Silicon
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CAS
7440-21-3
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Si
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RTECS
VW0400000
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Synonyms & Trade Names
Elemental silicon [Note: Does not occur free in nature, but is found in silicon dioxide (silica) & in various silicates.]
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DOT ID & Guide
1346 / 170 (amorphous powder)
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Exposure
Limits
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NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
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OSHA PEL†: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)
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IDLH
N.D.
See: IDLH INDEX
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Conversion
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Physical Description
Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.]
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MW: 28.1
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BP: 4271°F
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MLT: 2570°F
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Sol: Insoluble
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VP: 0 mmHg (approx)
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IP: NA
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Sp.Gr(77°F): 2.33
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Fl.P: NA
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UEL: NA
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LEL: NA
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MEC: 160 g/m3
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Combustible Solid in powder form.
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Incompatibilities & Reactivities
Chlorine, fluorine, oxidizers, calcium, cesium carbide, alkaline carbonates
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Measurement Methods
NIOSH 0500, 0600
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: Prevent eye contact
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Breathing: Fresh air
Swallow: Medical attention immediately
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Respirator Recommendations
Not available.
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, upper respiratory system; cough
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Target Organs
Eyes, skin, respiratory system
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