Silicon
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Synonyms & Trade Names
Elemental silicon [Note: Does not occur freely in nature, but is found in silicon dioxide (silica) and in various silicates.]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) See Appendix GPhysical Description
Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.]Molecular Weight
28.1Boiling Point
4271°FMelting Point
2570°FSolubility
InsolubleVapor Pressure
0 mmHg (approx)Ionization Potential
NASpecific Gravity
(77°F): 2.33Flash Point
NAUpper Exposive Limit
NALower Explosive Limit
NAMinimum Explosive Concentration
160 g/m3
Combustible Solid in powder form.
Incompatibilities & Reactivities
Chlorine, fluorine, oxidizers, calcium, cesium carbide, alkaline carbonatesExposure Routes
inhalation, ingestion, skin and/or eye contactSymptoms
irritation eyes, skin, upper respiratory system; coughTarget Organs
Eyes, skin, respiratory systemPersonal Protection/Sanitation
(See protection codes)Skin:No recommendation
Eyes:Prevent eye contact
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.
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division