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Chemical Sampling Information (CSI)
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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 of Chemical Substances (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):

General Industry: 29 CFR 1910.1000 Z-1 Table -- 15 mg/m3 TWA

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.

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. 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.

Date Last Revised: 09/26/2005

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

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