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EC number: 680-227-5 | CAS number: 71449-78-0
Density
Administrative data
Link to relevant study record(s)
- Endpoint:
- relative density
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03 December 2018 to 10 June 2019
- 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)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.3 (Relative Density)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Date of Inspection: 21 August 2018 Date of Issue: 19 November 2018
- Type of method:
- air comparison pycnometer (for solids)
- Type:
- density
- Density:
- 1 670 kg/m³
- Temp.:
- 19 °C
- Type:
- relative density
- Density:
- 1.67 other: dimensionless
- Temp.:
- 19 °C
- Conclusions:
- The density of the test item has been determined to be 1.67 x 103 kg/m3 at 19.0 ± 0.5 °C and a relative density of 1.67.
- Executive summary:
The density of the test item was determined to be 1.67 x 103kg/m3 at 19.0 ± 0.5 °C, relative density of 1.67, using a gas comparison pycnometer, designed to be compatible with Method A.3 Relative Density of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 109 of the OECD Guidelines for Testing of Chemicals, 02 October 2012.
Duplicate determinations were performed to ensure a reproducibility of less than ± 20 kg/m3was 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.
Reference
Calibrations
The pressure readings and the calculated volume for the reference and sample cells are shown in the following table:
Table 2
Determination |
P1 |
P2 |
P3 |
P4 |
Reference Cell Volume (cm3) |
Sample Cell Volume (cm3) |
1 |
17.138 |
6.487 |
17.245 |
8.543 |
90.743 |
148.991 |
2 |
17.162 |
6.498 |
17.198 |
8.520 |
90.847 |
149.090 |
3 |
17.194 |
6.511 |
17.105 |
8.475 |
90.862 |
149.083 |
Mean reference cell volume: 90.817 cm3
Mean sample cell volume: 149.055 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 |
Replicate |
P1(sample) |
P2(sample) |
Volume |
Density |
Mean Density (kg/m3) |
1 |
A |
17.094 |
7.470 |
32.1 |
1.68 x 103 |
1.67 x 103 |
B |
17.066 |
7.465 |
32.3 |
1.67 x 103 |
||
C |
17.112 |
7.482 |
32.2 |
1.67 x 103 |
||
2 |
A |
17.126 |
7.498 |
32.4 |
1.68 x 103 |
1.67 x 103 |
B |
17.041 |
7.469 |
32.7 |
1.66 x 103 |
||
C |
17.064 |
7.476 |
32.6 |
1.67 x 103 |
Mean density: 1.67
x 103 kg/m3
Relative density: 1.67
Temperature: 19.0 ± 0.5
°C
Discussion
Duplicate determinations were performed to ensure a reproducibility of less than ± 20 kg/m3was 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
Relative density: 1.67 at 19°C; OECD 109; Fox J M (2019)
Key value for chemical safety assessment
Additional information
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