1,1'-methylenebis(4-isocyanatobenzene) and its oligomeric reaction products with butane-1,3-diol, 2,2'-oxydiethanol and propane-1,2-diol

Viscosity

Link to relevant study record(s)

Reference

Endpoint:

viscosity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28/01/2019 - 20/03/2019

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:

Test Item Name: 4,4'-MDI / 1,3 BD / DEG / PG (EC Number: 701-173-1)
Substance Name 1,1'-methylenebis(4-isocyanatobenzene) and its oligomeric reaction products with butane-1,3-diol, 2,2'-oxydiethanol
and propane-1,2-diol
Description: Brown liquid
Batch/ Lot Number: 02533
Expiry date: 15/05/2019 at RT

Key result

Temp.:

20°C

Parameter:

kinematic viscosity (in mm²/s)

Value:

ca. 1 098

Remarks on result:

other: mean of 2 runs

Key result

Temp.:

40°C

Parameter:

kinematic viscosity (in mm²/s)

Value:

ca. 179.1

Remarks on result:

other: mean of 2 runs

An attempt was made to test at 20°C with viscometer size 5, but the flow time was greater than 1 hour. Therefore to ensure temperature control over the test period was consistent, a larger viscometer size was used.

Conclusions:

At 20°C 1098 mm2.s-1(mean of 2 runs) At 40°C 179.1 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 %
T esting Standard : CIPAC method MT 22 1994, reprinted 2007

Apparatus : Viscometer, Thermometer and Stop watch.

Result:

At 20°C 1098 mm2.s-1(mean of 2 runs) At 40°C 179.1 mm2.s-1(mean of 2 runs)

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 (2009). 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) 217 Cst; at 40°C (mean of 2 runs) 58 Cst

 

Key value for chemical safety assessment

Viscosity:

217 mPa · s (dynamic)

at the temperature of:

20 °C