☣️ UN 1067 • CLASS 2
Dinitrogen tetroxide
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 1067
Class: 2
Placard type: Toxic Gas
ERG: Guide 124 (check current ERG)
Isolation: ERG 124: Initial isolation 100m all directions; protect persons downwind 800m daytime, 2400m nighttime for large spills
Chemical & Response Details
| Also known as | Nitrogen tetroxideNitrogen peroxideNTODinitrogen tetraoxideNitrogen dioxide dimer |
| CAS Number | 10544-72-6 |
| Appearance | Red-brown fuming liquid or yellowish-brown gas with a pungent, acrid odor. Exists in equilibrium with nitrogen dioxide. Liquid below 21°C (70°F). |
| Flash Point | Not applicable (oxidizer) |
| Boiling Point | 21°C (70°F) |
| Vapor Density | 3.2 (heavier than air) |
| Water Reactivity | Reacts with water forming nitric and nitrous acids; reaction generates heat and corrosive fumes |
| Extinguishing | Do not use water directly on liquid; use water spray from distance to cool containers; dry chemical for small fires |
| PPE | ⚠️ Level A required for spill response; SCBA mandatory; full chemical protective suit; severe inhalation and contact hazard |
| Isolation | ERG 124: Initial isolation 100m all directions; protect persons downwind 800m daytime, 2400m nighttime for large spills |
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 1067 — Dinitrogen tetroxide HAZMAT RADIO NOTE — UN 1067
Product: Dinitrogen tetroxide
Class 2 / Toxic Gas / ERG 124
PPE: Level A required for spill response; SCBA mandatory; full chemical protective suit; severe inhalation and contact hazard
ISOLATION: ERG 124: Initial isolation 100m all directions; protect persons downwind 800m daytime, 2400m nighttime 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 1067 — Dinitrogen tetroxide
Class: 2 | Placard: Toxic Gas | ERG Guide: 124
Appearance: Red-brown fuming liquid or yellowish-brown gas with a pungent, acrid odor. Exists in equilibrium with nitrogen dioxide. Liquid below 21°C (70°F).
Water Reactivity: Reacts with water forming nitric and nitrous acids; reaction generates heat and corrosive fumes
Extinguishing: Do not use water directly on liquid; use water spray from distance to cool containers; dry chemical for small fires
PPE: Level A required for spill response; SCBA mandatory; full chemical protective suit; severe inhalation and contact hazard
Isolation: ERG 124: Initial isolation 100m all directions; protect persons downwind 800m daytime, 2400m nighttime for large spills
— 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/1067 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1067 Dinitrogen tetroxide Cls2 ERG124 | ERG 124: Initial isolation 100m all directions; protect persons downwind 800m da | allfirefighter.com/hazmat/un/1067SMS / 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/1067
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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 for spill response; SCBA mandatory; full chemical protective suit; severe inhalation and contact hazard
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.