☣️ UN 3310 • CLASS 2
UN 3310 — Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A)
Placard: Toxic Gas. ERG Guide 124. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3310 covers a liquefied gas that is poisonous, oxidizing, corrosive, and assigned to Inhalation Hazard Zone A. It is a high-consequence n.o.s. entry where product identity controls final response tactics.
Hazard overview: The gas may be fatal if inhaled or absorbed through skin, can cause frostbite or corrosive burns, and may strongly support combustion. Oxidizing vapors can react vigorously with fuels and combustible materials.
Response guidance: Evacuate downwind areas as directed by ERG 124 and incident command. Keep combustibles and fuels away, avoid water contact unless the product is confirmed compatible, and use Level A protection for entry.
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UN 3310 Quick Details
UN 3310
Product name: Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A)
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 124 (check current ERG)
Initial isolation: ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area
Common Hazards of UN 3310
- 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.).
Chemical Identity & Physical Properties
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.
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3310
Extinguishing Media
Do not use water or foam; use appropriate extinguishing media for surrounding fire only
PPE Requirements
⚠️ Level A required; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A
Level A required; full encapsulating chemical protective suit with SCBA; respiratory protection mandatory due to Inhalation Hazard Zone A
Isolation & Evacuation
ERG 124: Initial isolation 800m in all directions; protective action distance 3.0+ km downwind for large spills; evacuate immediate area
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 124).
First Actions for a UN 3310 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- 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, corHAZMAT 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 —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• 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.
SOURCE: allfirefighter.com/hazmat/un/liquefied-gas-poisonous-oxidizing-un-3310 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3310 Liquefied gas, poisonous, oxidizing, corrosive, n.o.s. (Inhalation Hazard Zone A) Cls2 ERG124 | allfirefighter.com/hazmat/un/liquefied-gas-poisonous-oxidizing-un-3310SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/liquefied-gas-poisonous-oxidizing-un-3310
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Frequently Asked Questions about UN 3310
No, it is not classed as flammable, but it is an oxidizer and can intensify fires.
Zone A indicates an extreme inhalation hazard from toxic gas release.
Yes. Oxidizing gases may react vigorously or explosively with fuels and combustibles.
Level A fully encapsulating chemical protective clothing with SCBA is required for release response.
Avoid direct water or foam unless the specific gas and container situation are confirmed compatible.
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.