# NIOSH Pocket Guide to Chemical Hazards
Silicon carbide | CAS 409-21-2
SiC | RTECS VW0450000
Synonyms & Trade Names Carbon silicide, Carborundum®, Silicon monocarbide | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
OSHA PEL†: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
IDLH N.D. | Conversion
Physical Description Yellow to green to bluish-black, iridescent crystals.
MW: 40.1 | BP: Sublimes | MLT: 4892°F (Sublimes) | Sol: Insoluble
VP: 0 mmHg (approx) | IP: 9.30 eV |  | Sp.Gr: 3.23
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities None reported [Note: Sublimes with decomposition at 4892°F.]
Measurement Methods NIOSH 0500, 0600
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Breathing: Fresh air Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system; cough
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION