Silicon |
Synonyms & Trade Names Elemental silicon [Note: Does not occur freely in nature, but is found in silicon dioxide (silica) and in various silicates.] |
CAS No. 7440-21-3 |
RTECS No. VW0400000 |
DOT ID & Guide 1346 170 (amorphous powder) |
FormulaSi |
Conversion |
IDLH N.D.
See: IDLH INDEX |
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) |
Measurement Methods
NIOSH 0500 , 0600
See: NMAM or OSHA Methods |
Physical Description Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.] |
MW: 28.1 |
BP: 4271°F |
MLT: 2570°F |
Sol: Insoluble |
VP: 0 mmHg (approx) |
IP: NA |
| Sp.Gr(77°F): 2.33 |
Fl.P: NA |
UEL: NA |
LEL: NA |
|
MEC: 160 g/m3 |
| Combustible Solid in powder form. |
Incompatibilities & Reactivities Chlorine, fluorine, oxidizers, calcium, cesium carbide, alkaline carbonates |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, upper respiratory system; cough |
Target Organs Eyes, skin, respiratory system |
|
Personal 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.
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 1508
|
