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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:
Experimental Starting Date: 21 July 2015. Experimental Completion Date: 11 November 2015.
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
GLP compliance:
yes (incl. QA statement)
Type of method:
air comparison pycnometer (for solids)
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: 150324
- Expiration date of the lot/batch: 24 March 2016
Type:
density
Density:
2 810 kg/m³
Temp.:
20.8 °C
Key result
Type:
relative density
Density:
2.81
Temp.:
20.8 °C

- Calibration

Pressure readings and the calculated volume for the reference and sample cells

Determination

P1(psig)

P2(psig)

P3(psig)

P4 (psig)

Reference Cell Volume (cm3)

Sample Cell Volume (cm3)

1

17.047

6.454

17.179

8.512

90.771

148.983

2

17.541

6.644

17.176

8.512

90.892

149.074

3

17.095

6.476

17.075

8.459

91.050

149.299

Mean reference cell volume : 90.904 cm3

Mean sample cell volume : 149.118 cm3

 

As the reference cell volume and sample cell volume were within the defined tolerance (90.953 ± 1.0 cm3 and 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

Determination

Test

P1(sample)

(psig)

P2(sample)

(psig)

Volume (cm3)

Density (kg/m3)

Mean Density (kg/m3)

1

A

17.0958

6.999

17.990

2.864 x 103

2.803 x 103

B

17.133

7.031

18.509

2.784 x 103

C

18.025

7.402

18.657

2.762 x 103

2

A

17.071

7.121

22.100

2.903 x 103

2.820 x 103

B

17.127

7.176

23.061

2.782 x 103

C

17.178

7.199

23.110

2.776 x 103

Mean density : 2.81 x 103kg/m3

Relative density : 2.81

Temperature : 20.8 ± 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.

Conclusions:
The density of the test item was assessed in accordance with OECD Guideline 109 and determined to be 2.81E+03 kg/m3 at 20.8 ± 0.5 °C with a relative density of 2.81.
Executive summary:

GUIDELINE

Density was determined using a gas comparison pycnometer and a method 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.

RESULTS

The density of the test item was determined to be 2.81E+03 kg/m3 at 20.8 ± 0.5°C with a relative density of 2.81

Description of key information

 The density of the test item was assessed in accordance with OECD Guideline 109 and determined to be 2.81E+03 kg/m3 at 20.8 ± 0.5 °C with a relative density of 2.81.

Key value for chemical safety assessment

Relative density at 20C:
2.81

Additional information

No additional information.

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