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| Osmium tetroxide | CAS 20816-12-0 | ||
| OsO4 | RTECS RN1140000 | ||
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Synonyms & Trade Names Osmic acid anhydride, Osmium oxide |
DOT ID & Guide 2471 154 |
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Exposure Limits |
NIOSH REL: TWA 0.002 mg/m3 (0.0002 ppm) ST 0.006 mg/m3 (0.0006 ppm) | ||
| OSHA PEL†: TWA 0.002 mg/m3 | |||
| IDLH 1 mg/m3 See: 20816120 | Conversion 1 ppm = 10.40 mg/m3 | ||
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Physical Description Colorless, crystalline solid or pale-yellow mass with an unpleasant, acrid, chlorine-like odor. [Note: A liquid above 105°F.] |
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MW: 254.2 |
BP: 266°F |
MLT: 105°F |
Sol(77°F): 6% |
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VP: 7 mmHg |
IP: 12.60 eV |
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Sp.Gr: 5.10 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Solid | |||
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Incompatibilities & Reactivities Hydrochloric acid, easily oxidized organic materials [Note: Begins to sublime below BP. Contact with other materials may cause fire.] |
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Measurement Methods None available See: NMAM or OSHA Methods |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily Provide: Eyewash |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Important additional information about respirator selection Respirator Recommendations NIOSH/OSHA Up to 0.1 mg/m3: (APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern and having a high-efficiency particulate filter/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern and having a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 1 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is 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 (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern and having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, respiratory system; lacrimation (discharge of tears), visual disturbance; conjunctivitis; headache; cough, dyspnea (breathing difficulty); dermatitis | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION See ICSC CARD: 0528 |