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Physical & Chemical properties

Density

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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:
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.
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:
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)
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:
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 TBO 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 the the same or sufficiently similar such that application of this read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.