Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content
NIOSH

CHLORINE DIOXIDE

ICSC: 0127

Chlorine oxide
Chlorine peroxide
Chlorine(IV)oxide
ClO2
Molecular mass: 67.5
ICSC # 0127 		CAS # 10049-04-4
RTECS # FO3000000
EC # 006-089-00-2
October 20, 1999 Validated

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

STORAGE

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.
Fireproof if in building. Separated from combustible and reducing substances. Cool. Keep in the dark. Ventilation along the floor.

O symbol
T+ symbol
N symbol
R: 6-8-26-34-50
S: 1/2-23-26-28-36/37/39-38-45-61
ICSC: 0127 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

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 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/m3;
Peak limitation category: I(1); Pregnancy risk group: D;
(DFG 2006).
OSHA PEL†: TWA 0.1 ppm (0.3 mg/m3)
NIOSH REL: TWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)
NIOSH IDLH: 5 ppm See: 10049044


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: 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.

N O T E S

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



ICSC: 0127 CHLORINE DIOXIDE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, 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. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
Top