Reaction mass of 2,4-bis(xylylazo)resorcinol and 2,4-bis[(4-dodecylphenyl)azo]resorcinol and 2-[(4-dodecylphenyl)azo]-4-(2,4-xylylazo)resorcinol

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

28 March 2017 - 26 May 2017

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:

no

Type of method:

pycnometer method

Remarks:

Gas comparison pycnometer method

Specific details on test material used for the study:

Identification: C.I. Solvent Yellow 175 Solid
Batch: ZA07202016
Purity: >99%
Expiry date: 18 July 2019
Storage conditions: room temperature in the dark

Key result

Type:

density

Density:

1 060 kg/m³

Temp.:

19.6 °C

Remarks on result:

other: The density of the test item has been determined to be 1.06 x 10^3 kg/m^3 at 19.6 ± 0.5 °C and a relative density of 1.06.

Key result

Type:

relative density

Density:

1.06

Temp.:

19.6 °C

Remarks on result:

other: The test item has a relative density of 1.06.

Calibration:

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

Determination	P1 (psig)	P2 (psig)	P3 (psig)	P4 (psig)	Reference Cell Volume (cm^3)	Sample Cell Volume (cm^3)
1	16.998	6.434	17.015	8.430	90.710	148.937
2	17.008	6.445	17.034	8.442	91.051	149.228
3	16.990	6.438	16.996	8.423	91.047	149.227

Mean reference cell volume   :          90.936 cm³
Mean sample cell volume       :          149.131 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 beakers and test item are shown in the following tables:

Empty Beakers:

Determination	Replicate	P1(sample) (psig)	P2(sample) (psig)	Volume (cm^3)	Mean Volume (cm^3)
1	A	17.023	6.852	14.147	14.110
	B	17.050	6.862	14.118
	C	17.044	8.858	14.066
2	A	17.021	6.859	14.404	14.364
	B	17.039	6.865	14.363
	C	17.012	6.853	14.326

 

Beakers and Test Item:

Determination	Replicate	P1(sample) (psig)	P2(sample) (psig)	Volume (cm^3)	Mean Volume (cm^3)
1	A	17.041	7.315	28.223	28.120
	B	17.038	7.309	28.086
	C	17.092	7.331	28.052
2	A	17.066	7.266	26.481	26.511
	B	17.063	7.266	26.519
	C	17.069	7.269	26.532

 

Determination	Mean Beaker Volume (cm^3)	Mean Beaker and TI Volume (cm^3)	Volume of TI (cm^3)	Density (kg/m^3)
1	14.110	28.120	14.010	1.05 x 10^3
2	14.364	26.511	12.147	1.08 x 10^3

Mean density             :          1.06 x 10³ kg/m³
Relative density         :          1.06
Temperature               :          19.6 ± 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 has been determined to be 1.06 x 10^3 kg/m^3 at 19.6 ± 0.5 °C and a relative density of 1.06.

Executive summary:

Density. 1.06 x 10³ kg/m³ at 19.6 ± 0.5 °C, relative density 1.06, using a gas comparison pycnometer 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.

Description of key information

Density. 1.06 x 10³kg/m³ at 19.6 ± 0.5 °C, relative density 1.06, using a gas comparison pycnometer 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.

Key value for chemical safety assessment

Relative density at 20C:

1.06