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Appearance / physical state / colour

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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:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
no guideline followed
Principles of method if other than guideline:
visual inspection
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Form:
powder
Colour:
yellow
Odour:
odourless
Substance type:
inorganic
Conclusions:
The test item in an inorganic, yellow, odourless powder
Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1991-07-04 to 1991-07-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
no guideline followed
Principles of method if other than guideline:
Methods/Investigations
- Visual inspection
- Characterization by OES with spark source
- Loss on drying: sample amount approx. 2 g
- Quantitative element determination by atom-spectrometry: Sodium and potassium determination by atomic absorption spectrometer; Zr, Si, Pr and Al by ICP-OES
GLP compliance:
yes
Physical state at 20°C and 1013 hPa:
solid
Form:
powder
Colour:
yellow
Odour:
odourless
Substance type:
inorganic
Conclusions:
The test substance is an inorganic, yellow, odourless, ceramic powder containing the following metal oxides: ZrO2 (56.7 %), SiO2 (31.0 %), Pr2O3 (4.5 %), Na2O (0.81 %) and Al2O3 (0.19 %)

Appearance: yellow solid
Homogeneity: The test substance is homogenous by visual inspection
Main components: Zr, Si
Weight loss on drying: 0.8 mg/g
Sodium and potassium determination by atomic absorption spectrometer: Na-content is 6 mg/g and K-content is <1mg/g
Zr, Si, Pr and Al by ICP-OES: Al-content is 1 mg/g, Pr-content is 38 mg/g, Si-content is 145 mg/g and Zr-content is 420 mg/g

Description of key information

The test substance is an inorganic, yellow, odourless, powder.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information