NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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. See: IDLH INDEX
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
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Not available.
Important additional information about respirator selection
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