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Diss Factsheets

Physical & Chemical properties

Density

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Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01 February 2021 - 28 February 2021
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)
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
GLP compliance:
yes
Type of method:
pycnometer method
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source (i.e. manufacturer or supplier): Imerys

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature, in the dark

Key result
Type:
relative density
Density:
2.87
Temp.:
20 °C
Key result
Type:
density
Density:
2 870 kg/m³
Temp.:
20 °C

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


Table 2 Calibration Measurements










































Determination



P1 (psig)



P2 (psig)



P3 (psig)



P4 (psig)



Reference Cell Volume (cm3)



Sample Cell Volume (cm3)



1



17.189



6.512



17.399



8.620



91.056



149.295



2



17.401



6.590



17.406



8.628



90.766



148.903



3



17.340



6.570



17.356



8.603



90.955



149.100



Mean reference cell volume: 90.926 cm3
Mean sample cell volume: 149.099 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 cm3 for 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 Sample Measurements





























































Determination



Replicate



P1(sample)


(psig)



P2(sample)


(psig)



Volume (Cm3)



Density (kg/m3)



Mean Density (kg/m3)



 


1



A



17.067



7.186



24.1



2.87 x 103



 


2.87 x 103



B



17.078



7.189



24.1



2.88 x 103



C



17.107



7.203



24.1



2.87 x 103



 


2



A



17.057



7.179



24.0



2.87 x 103



 


2.87 x 103



B



17.094



7.196



24.0



2.87 x 103



C



17.052



7.178



24.0



2.87 x 103



Mean density: 2.87 x 103 kg/m3
Relative density: 2.87
Temperature: 20.2 ± 0.5 °C


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

Conclusions:
A study was carried out according to OECD TG 109 to determine the relative density of Synthetic wollastonite.
Synthetic wollastonite has a density of 2.87 x 103 kg/m3 at 20.2 ± 0.5 °C and relative density of 2.87.
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
Testing was conducted on 27 July 2010
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)
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Type:
relative density
Density:
2.36
Temp.:
20 °C

Calibration:

The pressure readings (P1and P2) and the calculated volume for the calibration ball are shown in the following table:

Determination

P1

P2

Volume (cm3)

Certified Volume (cm3)

Tolerance

(cm3)

A

17.648

8.738

56.842

56.6

± 0.5

B

17.456

8.644

56.504

56.6

± 0.5

Sample:

The pressure readings, calculated volumes and density values obtained for the test item are shown in the following table:

Determination

P1

P2

Volume (cm3)

Density

(kg/m3)

A

17.282

6.783

8.444

2360.8

B

17.299

6.833

9.914

2363.7

Temperature:            20.0 ± 0.5ºC
Mean density:           2362.2 kg/m3
Relative density:        2.36

Conclusions:
The relative density of the test item has been determined to be 2.36 at 20.0 ± 0.5°C.
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline method, non-GLP
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
GLP compliance:
no
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
0.082
Temp.:
20 °C

Density was measured as 82.42 kg/m3. This result was divided by the density of water at 4 °C (999.9720 kg/m3) to derive the relative density.

Conclusions:
Density was measured as 82.42 kg/m3. This result was divided by the density of water at 4 °C (999.9720 kg/m3) to derive the relative density of 0.082 at 20 Deg c

Description of key information

Synthetic wollastonite has a density of 2.87 x 103 kg/m3 and relative density of 2.87.

Key value for chemical safety assessment

Relative density at 20C:
2.87

Additional information

The relative density of Synthetic Wollastonite was determined in a GLP study according to OECD guideline 109 using a gas comparison pycnometer method (Fox 2021)