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CHLORINE DIOXIDE
ICSC: 0127
Peer-Review Status: 20.10.1999 Validated
Chlorine oxide
Chlorine peroxide
Chlorine(IV)oxide 
CAS #: 10049-04-4 RTECS #: FO3000000
EC #: 006-089-00-2
EINECS #: 233-162-8
    Formula: ClO2
Molecular mass: 67.5

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion.  NO contact with combustible substances.  In case of fire in the surroundings, use appropriate extinguishing media. 
EXPLOSION Risk of fire and explosion. See Chemical Dangers.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Do NOT expose to friction or shock.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Headache. Laboured breathing. Nausea. Shortness of breath. Sore throat. Symptoms may be delayed. See Notes.  Use closed system or ventilation.  Fresh air, rest. Half-upright position. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves. Protective clothing.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety goggles or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion      

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Remove gas with fine water spray.   
EC Classification
Symbol: O, T+, N; R: 6-8-26-34-50; S: (1/2)-23-26-28-36/37/39-38-45-61 
UN Classification
 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
  Fireproof if in building. Separated from combustible substances and reducing agents. Cool. Keep in the dark. Ventilation along the floor. 

IMPORTANT DATA
Physical State; Appearance
RED-YELLOW GAS WITH PUNGENT ODOUR. 

Physical dangers
The gas is heavier than air. 

Chemical dangers
May explode on heating or on exposure to sunlight or on shock or if subjected to sparks. The substance is a strong oxidant. It reacts with combustible and reducing materials. Reacts violently with organics, phosphorus, potassium hydroxide and sulfur. This generates fire and explosion hazard. Reacts with water. This produces hydrochloric acid and chloric acid. 

Occupational exposure limits
TLV: 0.1 ppm as TWA; 0.3 ppm as STEL; (ACGIH 2004).
MAK: 0.1 ppm, 0.28 mg/m³; Peak limitation category: I(1); Pregnancy risk group: D; (DFG 2006). 

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment. 

Effects of short-term exposure
The substance is severely irritating to the eyes, skin and respiratory tract. Inhalation of of this gas may cause lung oedema. See Notes. Exposure far above the OEL could cause death. The effects may be delayed. Medical observation is indicated. 

Effects of long-term or repeated exposure
The substance may have effects on the lungs. This may result in chronic bronchitis. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 11°C
Melting point: -59°C
Relative density (water = 1): 1.6 (liquid, 0°C)
Solubility in water, g/100ml at 20°C: 0.8
Vapour pressure, kPa at 20°C: 101
Relative vapour density (air = 1): 2.3
Explosive limits, vol% in air: >10 
This substance may be hazardous to the environment. Special attention should be given to aquatic organisms. 

NOTES
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation are therefore essential.
Immediate administration of an appropriate inhalation therapy by a doctor or a person authorized by him/her, should be considered.
Rinse contaminated clothes (fire hazard) with plenty of water.
Card has been partially updated in July 2007: see Occupational Exposure Limits. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       CHLORINE DIOXIDE (JECFA Evaluation)