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EC number: 200-073-0 | CAS number: 50-97-5
Density
Administrative data
Link to relevant study record(s)
- 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
- Guideline:
- OECD Guideline 109 (Density of Liquids and Solids)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.3 (Relative Density)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- 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
- 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.
Reference
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.
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.
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