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| Silica, crystalline (as respirable dust) | CAS 14808-60-7 | ||
| SiO2 | RTECS VV7330000 | ||
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Synonyms & Trade Names Cristobalite, Quartz, Tridymite, Tripoli |
DOT ID & Guide |
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Exposure Limits |
NIOSH REL: Ca TWA 0.05 mg/m3 See Appendix A | ||
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OSHA PEL: Crystalline Quartz (respirable): TWA 250 mppcf/(%SiO2 +5); TWA 10 mg/m3/(%SiO2 + 2) Quartz (total dust): TWA 30 mg/m3/(%SiO2 + 2) Cristobalite: Use � the value calculated from the count or mass formulae for quartz. Tridymite: Use � the value calculated from the formulae for quartz. |
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| IDLH Ca [25 mg/m3 (cristobalite, tridymite); 50 mg/m3 (quartz, tripoli) | Conversion | ||
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Physical Description Colorless, odorless solid. [Note: A component of many mineral dusts.] |
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MW: 60.1 |
BP: 4046°F |
MLT: 3110°F |
Sol: Insoluble |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 2.66 |
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Fl.P: NA |
UEL: NA |
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 |
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Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation |
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 air-purifying respirator with a high-efficiency particulate filter 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 a high-efficiency particulate filter/(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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, skin and/or eye contact | |
| 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 |