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Calcium oxide

Synonyms & Trade Names
Burned lime, Burnt lime, Lime, Pebble lime, Quick lime, Unslaked lime
CAS No.
1305-78-8
RTECS No.
EW3100000
DOT ID & Guide
1910 157
Formula
CaO
Conversion
IDLH
25 mg/m3
See: 1305788
Exposure Limits
NIOSH REL
: TWA 2 mg/m3
OSHA PEL
: TWA 5 mg/m3
Measurement Methods

NIOSH 7020 , 7303;
OSHA ID121
See: NMAM or OSHA Methods
Physical Description
White or gray, odorless lumps or granular powder.
MW:
56.1
BP:
5162°F		 MLT: 4662°F
Sol:
Reacts
VP:
0 mmHg (approx)
IP:
NA
Sp.Gr:
3.34
Fl.P:
NA
UEL:
NA
LEL:
NA
Noncombustible Solid, but will support combustion by liberation of oxygen.
Incompatibilities & Reactivities
Water (liberates heat), fluorine, ethanol [Note: Reacts with water to form calcium hydroxide.]
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, upper resp tract; ulcer, perforation nasal septum; pneumonitis; dermatitis
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
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
Respirator Recommendations

NIOSH

Up to 10 mg/m3:
(APF = 5) Any quarter-mask respirator.
Click here for information on selection of N, R, or P filters.

Up to 20 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.
(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 an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
(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 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

See also: INTRODUCTION   See ICSC CARD: 0409
 

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