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Silicon |
CAS 7440-21-3 | ||
Si |
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.] |
DOT ID & Guide 1346 170 (amorphous powder) |
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Exposure
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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 | ||
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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 |
BP: 4271°F |
MLT: 2570°F |
Sol: Insoluble |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr(77°F): 2.33 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
MEC: 160 g/m3 |
| 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 |
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Personal Protection & Sanitation (See protection) 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 |
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Important additional information about respirator selection Respirator Recommendations Not available. |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, skin, upper respiratory system; cough | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |