Tungsten oxide

Density

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

density, other

Remarks:

Density types indicated (migrated information): other: density (WO3); other: density (WO2.98); other: density (WO2.81); other: density (WO2.66); other: density (WO2.51)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

Well documented study with density examination conducted with sound scientific methodology. However, purpose of study went beyond examination of physical characteristics and few details were provided regarding density determination.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Density was determined via helium pycnometry.

GLP compliance:

not specified

Type of method:

pycnometer method

Key result

Type:

density

Remarks:

density (WO3)

Density:

> 7.19 - < 7.21 g/cm³

Temp.:

23 °C

Key result

Type:

density

Remarks:

density (WO2.98)

Density:

> 6.98 - < 7.02 g/cm³

Temp.:

23 °C

Key result

Type:

density

Remarks:

density (WO2.81)

Density:

7.1 g/cm³

Temp.:

23 °C

Key result

Type:

density

Remarks:

density (WO2.66)

Density:

> 8.17 - < 8.23 g/cm³

Temp.:

23 °C

Key result

Type:

density

Remarks:

density (WO2.51)

Density:

> 7.65 - < 7.75 g/cm³

Temp.:

23 °C

Assumed to be conducted at room temperature.

Conclusions:

Density for WO3, WO2.98, WO2.81, WO2.66 and WO2.51 were approximately 7.2, 7.0, 7.1, 8.2 and 7.7 g/cm^3, respectively.

Reference 2

Endpoint:

density, other

Remarks:

Density types indicated (migrated information): density; other: measured density

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

Data from peer-reviewed handbook or collection of data.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.

GLP compliance:

not specified

Type of method:

other: x-ray

Key result

Type:

density

Density:

7.72 - 7.99 g/cm³

Key result

Type:

density

Density:

7.78 g/cm³

Conclusions:

Density = 7.724-7.989 g/cm³ (measured), 7.78 g/cm³ (X-ray); (Relative density = 7724-7989)

Reference 3

Endpoint:

density, other

Remarks:

Density types indicated (migrated information): other: density (x-ray); other: density (measured)

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

Data from peer-reviewed handbook or collection of data.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.

GLP compliance:

not specified

Type of method:

other: x-ray

Key result

Type:

density

Density:

7.16 g/cm³

Temp.:

23 °C

Key result

Type:

density

Density:

7.15 g/cm³

Temp.:

23 °C

Testing assumed to be conducted at room temperature as no data on temperature of test conditions was provided.

Description of key information

Densities for WO3, WO2.98, WO2.81 were approximately 7.2, 7.0 and 7.1 g/cm³, respectively.  Densities of other tungsten oxide forms were in the same range.

Key value for chemical safety assessment

Relative density at 20C:

7

Additional information

Due to the similar chemical constituency and structure, the physico-chemical properties would be expected to be the same or sufficiently similar such that application of this read-across is appropriate for this endpoint. For more details, refer to the read-across category approach description in the Category section of this IUCLID submission or Annex 3 of the CSR.