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Chlorine dioxide																				Related Pages
Synonyms & Trade Names
			Chlorine oxide, Chlorine peroxide
CAS No.
			10049-04-4
	RTECS No.
			FO3000000
	DOT ID & Guide
			9191 143(hydrate, frozen)

FormulaClO2
	Conversion
			1 ppm = 2.76 mg/m3
	IDLH
			5 ppmSee: 10049044

Exposure Limits
			NIOSH RELTWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)
					OSHA PEL TWA 0.1 ppm (0.3 mg/m3) See Appendix G
	Measurement Methods
			**OSHA** ID126SGX , ID202
					
					See: NMAM or OSHA Methods
										
Physical Description
			Yellow to red gas or a red-brown liquid (below 52°F) with an unpleasant odor similar to chlorine and nitric acid.													
										
Molecular Weight67.5	
	Boiling Point52°F
	Freezing Point-74°F
	Solubility(77°F): 0.3%
	Vapor Pressure>1 atm
	Ionization Potential10.36 eV											
Specific Gravity1.6 (Liquid at 32°F)	
	Flash PointNA (Gas) ? (Liquid)
	Upper Explosive Limit?
	Lower Explosive Limit?
	Relative Gas Density2.33
Flammable Gas/Combustible Liquid
Incompatibilities & Reactivities
			Organic materials, heat, phosphorus, potassium hydroxide, sulfur, mercury, carbon monoxide
					[Note: Unstable in light. A powerful oxidizer.]
Exposure Routes
			inhalation, ingestion (liquid), skin and/or eye contact
Symptoms
			irritation eyes, nose, throat; cough, wheezing, bronchitis, pulmonary edema; chronic bronchitis
Target Organs
			Eyes, respiratory system
										
Personal Protection/Sanitation
			(See protection codes) **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)
	First Aid
			(See procedures)**Eye:**Irrigate immediately (liquid)
							**Skin:**Soap wash immediately (liquid)
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately (liquid)
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
See also
			INTRODUCTION
					  ICSC CARD: 0127
					  MEDICAL TESTS: 0045

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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