Registration Dossier
Registration Dossier
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EC number: 235-111-5 | CAS number: 12069-32-8
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Remarks:
- Handbook
- Principles of method if other than guideline:
- No data
- GLP compliance:
- not specified
- Type of method:
- other: No data
- Melting / freezing pt.:
- 2 720 K
- Endpoint:
- melting point/freezing point
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Remarks:
- Reliable handbook
- Principles of method if other than guideline:
- No data
- GLP compliance:
- not specified
- Type of method:
- other:
- Melting / freezing pt.:
- 2 623 K
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 3 (not reliable)
- Rationale for reliability incl. deficiencies:
- other: No GLP study. Carbon content not given.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Differential thermal analysis.
- GLP compliance:
- not specified
- Type of method:
- thermal analysis
- Remarks:
- Differential thermal analysis
- Melting / freezing pt.:
- >= 2 450 - <= 2 490 °C
- Decomposition:
- no
- Endpoint:
- melting point/freezing point
- Type of information:
- not specified
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Principles of method if other than guideline:
- No data
- GLP compliance:
- not specified
- Type of method:
- other: No data
- Melting / freezing pt.:
- 2 450 °C
- Decomposition:
- no
- Conclusions:
- The melting point is shown in nowadays accepted phase diagram. As boron carbide shows a homogeneity range of 8.8 to 20 at % C, the maximum at 2450°C corresponds to the compound B13C2 (18.5 at % C).
Referenceopen allclose all
Description of key information
The most accepted value of the melting point of boron carbide is 2450°C. This corresponds to a stoichiometry of B6.5C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 2 450 °C
Additional information
The melting point of boron carbide depends on stoichiometry. Boron carbide has a stoichiometry range of 8.8 to 20 atom% B4C. The most widely used technical grade boron carbide powder manufactured by the carbothermic reduction of boron oxide is B4.3C. The melting point marked in the phase diagram corresponds to B13C2. Thus the melting point of the technical grade powder B4.3C is slightly lower.
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