☣️ UN 1066 • CLASS 2
Nitrogen, compressed
Placard: Non-Flammable Gas. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
Quick details
UN 1066
Class: 2
Placard type: Non-Flammable Gas
ERG: Guide 120 (check current ERG)
Isolation: ERG 120: No evacuation distances for small releases; ventilate confined spaces; monitor oxygen levels below 19.5% and evacuate; asphyxiation hazard in enclosed areas
Chemical & Response Details
| Also known as | N2Nitrogen gasCompressed nitrogenDinitrogenLiquid nitrogen (when cryogenic) |
| CAS Number | 7727-37-9 |
| Appearance | Colorless, odorless, tasteless gas at room temperature. Non-flammable and chemically inert under normal conditions. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -196C (-321F) at atmospheric pressure |
| Vapor Density | 0.97 (slightly lighter than air as gas, but vapors from liquefied nitrogen are initially heavier than air) |
| Water Reactivity | No reaction with water; chemically inert |
| Extinguishing | Not applicable (non-flammable); inert gas extinguishes fires by displacing oxygen |
| PPE | ⚠️ Level D minimum for gas; insulated gloves and face shield required when handling liquefied or cryogenic nitrogen to prevent frostbite; SCBA required in oxygen-deficient atmospheres |
| Isolation | ERG 120: No evacuation distances for small releases; ventilate confined spaces; monitor oxygen levels below 19.5% and evacuate; asphyxiation hazard in enclosed areas |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
- Non-flammable gases.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
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.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
Advertisement
📋 Copy & Share
UN 1066 — Nitrogen, compressed HAZMAT RADIO NOTE — UN 1066
Product: Nitrogen, compressed
Class 2 / Non-Flammable Gas / ERG 120
PPE: Level D minimum for gas; insulated gloves and face shield required when handling liquefied or cryogenic nitrogen to prevent frostbite; SCBA required in oxygen-deficient atmospheres
ISOLATION: ERG 120: No evacuation distances for small releases; ventilate confined spaces; monitor oxygen levels below 19.5% and evacuate; asphyxiation hazard in enclosed areas
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 1066 — Nitrogen, compressed
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 120
Appearance: Colorless, odorless, tasteless gas at room temperature. Non-flammable and chemically inert under normal conditions.
Water Reactivity: No reaction with water; chemically inert
Extinguishing: Not applicable (non-flammable); inert gas extinguishes fires by displacing oxygen
PPE: Level D minimum for gas; insulated gloves and face shield required when handling liquefied or cryogenic nitrogen to prevent frostbite; SCBA required in oxygen-deficient atmospheres
Isolation: ERG 120: No evacuation distances for small releases; ventilate confined spaces; monitor oxygen levels below 19.5% and evacuate; asphyxiation hazard in enclosed areas
— Key Hazards —
• Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
• Vapors from liquefied gas are initially heavier than air and spread along ground.
• Contact with gas, liquefied gas or cryogenic liquids 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/1066 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1066 Nitrogen, compressed Cls2 ERG120 | ERG 120: No evacuation distances for small releases; ventilate confined spaces; | allfirefighter.com/hazmat/un/1066SMS / 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/1066
Advertisement
FAQ
Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite. Non-flammable gases. Containers may explode when heated. Ruptured cylinders may rocket.
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 D minimum for gas; insulated gloves and face shield required when handling liquefied or cryogenic nitrogen to prevent frostbite; SCBA required in oxygen-deficient atmospheres
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 120 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.