Zirconium oxide, erbium and yttrium doped

Density

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10 June 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

other: read-across target

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

2012

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

air comparison pycnometer (for solids)

Key result

Type:

relative density

Density:

5.985 other: dimensionless

Temp.:

20.5 °C

Remarks on result:

other: Mean relative density and mean temperature based on 2 assays.

Detailed results of the two assays are given below. Note that Assay No. 1 was not taken into account, as the pressure values obtained were not stable and not reliable.

Assay No. 2

Test material sample weight: 17.6691 g

Reference volume: 79.250 cm^3

Volume of the sample holder: 27.636 cm^3

Temperature during the assay: 20.7 °C

Data	P2 (PSIG)	P3 (PSIG)	VP (cm^3)	Density (g/cm^3)	Relative density	Mean relative density
Run no. 6	17.039	4.047	2.9497	5.9902	5.9903	5.987 ± 0.005
Run no. 6	17.035	4.046	2.9501	5.9894	5.9895
Run no. 7	17.037	4.046	2.9539	5.9817	5.9818

Runs 1-5 were not taken into account because they did not comply with the quality criterion.

The relative density of the test material in assay No. 2 was 5.987 ± 0.005 at 20.7 °C.

Assay No. 3

Test material sample weight: 17.4810 g

Reference volume: 79.250 cm^3

Volume of the sample holder: 27.636 cm^3

Temperature during the assay: 20.3 °C

Data	P2 (PSIG)	P3 (PSIG)	VP (cm^3)	Density (g/cm^3)	Relative density	Mean relative density
Run no. 3	17.248	4.100	2.9231	5.9803	5.9804	5.983 ± 0.002
Run no. 4	17.104	4.066	2.9213	5.9840	5.9842
Run no. 5	17.024	4.047	2.9211	5.9843	5.9845

Runs 1-2 were not taken into account because they did not comply with the quality criterion.

The relative density of the test mateiral in assay No. 3 was 5.983 ± 0.002 at 20.3 °C.

Based on the results of assay No. 2 and 3, the mean relative density was calculated to be 5.985 ± 0.004 at 20.5 °C.

Conclusions:

The mean relative density of the test material was determined to be 5.985 ± 0.004 at 20.5 °C.

Executive summary:

The relative density of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 109 and EU Method A.3, under GLP conditions, following the gas comparison pycnometer method.

Under the conditions of the study the mean relative density of the test material was calculated to be 5.985 ± 0.004 at 20.5 °C.

Reference 2

Endpoint:

relative density

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study conducted on read-across material

Justification for type of information:

Read-across to structurally similar substance erbium, gadolinium, yttrium and zirconium oxide (EC 946-001-8). The only difference between the substance being registered and the read-across substance is that the substance to be registered is missing the gadolinium oxide content (about 1.4 %). The absence of this compound at such a low % is considered highly unlikely to affect its properties.

Reason / purpose for cross-reference:

read-across source

Key result

Type:

relative density

Density:

5.985 other: dimensionless

Temp.:

20.5 °C

Remarks on result:

other: Mean relative density and mean temperature based on 2 assays.

Description of key information

Read-across to the structurally similar substance erbium, gadolinium, yttrium and zirconium oxide (EC 946-001-8)

The mean relative density of the test material was determined to be 5.985 ± 0.004 at 20.5 °C.

Key value for chemical safety assessment

Relative density at 20C:

5.985

Additional information

The relative density of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 109 and EU Method A.3, under GLP conditions, following the gas comparison pycnometer method.

Under the conditions of the study the mean relative density of the test material was calculated to be 5.985 ± 0.004 at 20.5 °C.

The study was conducted on the structurally similar substance erbium, gadolinium, yttrium and zirconium oxide (EC 946-001-8). The only difference between the substance being registered and the read-across substance is that the substance to be registered is missing the gadolinium oxide content (about 1.4 %). The absence of this compound at such a low % is considered highly unlikely to affect its properties.