Silica, crystalline (as respirable dust)
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CAS
14808-60-7
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SiO2
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RTECS
VV7330000
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Synonyms & Trade Names
Cristobalite, Quartz, Tridymite, Tripoli
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: Ca TWA 0.05 mg/m3 See Appendix A
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OSHA PEL:See Appendix C (Mineral Dusts)
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IDLH
Ca [25 mg/m3 (cristobalite, tridymite); 50 mg/m3 (quartz, tripoli)
See: 14808607
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Conversion
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Physical Description
Colorless, odorless solid. [Note: A component of many mineral dusts.]
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MW: 60.1
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BP: 4046°F
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MLT: 3110°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: 2.66
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Fl.P: NA
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UEL: NA
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LEL: NA
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Noncombustible Solid
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Incompatibilities & Reactivities
Powerful oxidizers: fluorine, chlorine trifluoride, manganese trioxide, oxygen difluoride, hydrogen peroxide, etc.; acetylene; ammonia
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Measurement Methods
NIOSH 7500, 7601, 7602; OSHA ID142
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Breathing: Fresh air
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Respirator Recommendations
NIOSH
Up to 0.5 mg/m3:
(APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.
Up to 1.25 mg/m3:
(APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
Up to 2.5 mg/m3:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.
(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter
Up to 25 mg/m3:
(APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air 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 positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, skin and/or eye contact
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Symptoms
Cough, dyspnea (breathing difficulty), wheezing; decreased pulmonary function, progressive respiratory symptoms (silicosis); irritation eyes; [potential occupational carcinogen]
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Target Organs
Eyes, respiratory system
Cancer Site
[in animals: lung cancer]
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See also: INTRODUCTION
See ICSC CARD: 0808 |
