2,3,7,8-Tetrachlorodibenzo-p-dioxin

CAS RN: 1746-01-6

DOT Emergency Guidelines

GUIDE 154
Substances - Toxic and/or Corrosive (Non-Combustible)
POTENTIAL HAZARDS
HEALTH
· TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death.
· Contact with molten substance may cause severe burns to skin and eyes.
· Avoid any skin contact.
· Effects of contact or inhalation may be delayed.
· Fire may produce irritating, corrosive and/or toxic gases.
· Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental contamination.
FIRE OR EXPLOSION
· Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
· Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
· Contact with metals may evolve flammable hydrogen gas.
· Containers may explode when heated.
· For electric vehicles or equipment, GUIDE 147 (lithium ion batteries) or GUIDE 138 (sodium batteries) should also be consulted.
PUBLIC SAFETY
· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.
· Keep unauthorized personnel away.
· Stay upwind, uphill and/or upstream.
· Ventilate closed spaces before entering, but only if properly trained and equipped.
PROTECTIVE CLOTHING
· Wear positive pressure self-contained breathing apparatus (SCBA).
· Wear chemical protective clothing that is specifically recommended by the manufacturer when there is NO RISK OF FIRE.
· Structural firefighters' protective clothing provides thermal protection but only limited chemical protection.
EVACUATION
Immediate precautionary measure
· Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
Spill
· For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
· For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind direction, as necessary.
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.
In Canada, an Emergency Response Assistance Plan (ERAP) may be required for this product. Please consult the shipping paper and/or the ERAP Program Section.
EMERGENCY RESPONSE
FIRE
Small Fire
· Dry chemical, CO2 or water spray.
Large Fire
· Dry chemical, CO2, alcohol-resistant foam or water spray.
· If it can be done safely, move undamaged containers away from the area around the fire.
· Dike runoff from fire control for later disposal.
Fire Involving Tanks or Car/Trailer Loads
· Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles.
· Do not get water inside containers.
· Cool containers with flooding quantities of water until well after fire is out.
· Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
· ALWAYS stay away from tanks engulfed in fire.
SPILL OR LEAK
· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
· Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.
· Stop leak if you can do it without risk.
· Prevent entry into waterways, sewers, basements or confined areas.
· Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers.
· DO NOT GET WATER INSIDE CONTAINERS.
FIRST AID
· Call 911 or emergency medical service.
· Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves.
· Move victim to fresh air if it can be done safely.
· Give artificial respiration if victim is not breathing.
· Do not perform mouth-to-mouth resuscitation if victim ingested or inhaled the substance; wash face and mouth before giving artificial respiration. Use a pocket mask equipped with a one-way valve or other proper respiratory medical device.
· 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.
· For minor skin contact, avoid spreading material on unaffected skin.
· Keep victim calm and warm.
· Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed.
ERG 2020

Find more information on this substance at: PubChem, PubMed