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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25 April 2007 to 23 August 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
air comparison pycnometer (for solids)
Type:
relative density
Density:
1.54 g/cm³
Temp.:
24.5 °C

Two test series with different weights were performed at ambient temperature (24.5 °C).

1strun

Weight 12.4672 g

p1 / psi

p2 / psi

Volume / cm3

DensityρPR/ g / cm3

1. measurement

19.575

11.268

8.0423

1.5502

2. measurement

19.540

11.245

8.0592

1.5470

3. measurement

19.540

11.241

8.0828

1.5424

Mean

 

 

8.0614

1.5465

 

2ndrun

Weight 12.5925 g

p1 / psi

p2 / psi

Volume / cm3

DensityρPR/ g / cm3

1. measurement

19.608

11.263

8.1835

1.5388

2. measurement

19.627

11.275

8.1771

1.5400

3. measurement

19.514

11.208

8.1894

1.5377

Mean

 

 

8.1833

1.5388

 

Mean density ρPR for the two test series: 1.543 g/cm3

Relative density (compared to water at 4°C) D4R:

D4R= ρPR/ ρW4= 1.543 g/cm3/ 1.000 g/cm3= 1.54

Conclusions:
The relative density (compared to water at 4°C) is DR4 = 1.54
Executive summary:

The purpose of this study was the determination of relative density of the test item according to the consolidated version of Council Directive67/548/EEC Annex V (Council Directive 92/69/EEC),Part A: Methods for the determination of physico-chemical properties, A.3. Density of liquids and solids and OECD test guideline OECD 109 (1995)Density of liquids and solids.The study was performed in accordance with the Principles of Good Laboratory Practice (GLP) and reported with a valid GLP certificate.

 

The density of a solid in any form can be measured at ambient temperature (R) with the gas comparison pycnometer. Before the measurement the apparatus with test item was swept with 19.5 psi Helium for 10 times. Thereby a certain amount of gas (Helium, purity min. 99.99 %) was expanded from the volume with the test item (V1=36.31cm3)into an additional volume (V2=20.84cm3). From the pressure drop from p1 to p2 the volume of the test item can be calculated. For the calculation of density a mass measurement was taken before performing the volume measurement.

 

The relative density (compared to water at 4°C) is DR4= 1.54

Description of key information

The relative density (compared to water at 4°C) is DR4= 1.54

Key value for chemical safety assessment

Relative density at 20C:
1.54

Additional information

The relative density of the test item was determined according to methods A.3. Density of liquids and solids and OECD test guideline OECD 109 (1995) Density of liquids and solids.

The density of a solid in any form can be measured at ambient temperature (R) with the gas comparison pycnometer. Before the measurement the apparatus with test item was swept with 19.5 psi Helium for 10 times. Thereby a certain amount of gas (Helium, purity min. 99.99 %) was expanded from the volume with the test item (V1=36.31cm³) into an additional volume (V2=20.84 cm³). From the pressure drop from p1 to p2 the volume of the test item can be calculated. For the calculation of density a mass measurement was taken before performing the volume measurement.

 The relative density (compared to water at 4°C) is DR4= 1.54