Registration Dossier
Registration Dossier
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EC number: 231-953-2 | CAS number: 7782-40-3
Explosiveness
Administrative data
- Endpoint:
- explosiveness
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed according to internationally accepted guidelines.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: Screening Test of dust explosibility in the Hartmann tube: VDI2263, sheet 1; test on dust explosibility in the 20 L-sphere: DIN EN 14034-1
- Deviations:
- no
- GLP compliance:
- no
Test material
- Reference substance name:
- Diamond
- EC Number:
- 231-953-2
- EC Name:
- Diamond
- Cas Number:
- 7782-40-3
- Molecular formula:
- C
- IUPAC Name:
- carbon
- Details on test material:
- Test item: Synthetic Diamond Grade 2 (2 micron) Powder
Chemical name: Diamond
CAS No.: 7782-40-3
Batch No.: 135-200-0125-99 E634%CU33%WT33%REACH
Physical state: light grey powder
Purity: > 95 %
Storage conditions: Room temperature, dry
Constituent 1
Results and discussion
Small-scale preliminary testsopen allclose all
- Parameter:
- other: More sensitive to shock than m-dinitrobenzene
- Remarks:
- migrated information
- Remarks on result:
- negative (not further specified)
- Parameter:
- other: More sensitive to friction than m-dinitrobenzene
- Remarks:
- migrated information
- Remarks on result:
- negative (not further specified)
- Parameter:
- other: Explosive under influence of flame
- Remarks:
- migrated information
- Remarks on result:
- not measured/tested
- Parameter:
- other: Explosive (not specified)
- Remarks:
- migrated information
- Remarks on result:
- positive (not further specified)
- Remarks:
- The product is a combustible dust, but the product is only hardly ignitable.
Any other information on results incl. tables
The dust could neither be ignited with a continuous spark nor with the glowing coil as ignition source in the Hartmann apparatus. The extended test in the closed apparatus (20 L explosion vessel) showed a pressure increase above 0.5 bar. The lower explosion limit (LEL) was determined in the closed apparatus (20 l explosion vessel) to be 250 g/m³.
The product is a combustible dust, but the product is only hardly ignitable. From the screening test on dust explosibility in the Hartmann Apparatus it can be derived that the minimum ignition energy (MIE) is >> 10 J. Due to this high minimum ignition energy ignition risk by normal ignition sources especially by electrostatic discharges can be excluded. The risk of dust explosion is limited to strong ignitions sources, e.g. flames and smouldering nests. According to the state of the art combustible bulk material with a minimum ignition energy of more than 4 mJ and even highly ignitable dusts are not ignited by brush discharges (see: German TRBS 2153: „Vermeidung von Zündgefahren infolge elektrostatischer Aufladungen“ vom 19. Februar 2009; Anhang A; Abschnitt A3.3 (Avoidance of risk of ignition by electrostatic discharge)” dated February 2009). The lower explosion limit (LEL) of 250 g/m³ is high compared to other substances. Due to this explosive atmosphere can occur only locally and for a short time.
Due to decomposition behaviour (e.g. decomposition energy < 500 J/g, high starting temperature of decomposition) has not been detected, the hazard of deflagration as well as explosive properties (e.g. impact sensitivity) can be excluded.
Applicant's summary and conclusion
- Interpretation of results:
- non explosive
- Remarks:
- Migrated information
- Conclusions:
- The study on flammability of diamond has shown that diamond itself is not explosive and burns very slowly (see section 4.13 of the dossier). Therefore, a study on explosibility of diamond dust has been performed. The results show that diamond dust is a combustible dust, but the product is only hardly ignitable. Due to the high minimum ignition energy ignition risk by normal ignition sources especially by electrostatic discharges can be excluded. The lower explosion limit (LEL) of 250 g/m³ is high compared to other substances. Due to this explosive atmosphere can occur only locally and for a short time. Due to decomposition behaviour has not been detected, the hazard of deflagration as well as explosive properties (e.g. impact sensitivity) can be excluded.
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