ERG 2024 · Guide 131

Flammable Liquids - Toxic

UN1228 · Mercaptan mixture, liquid, flammable, poisonous, n.o.s.

Also listed as: Mercaptan mixture, liquid, flammable, toxic, n.o.s. · Mercaptans, liquid, flammable, poisonous, n.o.s. · Mercaptans, liquid, flammable, toxic, n.o.s.

Class 3

Flammable Liquid placard (DOT 49 CFR §172)

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 →

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.
Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
Fire will produce irritating, corrosive and/or toxic gases.
Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
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

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.
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 - 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 tank car or highway tank 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.

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, Rail Tank Cars or Highway 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.
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.
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

Refer to the “General First Aid” section.

Specific First Aid:

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.

ERG 2024 · Guide 131

Flammable Liquids - Toxic

UN1228 · Mercaptan mixture, liquid, flammable, poisonous, n.o.s.

Also listed as: Mercaptan mixture, liquid, flammable, toxic, n.o.s. · Mercaptans, liquid, flammable, poisonous, n.o.s. · Mercaptans, liquid, flammable, toxic, n.o.s.

Class 3

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 →

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.
Methyl chloroacetate (UN2295) is an eye irritant/lachrymator (causes flow of tears).
Fire will produce irritating, corrosive and/or toxic gases.
Vapors may cause dizziness or asphyxiation, especially when in closed or confined areas.
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

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.
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 - 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 tank car or highway tank 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.

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, Rail Tank Cars or Highway 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.
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.
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

Refer to the “General First Aid” section.

Specific First Aid:

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.