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Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07 June 2018 to 10 July 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in accordance with GLP
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
Date of Inspection: 18 July 2017 - 20 July 2017 Date on Certfiicate: 28 November 2017
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
1.24 other: relative density is dimensionless
Temp.:
20.2 °C

Calibration

The pressure readings and the calculated volume for the reference and sample cells are shown in the following table:

Table 2

Determination

P1(psig)

P2(psig)

P3(psig)

P4(psig)

Reference volume (cm3)

Sample cell volume (cm3)

1

17.003

6.437

17.127

8.485

90.793

149.032

2

17.531

6.640

17.379

8.612

90.900

149.095

3

17.602

6.669

17.161

8.504

91.021

149.218

Mean reference cell volume: 90.905 cm3

Mean sample cell volume: 149.115 cm3

As the reference cell volume and sample cell volume were within the defined tolerance (90.953 ± 1.0 cm3and 149.225 ± 1.0 cm3for the reference and sample cell volumes respectively) the gas comparison pycnometer was therefore considered acceptable for use.

Sample

The pressure readings, calculated volumes and density values obtained for the test item are shown in the following table:

Table 3

Determination

Test

P1 (sample)(psig)

P2 (sample)(psig)

Volume (cm3)

Density (kg/m3)

Mean density (kg/m3)

 

1

A

17.114

6.766

10.084

1.256 x 103

 

 

1.240 x 103

B

17.268

6.833

10.290

1.231 x 103

C

17.108

6.769

10.267

1.234 x 103

 

2

A

18.139

7.146

9.272

1.239 x 103

 

 

1.233 x 103

 

B

17.530

6.908

9.336

1.230 x 103

C

17.555

6.918

9.341

1.230 x 103

 

Mean density: 1.240 x 103(kg/m3)

Relative density: 1.24

Temperature:20.2 ± 0.5 °C

 

Discussion

Duplicate determinations were performed to ensure a reproducibility of less than ± 20 kg/m3 was obtained.

The mass density of a substance varies with temperature and pressure and this variance is typically negligible for solids. Increasing the temperature of a substance may decrease its density by increasing the volume of that substance. Typical thermal expansion coefficients of solids are in the order of 10-5°C-1, and the volumetric expansion of stainless steel (used as calibration spheres) at 20 °C is approximately 5.2 x 10-5°C-1. Therefore, a change in temperature of several degrees will have no significant effect on the volume and hence the density of a solid substance. Therefore, it was considered that the difference in temperature between 20.0 °C and normal laboratory conditions did not have a significant effect on the determined density, and therefore the calculated relative density.

Conclusions:
The density of the test item has been determined to be 1.24E03 kg/m3 at 20.2 ± 0.5 °C (relative density: 1.24).
Executive summary:

The density of the test item has been determined to be 1.24E03 kg/m3 at 20.2 ± 0.5 °C (relative density: 1.24), using a gas comparison pycnometer, designed to be compatable with Method A.3 Relative Density of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 109 of the OECD Guidelines for Testing of Chemicals, 02 October 2012 and Method 830.7300 of the OCSPP Guidelines.

Description of key information

The density of the test item has been determined to be 1.24 x 103 kg/ m3 at 20.2 ± 0.5 °C (relative density: 1.24)

Key value for chemical safety assessment

Relative density at 20C:
1.24

Additional information

The density of the test item has been determined to be 1.24 x 103 kg/ m3 at 20.2 ± 0.5 °C (relative density: 1.24), using a gas comparison pycnometer, designed to be compatable with Method A.3 Relative Density of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 109 of the OECD Guidelines for Testing of Chemicals, 02 October 2012 and Method 830.7300 of the OCSPP Guidelines.