OSHA/EPA Occupational Chemical Database
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Chemical Identification
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| Chemical Name: CHLORINE DIOXIDE |
| CAS #: 10049-04-4 |
UN No: |
Formula: ClO2 |
| Synonyms: Chlorine oxide; Chlorine peroxide |
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Physical Properties
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| Physical Description: Yellow to red gas or a red-brown liquid (below 52ºF) with an unpleasant odor similar to chlorine and nitric acid. |
| BP: 52ºF |
MW: 67.5 |
LEL: NA |
NFPA Fire Rating: NA |
| FRZ/MLT: FRZ: -74ºF |
VP: >1 atm |
UEL: NA |
NFPA Health Rating: NA |
| FP: NA (Gas) ? (Liquid) |
VD: 2.33 |
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NFPA Reactivity Rating: NA |
| Sp. GR: 1.6 (Liquid at 32ºF) |
IP: 10.36 eV |
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NFPA Sp. Inst.: NA |
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Exposure Limits
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| OSHA |
NIOSH |
Related Information |
| PEL-TWA ppm: 0.1 |
REL-TWA ppm: 0.1 |
AIHA Emergency Response Planning Guidelines - ERPG-1/ERPG-2/ERPG-3: NA/0.5 ppm/3 ppm |
| PEL-TWA mg/m3: 0.3 |
REL-TWA mg/m3: 0.3 |
| PEL-STEL ppm: NA |
REL-STEL ppm: 0.3 |
| PEL-STEL mg/m3: NA |
REL-STEL mg/m3: 0.9 |
| PEL-C ppm: NA |
REL-C ppm: NA |
| PEL-C mg/m3: NA |
REL-C mg/m3: NA |
Carcinogen Classifications: NA |
| Skin Notation: No |
Skin Notation: No |
| Notes: NA |
Notes: NA |
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IDLH ppm: NA |
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IDLH mg/m3: 5 |
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IDLH Notes: NA |
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NIOSH Pocket Guide to Chemical Hazards (Current through June 2006)
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| Chlorine dioxide |
CAS: 10049-04-4 |
| Formula: ClO2 |
RTECS: FO3000000 |
| Synonyms & Trade Names: Chlorine oxide, Chlorine peroxide |
DOT ID & Guide: 9191 143 (hydrate, frozen) |
| Exposure Limits |
| NIOSH REL: TWA 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) |
| IDLH: 5 ppm |
Conversion: 1 ppm = 2.76 mg/m3 |
| Physical Description |
| Yellow to red gas or a red-brown liquid (below 52F) with an unpleasant odor similar to chlorine and nitric acid. |
| MW: 67.5 |
BP: 52F |
FRZ: -74F |
Sol(77F): 0.3% |
| VP: >1 atm |
IP: 10.36 eV |
RGasD: 2.33 |
Sp.Gr: 1.6 (Liquid at 32F) |
| Fl.P: NA (Gas) ? (Liquid) |
UEL: ? |
LEL: ? |
MEC: NA |
| Flammable Gas/Combustible Liquid (See flammable and combustible liquid classes) |
| Incompatibilities & Reactivities |
| Organic materials, heat, phosphorus, potassium hydroxide, sulfur, mercury, carbon monoxide [Note: Unstable in light. A powerful oxidizer.] |
| Measurement Methods |
| OSHA ID126SGX, ID202 |
| Personal Protection & Sanitation |
First Aid |
Skin: Prevent skin contact (liquid) Eyes: Prevent eye contact (liquid) Wash skin: When contam (liquid) Remove: When wet (flamm) Change: N.R. Provide: Eyewash (liquid), Quick drench (liquid) |
Eye: Irr immed (liquid) Skin: Soap wash immed (liquid) Breath: Resp support Swallow: Medical attention immed (liquid) (See procedures) |
| NIOSH Respirator Recommendations |
NIOSH/OSHA 1 ppm: CCRS/SA 2.5 ppm: SA:CF/PAPRS 5 ppm: CCRFS/GMFS/SCBAF/SAF : SCBAF:PD,PP/SAF:PD,PP:ASCBA Escape GMFS/SCBAE (See symbols and codes) |
| Exposure Routes |
| Inh Ing (liquid) Con |
| Symptoms |
Irrit eyes, nose, throat; cough, wheez, bron, pulm edema; chronic bron (See abbreviations) |
| Target Organs |
Eyes, resp sys (See abbreviations) |
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DOT Emergency Response Guidebook (ERG 2004)
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Guide Number: 143143 Oxidizers (Unstable)
POTENTIAL HAZARDS
FIRE OR EXPLOSION
* May explode from friction, heat or contamination.
