CAS RN: 75-72-9

DOT Emergency Guidelines

Gases - Compressed or Liquefied (Including Refrigerant Gases)
· Some may burn but none ignite readily.
· Containers may explode when heated.
· Ruptured cylinders may rocket.
CAUTION: Aerosols (UN1950) may contain a flammable propellant.
· Vapors may cause dizziness or asphyxiation without warning.
· Vapors from liquefied gas are initially heavier than air and spread along ground.
· Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
· Fire may produce irritating, corrosive and/or toxic gases.
· 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 the ground and collect in low or confined areas (sewers, basements, tanks, etc.).
· Ventilate closed spaces before entering, but only if properly trained and equipped.
· 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.
Immediate precautionary measure
· Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
Large Spill
· Consider initial downwind evacuation for at least 500 meters (1/3 mile).
· 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.
· Use extinguishing agent suitable for type of surrounding 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.
· Damaged cylinders should be handled only by specialists.
Fire Involving Tanks
· Fight fire from maximum distance or use unmanned master stream devices 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.
· Some of these materials, if spilled, may evaporate leaving a flammable residue.
· Do not touch or walk through spilled material.
· Stop leak if you can do it without risk.
· 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.
· If possible, turn leaking containers so that gas escapes rather than liquid.
· Prevent entry into waterways, sewers, basements or confined areas.
· Allow substance to evaporate.
· Ventilate the area.
· 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.
· Administer oxygen if breathing is difficult.
· Remove and isolate contaminated clothing and shoes.
· In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
· Keep victim calm and warm.
ERG 2020

Find more information on this substance at: PubChem, PubMed