SILICON
SYNONYMS:
EINECS
No. 231-130-8; ELEMENTAL SILICON; SILICIO (Spanish); SILICIUM (French, German)
IDENTIFICATION:
CAS:
7440-21-3
DOT ID:
UN1346
Hazard Class or Division:
4.1 (FLAMMABLE SOLID)
ERG Guide:
170
(amorphous powder)
Formula:
Si
RTECS No:
VW0400000
Properties:
Combustible
in powder form. Lustrous black to gray needle-like crystals; amorphous form is
a dark-brown powder.
Uses:
Electronics,
integrated circuits
HEALTH & SAFETY INFORMATION
•
OSHA Table Z-1 Air Contaminant
•
OSHA Specifically Regulated Substances (29 CFR 1910.1001-1048)
•
Long term or repeated exposures with dust can cause silicosis, an irreversible
lung disease.
Exposure Limits:
•
ACGIH TLV: 10 mg/m3 TWA
•
NIOSH REL: 10 mg/m3 (total); 5 mg/m3 (respirable fraction) TWA
•
OSHA PEL: 15 mg/m3 (total); 5 mg/m3 (respirable fraction)
Respirator:
At
any concentrations above the NIOSH REL, or where there is no REL, at any
detectable concentration:
SCBAF:PD,PP
(any self-contained breathing apparatus that has a full facepiece and is
operated in a pressure-demand or other positivepressure mode) SAF:PD,PP:ASCBA
(any suppliedair respirator that has a full facepiece and is operated in a
pressure-demand or other positive-pressure mode in combination with an
auxiliary self-contained breathing apparatus operated in a pressure-demand or
other positive-pressure mode).
Escape:
GMFOV [any airpurifying,
full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted
organic vapor canister] SCBAE (any appropriate escape-type, selfcontained
breathing apparatus).
Reactivity:
Reacts
with chlorine, fluorine, oxidizers, calcium, cesium carbide, and alkaline
carbonates.
FIRE INFORMATION
Flammable
solid in powder form.
Hazard Classifications:
(powder)
Health Hazard (Blue)
. . . . . . . . . . . . . . 1
Flammability (Red)
. . . . . . . . . . . . . . . 2
Reactivity (Yellow)
. . . . . . . . . . . . . . . . 0
FIRST AID:
Move
victim to fresh air. Call emergency medical care. Apply artificial respiration
if victim is not breathing. Administer oxygen if breathing is difficult. Remove
and isolate contaminated clothing and shoes. In case of contact with substance,
immediately flush skin or eyes with running water for at least 20 minutes. Keep
victim warm and quiet. Ensure that medical personnel are aware of the
material(s) involved, and take precautions to protect themselves.
ENVIRONMENTAL REGULATIONS
•
California LOL: M