* These substances will accelerate burning when involved in a fire.
* May ignite combustibles (wood, paper, oil, clothing, etc.).
* Some will react explosively with hydrocarbons (fuels).
* Containers may explode when heated.
* Runoff may create fire or explosion hazard.
HEALTH
* TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors,
dusts or substance may cause severe injury, burns, or death.
* Fire may produce irritating and/or toxic gases.
* Toxic fumes or dust may accumulate in confined areas (basement,
tanks, hopper/tank cars, etc.).
* Runoff from fire control or dilution water may cause pollution.
PUBLIC SAFETY
* CALL Emergency Response Telephone Number on Shipping Paper first. If
Shipping Paper not available or no answer, refer to appropriate
telephone number listed on the inside back cover.
* Isolate spill or leak area immediately for at least 50 to 100 meters
(160 to 330 feet) in all directions.
* Keep unauthorized personnel away.
* Stay upwind.
* Keep out of low areas.
* Ventilate closed spaces before entering.
PROTECTIVE CLOTHING
* Wear positive pressure self-contained breathing apparatus (SCBA).
* Wear chemical protective clothing which is specifically recommended by
the manufacturer. It may provide little or no thermal protection.
* Structural firefighters' protective clothing provides limited
protection in fire situations ONLY; it is not effective in spill
situations.
EVACUATION
Spill
* See the Table of Initial Isolation and Protective Action Distances for
highlighted substances. For non-highlighted substances, increase, in
the downwind direction, as necessary, the isolation distance shown
under PUBLIC SAFETY.
Fire
* If tank, rail car or tank truck is involved in a fire, ISOLATE for
800 meters (1/2 mile) in all directions; also, consider initial
evacuation for 800 meters (1/2 mile) in all directions.
EMERGENCY RESPONSE
FIRE
Small Fires
* Use water. Do not use dry chemicals or foams. CO2 or Halon may
provide limited control.
Large Fires
* Flood fire area with water from a distance.
* Do not move cargo or vehicle if cargo has been exposed to heat.
* Move containers from fire area if you can do it without risk.
* Do not get water inside containers: a violent reaction may occur.
* Cool containers with flooding quantities of water until well after
fire is out.
* Dike fire-control water for later disposal.
* ALWAYS stay away from tanks engulfed in fire.
* For massive fire, use unmanned hose holders or monitor nozzles; if this
is impossible, withdraw from area and let fire burn.
SPILL OR LEAK
* Keep combustibles (wood, paper, oil, etc.) away from spilled material.
* Do not touch damaged containers or spilled material unless wearing
appropriate protective clothing.
* Use water spray to reduce vapors or divert vapor cloud drift.
* Prevent entry into waterways, sewers, basements or confined areas.
Small Spills
* Flush area with flooding quantities of water.
Large Spills
* DO NOT CLEAN-UP OR DISPOSE OF, EXCEPT UNDER SUPERVISION OF A
SPECIALIST.
FIRST AID
* Move victim to fresh air.
* Call 911 or emergency medical service.
* Apply artificial respiration if victim is not breathing.
* Administer oxygen if breathing is difficult.
* Remove and isolate contaminated clothing and shoes.
* In case of contact with substance, immediately flush skin or eyes with
running water for at least 20 minutes.
* Keep victim warm and quiet.
* Ensure that medical personnel are aware of the material(s) involved,
and take precautions to protect themselves. |
| ERG 2004 Isolation and Protective Distances |
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SMALL SPILLS | LARGE SPILLS
(From a small package or | (From a large package or
small leak from a large pkg.) | from many small packages)
First | Then | First | Then
ISOLATE | PROTECT | ISOLATE | PROTECT
in all |persons Downwind | in all | persons Downwind
Directions | during- |Directions | during-
|DAY NIGHT | | DAY NIGHT |
Chlorine dioxide, hydrate, frozen (when spilled in water) |
100 ft 0.1 mi 0.1 mi 100 ft 0.1 mi 0.4 mi |
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| ERG 2004 Toxic-by-Inhalation (TIH) Gas(es) Produced When Spilled in Water |
| TIH: Cl2 |
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Additional Emergency Response Information (CAMEO Data)
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| Non-fire Spill Response: NA |
| Firefighting: NA |
| Reactivity: Organic materials, heat, phosphorus, potassium hydroxide, sulfur, mercury, carbon monoxide |
| First Aid: Eyes: Irrigate immediately (liquid); Skins: Soap wash immediately (liquid); Inhalation: Respiratory support; Ingestion: Medical attention immediately (liquid) |
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