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Physical & Chemical properties

Appearance / physical state / colour

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Endpoint:
appearance / physical state / colour
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
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.
Justification for type of information:
1. HYPOTHESIS FOR THE CATEGORY APPROACH: The hypothesis is that properties are likely to be similar or follow a similar pattern because of the presence of a common metal ion, in this case tungstate.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES):
Source: Tungsten Carbide
Target: RM W2C + WC
3. CATEGORY APPROACH JUSTIFICATION: See Annex 1 in CSR
4. DATA MATRIX: See Annex 1 in CSR
Reason / purpose:
reference to same study
Reason / purpose:
read-across: supporting information
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
Physical state at 20°C and 1013 hPa:
solid
Key result
Form:
crystalline
Colour:
grey
Conclusions:
Based on read across to tungsten carbide, the reaction mass of ditungsten carbide and tungsten carbide (RM of W2C+WC) is a grey/black crystalline solid.
Executive summary:

Due to the similar chemical constituency and structure between the source substance (tungsten carbide) and the target substance (RM of W2C+WC), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.

Endpoint:
appearance / physical state / colour
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
weight of evidence
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.
Justification for type of information:
1. HYPOTHESIS FOR THE CATEGORY APPROACH: The hypothesis is that properties are likely to be similar or follow a similar pattern because of the presence of a common metal ion, in this case tungstate.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES):
Source: Tungsten Carbide
Target: RM W2C + WC
3. CATEGORY APPROACH JUSTIFICATION: See Annex 1 in CSR
4. DATA MATRIX: See Annex 1 in CSR
Reason / purpose:
reference to same study
Reason / purpose:
read-across: supporting information
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
Physical state at 20°C and 1013 hPa:
solid
Key result
Form:
other: hexagonal
Colour:
black
Substance type:
inorganic
Conclusions:
Based on read across to tungsten carbide, the reaction mass of ditungsten carbide and tungsten carbide (RM of W2C+WC) is a grey/black crystalline solid.
Executive summary:

Due to the similar chemical constituency and structure between the source substance (tungsten carbide) and the target substance (RM of W2C+WC), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.

Description of key information

The reaction mass of ditungsten carbide and tungsten carbide (RM of W2C+WC) is a grey/black crystalline solid.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

Due to the similar chemical constituency and structure between the source substance (tungsten carbide) and the target substance (RM of W2C+WC), the physico-chemical properties would be expected to be the same or sufficiently similar such that application of read-across is appropriate for this endpoint. For more details, refer to the attached read-across approach document.