Cerium dioxide

Appearance / physical state / colour

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2005 and 2006

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The description of the substance comes from experimental study reports on other physico-chemical endpoints tested in accordance with GLP. The substance is adequately defined (with certificate of analysis). No specific test guideline is required.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline required

Principles of method if other than guideline:

Visual inspection

GLP compliance:

yes (incl. QA statement)

Physical state at 20°C and 1013 hPa:

solid

Key result

Form:

powder

Colour:

white ivory to creamy white-pale beige

Substance type:

inorganic

Conclusions:

The substance Cerium dioxide is an inorganic solid appearing under the form of a white ivory to creamy white-pale beige powder at ambient temperature and pressure.

Executive summary:

The substance Cerium dioxide was tested for particle size distribution, auto flammability, flammability, explosiveness and oxidising properties under GLP compliance. In this context, the appearance of the sample was described, indicating that cerium dioxide is a white ivory to creamy white/pale beige powder.

Reference 2

Endpoint:

appearance / physical state / colour

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

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline required

Principles of method if other than guideline:

Visual inspection

GLP compliance:

no

Physical state at 20°C and 1013 hPa:

solid

Colour:

Brown-white

Substance type:

inorganic

Conclusions:

The substance Cerium dioxide is an inorganic solid appearing under the form of a brown to white powder.

Reference 3

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

; the information on the appearance of the substance is just cited in the review article without further information on the described sample.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline required

Principles of method if other than guideline:

visual inspection

GLP compliance:

no

Physical state at 20°C and 1013 hPa:

solid

Form:

powder

Colour:

White, yellow (usually) or tan

Substance type:

inorganic

Conclusions:

The substance Cerium dioxide is an inorganic solid appearing under the form of a white, yellow or tan powder.

Reference 4

Endpoint:

appearance / physical state / colour

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

; the information on the appearance of the substance is just cited in the review article without further information on the described sample.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline required

Principles of method if other than guideline:

Visual inspection

GLP compliance:

no

Physical state at 20°C and 1013 hPa:

solid

Colour:

Pale-yellow, white when pure, commercial product is brown

Substance type:

inorganic

Conclusions:

The substance Cerium dioxide is an inorganic solid appearing under the form of a white, pale-yellow or brown powder.

Description of key information

The bulk form of cerium dioxide is described as an inorganic solid appearing under the form of a white ivory to creamy white-pale beige powder at ambient temperature and pressure.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

solid

Additional information

Two experimental studies, dealing with other physico-chemical endpoints but reporting description of the bulk form of cerium dioxide, are available and selected as key studies (pooled in one endpoint study record). A reference handbook and two publications, all selected as supporting studies, give consistent information, with further details on the colour.