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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:
Experimental start date: 12 January 2016 Experimental completion date: 25 March 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Version / remarks:
The determination was carried out with a gas comparison pycnometer, using a procedure designed to be compatible with Method A3 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.
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
pycnometer method
Dynamic viscosity of test material:
Due to the test item’s viscosity, it was considered that the pycnometer method for liquids would be impractical. Therefore, it was decided to melt (70 °C) and transfer the test item into glass vessels which would fit inside the sample cell of the gas comparison pycnometer. The samples were then equilibrated to 20 °C.
Two determinations were performed to ensure a reproducibility of less than ± 20 kg/m3 was obtained.
Key result
Type:
relative density
Density:
0.994 kg/m³
Temp.:
20 °C
Remarks on result:
other: The density of the test item has been determined to be 994 kg/m3 at 20.0 ± 0.5 °C and a relative density of 0.994.

 Calibration

 

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

 

Table 4

 

Determination

P1

(psig)

P2

(psig)

P3

(psig)

P4

(psig)

Reference Cell Volume (cm3)

Sample Cell Volume (cm3)

1

17.145

6.491

17.188

8.515

90.815

149.059

2

17.144

6.491

17.243

8.542

91.846

149.096

3

17.153

6.494

17.833

8.835

90.798

149.032

 

Mean reference cellvolume  :          90.820cm3Mean samplecellvolume                :          149.062cm3

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

 

 Sample

 

The mass of the vessel, vessel and test item, and the calculated mass of test item are shown in the following table:

 

Table 5

 

Determination

Mass of Vessel (g)

Mass of Vessel and Test Item (g)

Mass of Test Item (g)

1

31.7789

50.2681

18.4892

2

30.8962

50.5644

19.6682

The pressure readings obtained for the vessel and vessel containing test item are shown in the following table:

 

Table 6

 

 

Determination

 

Rep

Vessel

Vessel and Test Item

P1(sample)(psig)

P2(sample)(psig)

Volume(cm3)

P3(sample)(psig)

P4(sample)(psig)

Volume(cm3)

 

1

A

17.133

6.905

14.536

17.154

7.531

33.014

B

17.115

6.896

14.479

17.300

7.597

33.066

C

17.194

6.926

14.420

17.138

7.525

33.043

 

2

A

17.151

6.898

14.071

17.155

7.563

33.878

B

17.197

6.917

14.087

17.166

7.570

33.936

C

17.139

6.892

14.032

17.148

7.561

33.907

 

The calculated volumes and density obtained are shown in the following table:

 

Table 7

 

 

Determination

Mean Volume of Vessel (cm3)

Mean Volume of Vessel and Test Item (cm3)

Volume of Test Item (cm3)

Density (kg/m3)

1

14.478

33.041

18.563

996

2

14.063

33.907

19.844

991

Overall meandensity:          994kg/m3Relativedensity         :          0.994

Temperature               :          20.0 ± 0.5°C

Conclusions:
The density of the test item has been determined to be 994 kg/m3 at 20.0 ± 0.5 °C and a relative density of 0.994
Executive summary:

Density. 0.994 kg/m3 at 20.0 ± 0.5 °C and a relative density of 0.994, using a gas comparison pycnometer, designed to be compatible with Method A3 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

Description of key information

Density. 0.994 kg/m3 at 20.0 ± 0.5 °C and a relative density of 0.994, using a gas comparison pycnometer, designed to be compatible with Method A3 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

Key value for chemical safety assessment

Relative density at 20C:
0.994

Additional information

Due to the test item’s viscosity, it was considered that the pycnometer method for liquids would be impractical. Therefore, it was decided to melt (70 °C) and transfer the test item into glass vessels which would fit inside the sample cell of the gas comparison pycnometer. The samples were then equilibrated to 20 °C.

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