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CHLORINE DIOXIDE ICSC: 0127
Date of Peer Review: October 1999

Chlorine oxide
Chlorine peroxide
Chlorine(IV)oxide
CAS # 10049-04-4 ClO2
RTECS # FO3000000 Molecular mass: 67.5
UN #
EC # 006-089-00-2
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 combustibles.
In case of fire in the surroundings: water in large amounts, water spray.
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).
Closed system and ventilation.
Fresh air, rest. Half-upright position. Refer for medical attention.
Skin Redness. Pain.
Protective gloves. Protective clothing.
First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention.
Eyes Redness. Pain.
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 take to a doctor.
Ingestion


SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Ventilation. Remove gas with fine water spray. Personal protection: complete protective clothing including self-contained breathing apparatus.
EU 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

EMERGENCY RESPONSE SAFE STORAGE

Fireproof if in building. Separated from combustible and reducing substances. Cool. Keep in the dark. Ventilation along the floor.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2004

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CHLORINE DIOXIDE ICSC: 0127
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, on exposure to sunlight or if subjected to shock or sparks. The substance is a strong oxidant and reacts violently with combustible and reducing materials. Reacts violently with organics, phosphorus, potassium hydroxide and sulfur, causing fire and explosion hazard. Reacts with water to produce 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/m; Peak limitation category: I(1); Pregnancy risk group: IIc; (DFG 2004).
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, the skin and the respiratory tract. Inhalation of gas may cause lung oedema (see Notes). Exposure far above the OEL may result in 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, resulting in chronic bronchitis.
PHYSICAL PROPERTIES
Boiling point: 11C
Melting point: -59C
Relative density (water = 1): 1.6 at 0C (liquid)
Solubility in water, g/100 ml at 20C: 0.8
Vapour pressure, kPa at 20C: 101
Relative vapour density (air = 1): 2.3
Explosive limits, vol% in air: >10
ENVIRONMENTAL DATA
This substance may be hazardous to the environment; special attention should be given to water 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 partly updated in April 2005. See section Occupational Exposure Limits.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2004