GUIDE
125
Gases - Toxic and/or Corrosive
POTENTIAL HAZARDS
HEALTH
  • TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
  • Vapors are extremely irritating and corrosive.
  • Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
  • Fire will produce irritating, corrosive and/or toxic gases.
  • Runoff from fire control may cause environmental contamination.
FIRE OR EXPLOSION
  • Some may burn but none ignite readily.
  • Vapors from liquefied gas are initially heavier than air and spread along ground.
  • Some of these materials may react violently with water.
  • Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief devices.
  • Containers may explode when heated.
  • Ruptured cylinders may rocket.
  • For UN1005: Anhydrous ammonia, at high concentrations in confined spaces, presents a flammability risk if a source of ignition is introduced.
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.
  • Many gases are heavier than air and will spread along ground and collect in low or confined areas (sewers, basements, tanks, etc.).
  • 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 immediately for at least 100 meters (330 feet) in all directions.
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 1600 meters (1 mile) in all directions; also, consider initial evacuation for 1600 meters (1 mile) in all directions.

In Canada, an Emergency Response Assistance Plan (ERAP) may be required for this product. Please consult the shipping document and/or the ERAP Program Section.
EMERGENCY RESPONSE
FIRE
Small Fire
  • Dry chemical or CO2.
Large Fire
  • Water spray, fog or regular foam.
  • If it can be done safely, move undamaged containers away from the area around the fire.
  • Do not get water inside containers.
  • Damaged cylinders should be handled only by specialists.
Fire involving Tanks
  • Fight fire from maximum distance or use unmanned hose holders or monitor nozzles.
  • Cool containers with flooding quantities of water until well after fire is out.
  • Do not direct water at source of leak or safety devices; icing may occur.
  • 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
  • Do not touch or walk through spilled material.
  • Stop leak if you can do it without risk.
  • If possible, turn leaking containers so that gas escapes rather than liquid.
  • Prevent entry into waterways, sewers, basements or confined areas.
  • Do not direct water at spill or source of leak.
  • Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
  • Isolate area until gas has dispersed.
FIRST AID
Refer to the "General First Aid" Section
Specific First Aid:
  • In case of contact with liquefied gas, only medical personnel should attempt thawing frosted parts.
  • In case of skin contact with hydrogen fluoride, anhydrous (UN1052), if calcium gluconate gel is available, rinse 5 minutes, then apply gel. Otherwise, continue rinsing until medical treatment is available.

ERG 2024