2'-[(methylethylene)bis(oxy)]di(methylethanol), butane- 1,3-diol and propane-1,2-diol
Batch/ Lot Number: LLC1800006
Description: Yellowish liquid
Expiry date: 10/06/2019 storage at RT



Key result
Temp.:
20°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
1 184
Remarks on result:
other: mean of 2 runs
Key result
Temp.:
40°C
Parameter:
kinematic viscosity (in mm²/s)
Value:
190.5
Remarks on result:
other: mean of 2 runs

Results of test runs 1 & 2 at 20°C were found to be outside acceptable tolerance for repeatability, therefore a 3rdtest run was performed. The result at 20°C has been reported as the mean of test runs 2 and 3.

Test run 1 provided a result of 1624 mm2.s-1(flow time of 412.22 seconds).

Conclusions:
At 20°C 1184 mm2.s-1 (mean of 2 runs)
At 40°C 190.5 mm2.s-1 (mean of 2 runs)
Executive summary:

Test Objective and Information

To determine the viscosity of a fluid.
The test is conducted in accordance with ISO 3104:1994 and OECD Test Guideline 114.

Test Method

The viscometer is charged with sample to the upper charging mark with precaution, so that the walls above the mark are not made wet by sample. Sample is then allowed to flow in an unbroken column through the capillary to about 5 mm below the lower charging mark. The flow is stopped by closing the timing tube and more sample added to make up to the mark. The viscometer is then allowed to attain temperature equilibrium, and then the timing tube is opened to allow the sample to flow to the lower charging mark. The tube is closed again and the upper level of the sample is adjusted by adding or removing sample.

The timing tube is opened to allow the liquid to flow under its own head. The time, to within 0.2 seconds, is measured as the sample transverse the tube from the bottom of the lower timing mark to the upper timing mark. Liquid surface is taken as the uppermost portion of the advance liquid.

The viscometer is cleaned with a suitable solvent, dried, then refilled and flow time measurement is repeated.

The kinematic viscosity of the specimen for each run is then obtained from the expression Kinematic viscosity = Ct (mm2.s-1)

Where:C = Constant of the viscometer, t = Flow time in seconds.

Measurement Range: 1.2 to 300000 mm2.s-1
Accuracy: 0.6 % to 1.2 %
Testing standard: CIPAC method MT 22 1994, reprinted 2007

Apparatus: Viscometer, Thermometer and Stop watch.

Description of key information

All substances of the MDI category except the monomeric MDI substances are liquid at room temperature. The kinematic viscosities are broadly consistent due to the presence of a relatively high concentration of mMDI.  All the other substances of the MDI category are liquid at room temperature. The kinematic viscosities are broadly consistent due to the presence of a relatively high concentration of mMDI. A supporting study was performed at Chilworth (2015). A new study to determine the viscosity of the substance was performed at Dekra (2019). The test is conducted in accordance with ISO 3104:1994 and OECD Test Guideline 114 and gave the following results:


At 20°C (mean of 2 runs) 1184 Cst; at 40°C (mean of 2 runs) 191 Cst


 

Key value for chemical safety assessment

Viscosity:
1 184 mm²/s (static)
at the temperature of:
20 °C

Additional information

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