☣️ UN 3310 • CLASS 2
Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A)
Placard: Toxic Gas. 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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Quick details
UN 3310
Class: 2
Placard type: Toxic Gas
ERG: Guide 124 (check current ERG)
Isolation: ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area
Chemical & Response Details
| Also known as | Liquefied poisonous oxidizing corrosive gas n.o.s.Toxic oxidizing corrosive gas liquefiedPoisonous liquefied gas oxidizing corrosive |
| Appearance | N.O.S. (not otherwise specified) classification encompasses various liquefied gases that are toxic, oxidizing, and corrosive. Specific physical properties vary by constituent chemical; typically exists as compressed liquefied gas at room temperature. |
| Flash Point | Not applicable (compressed gas) |
| Boiling Point | Varies by specific chemical constituent |
| Vapor Density | Heavier than air (typical for liquefied gases) |
| Water Reactivity | May react violently with water producing corrosive and toxic fumes; avoid water contact |
| Extinguishing | Do not use water or foam; use appropriate extinguishing media for surrounding fire only |
| PPE | ⚠️ Level A required; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A |
| Isolation | ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin.
- Fire will produce irritating, corrosive and/or toxic gases.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Runoff from fire control or dilution water may cause environmental contamination.
- Substance does not burn but will support combustion.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- These are strong oxidizers and will react vigorously or explosively with many materials including fuels.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
First actions (field-minded)
- 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.
- See Table 1 - Initial Isolation and Protective Action Distances.
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UN 3310 — Liquefied gas, poisonous, oxidizing, cor HAZMAT RADIO NOTE — UN 3310
Product: Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A)
Class 2 / Toxic Gas / ERG 124
PPE: Level A required; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A
ISOLATION: ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area
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 3310 — Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A)
Class: 2 | Placard: Toxic Gas | ERG Guide: 124
Appearance: N.O.S. (not otherwise specified) classification encompasses various liquefied gases that are toxic, oxidizing, and corrosive. Specific physical properties vary by constituent chemical; typically exists as compressed liquefied gas at room temperature.
Water Reactivity: May react violently with water producing corrosive and toxic fumes; avoid water contact
Extinguishing: Do not use water or foam; use appropriate extinguishing media for surrounding fire only
PPE: Level A required; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A
Isolation: ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin.
• Fire will produce irritating, corrosive and/or toxic gases.
• 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/3310 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3310 Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A) Cls2 ERG124 | allfirefighter.com/hazmat/un/3310SMS / 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/3310
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FAQ
TOXIC and/or CORROSIVE; may be fatal if inhaled or absorbed through skin. Fire will produce irritating, corrosive and/or toxic gases. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Runoff from fire control or dilution water may cause environmental contamination. Substance does not burn but will support combustion. Vapors from liquefied gas are initially heavier than air and spread along ground. These are strong oxidizers and will react vigorously or explosively with many materials including fuels. May ignite combustibles (wood, paper, oil, clothing, etc.).
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; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 124 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.