Chlorine dioxide
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CAS
10049-04-4
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ClO2
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RTECS
FO3000000
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Synonyms & Trade Names
Chlorine oxide, Chlorine peroxide
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DOT ID & Guide
9191 / 143 (hydrate, frozen)
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Exposure
Limits
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NIOSH REL: TWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)
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OSHA PEL†: TWA 0.1 ppm (0.3 mg/m3)
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IDLH
5 ppm
See: 10049044
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Conversion
1 ppm = 2.76 mg/m3
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Physical Description
Yellow to red gas or a red-brown liquid (below 52°F) with an unpleasant odor similar to chlorine and nitric acid.
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MW: 67.5
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BP: 52°F
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FRZ: -74°F
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Sol(77°F): 0.3%
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VP: >1 atm
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IP: 10.36 eV
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RGasD: 2.33
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Sp.Gr: 1.6 (Liquid at 32°F)
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Fl.P: NA (Gas) ? (Liquid)
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UEL: ?
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LEL: ?
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Flammable Gas/Combustible Liquid
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Incompatibilities & Reactivities
Organic materials, heat, phosphorus, potassium hydroxide, sulfur, mercury, carbon monoxide [Note: Unstable in light. A powerful oxidizer.]
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Measurement Methods
OSHA ID126SGX, ID202
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact (liquid)
Eyes: Prevent eye contact (liquid)
Wash skin: When contaminated (liquid)
Remove: When wet (flammable)
Change: No recommendation
Provide: Eyewash (liquid), Quick drench (liquid)
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First Aid (See procedures)
Eye: Irrigate immediately (liquid)
Skin: Soap wash immediately (liquid)
Breathing: Respiratory support
Swallow: Medical attention immediately (liquid)
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Respirator Recommendations
NIOSH/OSHA
Up to 1 ppm:
(APF = 10) Any chemical cartridge respirator with cartridge(s) providing protection against the compound of concern
(APF = 10) Any supplied-air respirator
Up to 2.5 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern£
Up to 5 ppm:
(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern
(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
(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 (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion (liquid), skin and/or eye contact
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Symptoms
Irritation eyes, nose, throat; cough, wheezing, bronchitis, pulmonary edema; chronic bronchitis
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Target Organs
Eyes, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 0127 See MEDICAL TESTS: 0045
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