Iron titanium pseudobrookite

Density

Link to relevant study record(s)

Reference

Endpoint:

density, other

Remarks:

true density and relative density

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Remarks:

results obtained with the reference substances, used for calibration or comparison, were not stated

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

2012

Deviations:

yes

Remarks:

results obtained with the reference substance, used for calibration or comparison, were not stated

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2008

Deviations:

yes

Remarks:

results obtained with the reference substances, used for calibration or comparison, were not stated

Principles of method if other than guideline:

The true density of the sample was determined using a helium stereopycnometer. The technique is based on the determination of the true volume that the powder occupies by means of the difference between the cell volume and the volume that the helium occupies that is introduced to complete the cell filling. True density is calculated taking into account the mass of the powder used. The cell used for the density determination was the so-called Large cell, with a volume of 135 cm³.
The sample was dried in a laboratory oven at a temperature of 110 °C for at least two hours and then placed in a desiccator, before testing, to reach room temperature.
Before proceeding with the sample density measurement, the proper functioning of the instrument was verified using micronized zirconium oxide as standard, which allows measurement traceability to be assured.

GLP compliance:

no

Type of method:

air comparison pycnometer (for solids)

Remarks:

helium stereopycnometer

Dynamic viscosity of test material:

Not applicable - the test item is a solid

Key result

Type:

density

Density:

4.25 g/cm³

Temp.:

20 °C

Remarks on result:

other: St.dev. 0.040 g/cm³; relative density: 4.25

The average density obtained for the pigment, in addition to the associated measurement error and the standard deviation of the different values obtained, is 4250 ± 40 kg/m³.

 

Observations:

In order to calculate sample relative density D²⁰₄, the value of the density of water at 4 °C was looked up in the literature*, this being 0.999975 g/cm³. It is assumed that sample density at 20 °C does not differ more than the own measurement error. The quotient between the value of sample density at 20 °C and the value of water at 4 °C, both expressed in the same units, is the relative density D²⁰₄= (4.25 g/cm³) / (0.999975 g/m³) = 4.25

*Handbook of Chemistry and Physiks, Lide, D.R.

Conclusions:

The true density of the test item was determined to be 4250 kg/m³ ± 40 kg/m³ by a helium stereopycnometer. The relative density of the test item was calculated to be 4.250.

Description of key information

The true density of the test item was determined to be 4250 kg/m³ ± 40 kg/m³ by a helium stereopycnometer. The relative density of the test item was calculated to be 4.250.

Key value for chemical safety assessment

Relative density at 20C:

4.25