Hydrogen cyanide

CAS RN: 74-90-8

DOT Emergency Guidelines

If THERE IS NO FIRE, go directly to protective distances to obtain initial isolation and protective action distances. IF THERE IS A FIRE, or IF A FIRE IS INVOLVED, go directly to the EVACUATION information shown below under PUBLIC SAFETY.

Go to Guide 117
Go to Guide 131
Go to Guide 152
Go to Guide 154

GUIDE 117
Gases - Toxic - Flammable (Extreme Hazard)
POTENTIAL HAZARDS
HEALTH
· TOXIC; Extremely Hazardous.
· May be fatal if inhaled or absorbed through skin.
· Initial odor may be irritating or foul and may deaden your sense of smell.
· 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 or dilution water may cause environmental contamination.
FIRE OR EXPLOSION
· These materials are extremely flammable.
· May form explosive mixtures with air.
· May be ignited by heat, sparks or flames.
· Vapors from liquefied gas are initially heavier than air and spread along ground.
· Vapors may travel to source of ignition and flash back.
· Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
· Runoff may create fire or explosion hazard.
· Cylinders exposed to fire may vent and release toxic and flammable gas through pressure relief devices.
· Containers may explode when heated.
· Ruptured cylinders may rocket.
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 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.
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 for at least 100 meters (330 feet) in all directions.
Spill
· See Table 1 - .
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 paper and/or the ERAP Program Section.
EMERGENCY RESPONSE
FIRE
· DO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED.
Small Fire
· Dry chemical, CO2, water spray or regular foam.
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.
SPILL OR LEAK
· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
· All equipment used when handling the product must be grounded.
· Do not touch or walk through spilled material.
· Stop leak if you can do it without risk.
· Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
· Do not direct water at spill or source of leak.
· If possible, turn leaking containers so that gas escapes rather than liquid.
· Prevent entry into waterways, sewers, basements or confined areas.
· Isolate area until gas has dispersed.
· Consider igniting spill or leak to eliminate toxic gas concerns.
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.
· In case of contact with liquefied gas, thaw frosted parts with lukewarm water.
· In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin.
· Keep victim calm and warm.
· Keep victim under observation.
· Effects of contact or inhalation may be delayed.
ERG 2020

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GUIDE 131
Flammable Liquids - Toxic
POTENTIAL HAZARDS
HEALTH
· TOXIC; may be fatal if inhaled, ingested or absorbed through skin.
· Inhalation or contact with some of these materials will irritate or burn skin and eyes.
· Fire will produce irritating, corrosive and/or toxic gases.
· Vapors may cause dizziness or asphyxiation.
· Runoff from fire control or dilution water may cause environmental contamination.
FIRE OR EXPLOSION
· HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
CAUTION: Methanol (UN1230) will burn with an invisible flame. Use an alternate method of detection (thermal camera, broom handle, etc.)
· Vapors may form explosive mixtures with air.
· Vapors may travel to source of ignition and flash back.
· Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas (sewers, basements, tanks, etc.).
· Vapor explosion and poison hazard indoors, outdoors or in sewers.
· Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
· Runoff to sewer may create fire or explosion hazard.
· Containers may explode when heated.
· Many liquids will float on water.
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 for at least 50 meters (150 feet) in all directions.
Spill
· For highlighted materials: see Table 1 - .
· 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
CAUTION: The majority of these products have a very low flash point. Use of water spray when fighting fire may be inefficient.
CAUTION: Methanol (UN1230) will burn with an invisible flame. Use an alternate method of detection (thermal camera, broom handle, etc.)
Small Fire
· Dry chemical, CO2, water spray or alcohol-resistant foam.
Large Fire
· Water spray, fog or alcohol-resistant foam.
· If it can be done safely, move undamaged containers away from the area around the fire.
· Dike runoff from fire control for later disposal.
· Avoid aiming straight or solid streams directly onto the product.
Fire Involving Tanks or Car/Trailer Loads
· 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.
· Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
· ALWAYS stay away from tanks engulfed in fire.
· For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
SPILL OR LEAK
· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
· All equipment used when handling the product must be grounded.
· Do not touch or walk through spilled material.
· Stop leak if you can do it without risk.
· Prevent entry into waterways, sewers, basements or confined areas.
· A vapor-suppressing foam may be used to reduce vapors.
Small Spill
· Absorb with earth, sand or other non-combustible material and transfer to containers for later disposal.
· Use clean, non-sparking tools to collect absorbed material.
Large Spill
· Dike far ahead of liquid spill for later disposal.
· Water spray may reduce vapor, but may not prevent ignition in closed spaces.
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.
· Wash skin with soap and water.
· In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin.
· Keep victim calm and warm.
· Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed.
ERG 2020

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GUIDE 152
Substances - Toxic (Combustible)
POTENTIAL HAZARDS
HEALTH
· Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
· 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
· Combustible material: may burn but does not ignite readily.
· Containers may explode when heated.
· Runoff may pollute waterways.
· Substance may be transported in a molten form.
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.
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 - .
· 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
· Water spray, fog or regular foam.
· If it can be done safely, move undamaged containers away from the area around the fire.
· Dike runoff from fire control for later disposal.
· Avoid aiming straight or solid streams directly onto the product.
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.
· For massive fire, use unmanned master stream devices or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
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.
· Cover with plastic sheet to prevent spreading.
· 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

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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 - .
· 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

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Find more information on this substance at: PubChem, PubMed