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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Appearance / physical state / colour

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Administrative data

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Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Statement on appearance taken from a Klimisch 1, GLP study on physico-chemical properties of this material
Qualifier:
no guideline followed
Principles of method if other than guideline:
Statement on appearance taken from a Klimisch 1, GLP study on the physico-chemical properties of this material.
GLP compliance:
no
Physical state at 20°C and 1013 hPa:
solid
Form:
powder
Colour:
black
Odour:
other: Not stated
Substance type:
inorganic
Conclusions:
Dirhodium trioxide is a black powder.
Executive summary:

Information on the appearance of dirhodium trioxide is taken from the test material section of a GLP-compliant report on the physico-chemical properties of the test item (Tremain and Atwal 2011) and is considered adequate for use as a key study.

Dirhodium trioxide is a black powder.

Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
Not reported
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Form:
solid: crystalline
Remarks:
Hexagonal crystals
Colour:
Grey
Odour:
other: No data
Substance type:
other: Not stated
Conclusions:
At 20°C and 1013 hPa dirhodium trioxide is grey hexagonal crystals.
Executive summary:

This information is taken from a reliable, peer-reviewed handbook (Lide 2008) and can be considered suitable for use as the key study for this endpoint. At 20°C and 1013 hPa dirhodium trioxide is grey hexagonal crystals.

Description of key information

Dirhodium trioxide is a black powder.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid
Form:
solid: particulate/powder
Colour:
black

Additional information

Information on the appearance of dirhodium trioxide is taken from the test material section of a GLP-compliant report on the physico-chemical properties of the test item (Tremain and Atwal 2011) and is considered adequate for use as a key study. Dirhodium trioxide is a black powder.

This is supported by information taken from a reliable, peer-reviewed handbook (Lide 2008) which is considered suitable for use as a supporting study for this endpoint. At 20°C and 1013 hPa dirhodium trioxide is grey hexagonal crystals.