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| Calcium oxide | CAS 1305-78-8 | ||
| CaO | RTECS EW3100000 | ||
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Synonyms & Trade Names Burned lime, Burnt lime, Lime, Pebble lime, Quick lime, Unslaked lime |
DOT ID & Guide 1910 157 |
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Exposure Limits |
NIOSH REL: TWA 2 mg/m3 | ||
| OSHA PEL: TWA 5 mg/m3 | |||
| IDLH 25 mg/m3 | Conversion | ||
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Physical Description White or gray, odorless lumps or granular powder. |
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MW: 56.1 |
BP: 5162°F |
MLT: 4662°F |
Sol: Reacts |
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VP: 0 mmHg (approx) |
IP: NA |
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Sp.Gr: 3.34 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Solid, but will support combustion by liberation of oxygen. | |||
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Incompatibilities & Reactivities Water (liberates heat), fluorine, ethanol [Note: Reacts with water to form calcium hydroxide.] |
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Measurement Methods NIOSH 7020; OSHA ID121 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated/Daily Remove: When wet or contaminated Change: Daily Provide: Eyewash, Quick drench |
First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Respirator Recommendations
NIOSH Up to 10 mg/m3: (APF = 5) Any dust and mist respirator Up to 20 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators/(APF = 10) Any supplied-air respirator Up to 25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter/(APF = 50) Any air-purifying, full-facepiece respirator with 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 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, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, skin, upper respiratory tract; ulcer, perforation nasal septum; pneumonitis; dermatitis | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |