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Physical & Chemical properties

Density

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Reference
Endpoint:
bulk density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2011-11-03
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
GLP compliance:
no
Type of method:
pycnometer method
Key result
Type:
bulk density
Density:
1.23 g/cm³
Temp.:
20 °C
Remarks on result:
other: The temperature inside the pycnometer chamber was approximately 27.4° C (± 2 K). A correction was applied to calculate the density at 20°C.

Table1: Density of TDI-Urone at 27.4°C

Test

 

# 1

# 2

mass [g] *)

 

1.3926

 

1.5372

temperature

run

27.4°C

27.4°C

volume [cm³]

1

2

3

4

5

1.1417

1.1395

1.1346

1.1375

1.1378

1.2499

1.2459

1.2474

1.2488

1.2491

average volume [cm³]

(of last five runs)

1.1382

1.2482

density [g/cm³]

 

1.2235

1.2315

For solid organic compounds the cubic thermal expansion coefficient  is in the range of = 20 - 45 x 10-5K-1(D'Ans Lax, Taschenbuch für Chemiker und Physiker, Band I, 3.Aufl., 1967). Using an average value (mode) of (c)= 30 x 10-5K-1the volume (VT) measured at the temperature of the chamber TCh is extrapolated to the volume (V20°) at 20°C according to the formulae:

V20° = VT-deltaVT-20, and

delta VT-20° = VT.. (TCh-20°)

Since the temperature inside the pycnometer chamber was approximately 27.4° C (± 2 K) a correction was applied to calculate the density at 20°C.

Table 2: Density of TDI-Urone at 20°C

Test

 

# 1

# 2

temperature difference [°C]

TCh– 20°C

7.4

7.4

volume difference [cm³]

for delta T

0.0025

0.0028

corrected volume [cm³]

(20°C)

1.1357

1.2454

density [g/cm³]

(20°C)

1.2262

1.2343

Conclusions:
The relative density of the test substance extrapolated at 20°C is:
ρ20 = 1.230 g/cm³ or 1230 kg/m³ .
Executive summary:

The density of TDI-Urone at 20°C was determined according guideline OECD 109 by gas displacement pycnometry. It was determined to be 1.230 g/cm³ or 1230 kg/m³.

Description of key information

The density of the test substance at 20°C is:
ρ20 = 1.230 g/cm³ or 1230 kg/m³.

Key value for chemical safety assessment

Additional information

There are two literature sources reporting the density of TDI-Urone.

In one study the density of TDI-Urone at 20°C was determined according to Guideline OECD 109 by gas displacement pycnometry. It is reported to be 1.230 g/cm³ or 1230 kg/m³.

Furthermore the density of TDI-Urone is reported in the Safety Data Sheet by Degussa to be 1.04 g/cm³.

The experimental result is chosen as key value because it is more reliable than the value in the SDS.