☣️ UN 3162 • CLASS 2
UN 3162 — Liquefied gas, poisonous, n.o.s. (Inhalation Hazard Zone A)
Placard: Toxic Gas. ERG Guide 123. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 3162 Quick Details
UN 3162
Product name: Liquefied gas, poisonous, n.o.s. (Inhalation Hazard Zone A)
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 123 (check current ERG)
Initial isolation: ERG 123: Initial isolate 800m all directions; protective action distance up to 11+ km downwind for large spills
Common Hazards of UN 3162
- TOXIC; may be fatal if inhaled or absorbed through skin.
- Vapors may be irritating and/or 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 or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief
Chemical Identity & Physical Properties
| Also known as | Toxic compressed gas N.O.S.Poisonous liquefied gas N.O.S.Toxic gas Zone ALiquefied toxic gas |
| Appearance | Variable appearance depending on specific chemical. Typically a colorless to light-colored liquefied gas under pressure. May have distinct odor or be odorless depending on composition. |
| Flash Point | Not applicable (compressed gas) |
| Boiling Point | Variable depending on specific chemical composition |
| Vapor Density | Variable, typically heavier than air (>1.0) |
| Water Reactivity | Variable depending on specific chemical; may react or dissolve |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3162
Extinguishing Media
Do not use water or foam; use appropriate dry chemical or inert gas as specified for the specific chemical
PPE Requirements
⚠️ Level A required for Zone A materials; full encapsulating suit with SCBA; extreme inhalation and skin contact hazard
Isolation & Evacuation
ERG 123: Initial isolate 800m all directions; protective action distance up to 11+ km downwind for large spills
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 123).
First Actions for a UN 3162 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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
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UN 3162 — Liquefied gas, poisonous, n.o.s. (InhalaHAZMAT RADIO NOTE — UN 3162
Product: Liquefied gas, poisonous, n.o.s. (Inhalation Hazard Zone A)
Class 2 / Toxic Gas / ERG 123
PPE: Level A required for Zone A materials; full encapsulating suit with SCBA; extreme inhalation and skin contact hazard
ISOLATION: ERG 123: Initial isolate 800m all directions; protective action distance up to 11+ km downwind for large spills
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 3162 — Liquefied gas, poisonous, n.o.s. (Inhalation Hazard Zone A)
Class: 2 | Placard: Toxic Gas | ERG Guide: 123
Appearance: Variable appearance depending on specific chemical. Typically a colorless to light-colored liquefied gas under pressure. May have distinct odor or be odorless depending on composition.
Water Reactivity: Variable depending on specific chemical; may react or dissolve
Extinguishing: Do not use water or foam; use appropriate dry chemical or inert gas as specified for the specific chemical
PPE: Level A required for Zone A materials; full encapsulating suit with SCBA; extreme inhalation and skin contact hazard
Isolation: ERG 123: Initial isolate 800m all directions; protective action distance up to 11+ km downwind for large spills
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin.
• Vapors may be irritating and/or corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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
SOURCE: allfirefighter.com/hazmat/un/3162 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3162 Liquefied gas, poisonous, n.o.s. (Inhalation Hazard Zone A) Cls2 ERG123 | allfirefighter.com/hazmat/un/3162SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/3162
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Frequently Asked Questions about UN 3162
TOXIC; may be fatal if inhaled or absorbed through skin. Vapors may be irritating and/or 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 or dilution water may cause environmental contamination. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level A required for Zone A materials; full encapsulating suit with SCBA; extreme inhalation and skin contact hazard
Water reactivity: Variable depending on specific chemical; may react or dissolve. Recommended extinguishing: Do not use water or foam; use appropriate dry chemical or inert gas as specified for the specific chemical.
ERG Guide 123 recommendation: ERG 123: Initial isolate 800m all directions; protective action distance up to 11+ km downwind for large spills
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 123 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.