TIH · Toxic inhalation hazard · Isolate immediately upwind before approach

ERG 2024 · Guide 173

Adsorbed Gases - Toxic*

UN3516 · Adsorbed gas, poisonous, corrosive, n.o.s.

Also listed as: Adsorbed gas, poisonous, corrosive, n.o.s. (Inhalation Hazard Zone A) · Adsorbed gas, poisonous, corrosive, n.o.s. (Inhalation Hazard Zone B) · Adsorbed gas, poisonous, corrosive, n.o.s. (Inhalation Hazard Zone C) · Adsorbed gas, poisonous, corrosive, n.o.s. (Inhalation Hazard Zone D) · Adsorbed gas, toxic, corrosive, n.o.s. · Adsorbed gas, toxic, corrosive, n.o.s. (Inhalation Hazard Zone A) · Adsorbed gas, toxic, corrosive, n.o.s. (Inhalation Hazard Zone B) · Adsorbed gas, toxic, corrosive, n.o.s. (Inhalation Hazard Zone C) · Adsorbed gas, toxic, corrosive, n.o.s. (Inhalation Hazard Zone D)

Class 9TIH

CHEMTREC · 24/7

1-800-424-9300

Right now: Move upwind. Isolate 100 m minimum. Deny entry. Call CHEMTREC with shipping paper in hand.

More contacts →

Green Table 1 — Initial isolation & protective action distances

Full table →

Small spill · Isolate

30 m

Day

0.1 km

Night

0.1 km

Large spill · Isolate

30 m

Day

0.1 km

Night

0.1 km

Potential Hazards

Health

TOXIC; may be fatal if inhaled or absorbed through skin.
Vapors may be irritating.
Contact with gas may cause burns and injury.
Fire will produce irritating, corrosive and/or toxic gases.
Runoff from fire control or dilution water may cause environmental contamination.

Fire or explosion

Some gases may burn or be ignited by heat, sparks or flames.
May form explosive mixtures with air.
Oxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low transportation pressures.
Vapors may travel to source of ignition and flash back.
Some of these materials may react violently with water.
Cylinders exposed to fire may vent and release toxic and flammable gas through pressure relief devices.
Runoff may create fire hazard.

Public Safety

General

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 - Initial Isolation and Protective Action Distances.
Fire
If several small packages (inside a railcar or trailer) are 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.
* Some substances may also be flammable, corrosive and/or oxidizing

Emergency Response

Fire

DO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED.

Small Fire

Dry chemical, CO2, water spray or alcohol-resistant foam.
For UN3515, UN3518, UN3520, use water only; no dry chemical, CO2 or Halon®.

Large Fire

Water spray, fog or alcohol-resistant foam.
Do not get water inside containers.
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 Several Small Packages (inside a railcar or trailer)

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.
Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
ALWAYS stay away from tanks in direct contact with flames.

Spill or leak

Some gases may be flammable. ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
For flammable gases, all equipment used when handling the product must be grounded.
For oxidizing substances, keep combustibles (wood, paper, oil, etc.) away from spilled material.
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.
Prevent entry into waterways, sewers, basements or confined areas.
Isolate area until gas has dispersed.

First Aid

Refer to the “General First Aid” section.

Specific First Aid:

In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin.

Adsorbed Gases - Toxic*

UN3516 · Adsorbed gas, poisonous, corrosive, n.o.s.