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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19-03-2019 until 30-04-2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
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:
Test Item Name: 2,2'-MDI (EC Number: 219-799-4)
Substance Name: 2,2'-methylenediphenyl diisocyanate
Batch/ Lot Number: WRS4821
Expiry date: 10/03/2019 storage < 5°C
Temp.:
other: 50°C
Parameter:
kinematic viscosity (in mm²/s)
Remarks on result:
not determinable

Sample was held at 50°C for approximately a 2-hour period and was only partially melted. As the test item was not a homogeneous liquid over this period it was not possible to determine viscosity at temperatures below 50°C.

An attempt was made to see if sample would be homogenous over a prolonged period (5 hours) of heating. Sample was still only partially melted over this time period. Therefore, testing was not possible.

Conclusions:
it was not possible to determine viscosity at temperatures below 50°C.
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 difference between the repeated measurements must not be more than 0.2 seconds.

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 %
T esting Standard : CIPAC method MT 22 1994, reprinted 2007

Apparatus : Viscometer, Thermometer and Stop watch.

Comments

Sample was held at 50°C for approximately a 2-hour period and was only partially melted. As the test item was not a homogeneous liquid over this period it was not possible to determine viscosity at temperatures below 50°C.

An attempt was made to see if sample would be homogenous over a prolonged period (5 hours) of heating. Sample was still only partially melted over this time period. Therefore, testing was not possible.

Description of key information

In a study (DEKRA 2019) the sample was held at 50°C for approximately a 2-hour period and was only partially melted. As the test item was not a homogeneous liquid over this period it was not possible to determine viscosity at temperatures below 50°C.

Key value for chemical safety assessment

Additional information