International Chemical Safety Cards CHLORINE DIOXIDE ICSC: 0127 CHLORINE DIOXIDE Chlorine oxide Chlorine peroxide Chlorine(IV)oxide ClO2 Molecular mass: 67.5 CAS # 10049-04-4 RTECS # FO3000000 ICSC # 0127 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 as a result of spark, impact, sunlight, heating or contact with combustible materials. 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 Corrosive. Cough. Headache. Laboured breathing. Nausea. Shortness of breath. Sore throat. Symptoms may be delayed (see Notes). Ventilation, local exhaust, or breathing protection. Closed system and ventilation. Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention. SKIN Corrosive. Redness. Serious skin burns. Pain. Protective gloves. Protective clothing. First rinse with plenty of water, then remove contaminated clothes and rinse again. Refer for medical attention. EYES Corrosive. Redness. Pain. Blurred vision. 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 STORAGE PACKAGING & LABELLING Evacuate danger area! Consult an expert! Ventilation. Remove gas with fine water spray (extra personal protection: complete protective clothing including self-contained breathing apparatus). Separated from combustible and reducing substances. Cool. Ventilation along the floor. SEE IMPORTANT INFORMATION ON BACK ICSC: 0127 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1993

International Chemical Safety Cards CHLORINE DIOXIDE ICSC: 0127 I M P O R T A N T D A T A PHYSICAL STATE; APPEARANCE: RED-YELLOW GAS , WITH PUNGENT ODOUR. PHYSICAL DANGERS: The gas is heavier than air. CHEMICAL DANGERS: May explosively decompose on shock, friction, or concussion. May explode on heating. The substance is a strong oxidant and reacts violently with combustible and reducing materials. Reacts violently with mercury, phosphorus, sulfur and many compounds, causing fire and explosion hazard. Reacts with water producing hydrochloric acid and chloric acid. OCCUPATIONAL EXPOSURE LIMITS (OELs): TLV (as TWA): 0.1 ppm; 0.28 mg/m3 (ACGIH 1992-1993). TLV (as STEL): 0.3 ppm; 0.83 mg/m3 (skin) (ACGIH 1992-1993). 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: Tear drawing. The substance is corrosive 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. The substance may have effects on the teeth, resulting in erosion. PHYSICAL PROPERTIES Boiling point: 11°C Melting point: -59°C Relative density (water = 1): 1.6 at 0°C (liquid) Solubility in water, g/100 ml 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

ENVIRONMENTAL DATA	This substance may be hazardous to the environment; special attention should be given to water organisms.
NOTES
Depending on the degree of exposure, periodic medical examination is indicated. 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 spray, by a doctor or a person authorized by him/her, should be considered. Rinse contaminated clothes (fire hazard) with plenty of water.

ADDITIONAL INFORMATION
ICSC: 0127 CHLORINE DIOXIDE © IPCS, CEC, 1993

IMPORTANT LEGAL NOTICE: Neither the CEC or 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. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use.