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Chemical Sampling Information |
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| Silicon Carbide (Total Dust) |
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General Description
Synonyms: Carbon silicide; Carborundum®; Silicon monocarbide
OSHA IMIS Code Number: 2236
Chemical Abstracts Service (CAS) Registry Number: 409-21-2
NIOSH, Registry of Toxic Effects (RTECS) Identification Number: VW0450000
NIOSH Pocket Guide to Chemical Hazards, Silicon Carbide: chemical description, physical properties, potentially hazardous incompatibilities, and more
Exposure Limits
OSHA Permissible Exposure Limit (PEL) for General Industry: 29 CFR 1910.1000 Z-1 Table -- 15 mg/m3 TWA
OSHA Permissible Exposure Limit (PEL) for Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- 15 mg/m3 TWA
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA; Inhalable fraction; see Appendix C, paragraph A. The value is for particulate matter containing no asbestos and <1% crystalline silica. - 3 mg/m3 TWA; Respirable fraction; see Appendix C, paragraph C. The value is for particulate matter containing no asbestos and <1% crystalline silica. (TLV listed under Silicon carbide, Nonfibrous)
0.1f/cc TWA; Respirable fibers: length >5 m; aspect ratio ≥ 3:1; as determined by the membrane filter method at 400-450X magnification (4-mm objective), using phase-contrast illumination. Appendix A2 - Suspected Human Carcinogen. (TLV listed under Silicon carbide, Fibrous (including whiskers))
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA
Health Factors
Potential symptoms: Irritation of eyes, skin, upper respiratory system, cough
Health Effects: Nuisance particulate-Accumulation in lungs (HE19)
Affected organs: Eyes, skin, respiratory system
Notes: 1) Inhalational studies in rats with silicon carbide dust (20 mg/m3) reported no significant effects on the lungs, in contrast to marked adverse effects of quartz dust. 2) Production of silicon carbide can also involve worker exposure to silicon carbide fibers, crystalline silica, carbon monoxide, sulfur dioxide and small amounts of polycyclic aromatic hydrocarbons. 3) Excess mortality from asthma, emphysema, chronic bronchitis, pneumoconiosis and lung cancer among silicon carbide workers has been reported.
Date Last Revised: 09/26/2005
Literature Basis:
- NIOSH Pocket Guide to Chemical Hazards: Silicon Carbide.
- International Chemical Safety Cards (WHO/IPCS/ILO): Silicon Carbide (non-fibrous).
- Bruch, J., Rehn, B., Song, H., Gono, E. and Malkusch, W.: Toxicological investigations on silicon carbide. 1. Inhalation studies. Br. J. Ind. Med. 50(9): 797-806, 1993.
- Infante-Rivard, C., Dufresne, A., Armstrong, B., Bouchard, P. and Theriault, G.: Cohort study of silicon carbide production workers. Am. J. Epidemiol. 140(11): 1009-1015, 1994.
- Pohanish, R.P. (editor): Silicon Carbide. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 2034-2035.
- Romundstad, P., Andersen, A. and Haldorsen, T.: Non-malignant mortality among Norwegian silicon carbide smelter workers. Occup. Environ. Med. 59(5): 345-347, 2002.
Monitoring Methods used by OSHA
Laboratory Sampling/Analytical Method:
On-Site Sampling Techniques/Methods:
Wipe sampling: No
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Page last updated: 04/11/2006
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