Registration Dossier
Registration Dossier
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EC number: 235-111-5 | CAS number: 12069-32-8
Density
Administrative data
Link to relevant study record(s)
- Endpoint:
- bulk density
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Reliable review article, no data on experimental method provided.
- Principles of method if other than guideline:
- No data
- GLP compliance:
- not specified
- Type of method:
- other: No data
- Type:
- bulk density
- Density:
- 2.51 g/cm³
- Temp.:
- 20 °C
- Endpoint:
- bulk density
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Reliable handbook
- Qualifier:
- according to guideline
- Guideline:
- other: No data
- Deviations:
- not specified
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Type:
- bulk density
- Density:
- 2.51 g/cm³
- Temp.:
- 20 °C
- Conclusions:
- The bulk density of dense boron carbide ceramics according to this handbook is 2.51g/cm3. This is a todays well accepted value for dense sintered boron carbide articles.
- Endpoint:
- density, other
- Type of information:
- calculation (if not (Q)SAR)
- Remarks:
- x-ray density is a calculation method
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: reliable handbook
- Qualifier:
- according to guideline
- Guideline:
- other: No data
- Deviations:
- not specified
- Principles of method if other than guideline:
- The x-ray density is a calculation method, which takes into account the unit cell volume and the number of atoms per unit cell.
- GLP compliance:
- not specified
- Type of method:
- other: x-ray density
- Type:
- other: x-ray density
- Density:
- 2.496 g/cm³
- Temp.:
- 20 °C
- Conclusions:
- The density was calculated from x-ray data. The so called x-ray density is 2.4956 g/cmExp3.
Referenceopen allclose all
Description of key information
The density given in reliable handbooks is the measured value of sintered shapes with a density greater 99.5% of theoretical density. It is 2.5 g/cm-3 from a weight of evidence approach.
Key value for chemical safety assessment
- Relative density at 20C:
- 2.51
Additional information
The bulk density of articles of boron carbide cited in the literature (2.51 g/cm3) should be close to the theoretical value as the shapes are >99% dense. As the amount of free carbon always present in boron carbide shapes as well as in raw powders is within a range of appr. <1% - 4%, the density has no exact value, but is within a range of a few percent.
The x-ray density given in the endpoint study record is appr. 0.01 g/cm3 lower than the value of 2.51 g/cm3 given in the literature for ceramic articles because the stoichiometry of ceramic powders manufactured by the arc melting process is B4.3C, which is richer in boron than the stoichiometry of the sample used for determination of the x-ray density (B4C).
As most powders are manufactured by the arc melting process, the density of 2.51 g/cm3 is appropriate to be used as key value for chemical safety assessment.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
