☣️ UN 3484 • CLASS 8
UN 3484 — Hydrazine aqueous solution, flammable, with more than 37% hydrazine
Placard: Corrosive. ERG Guide 132. 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 3484 covers aqueous hydrazine solution with more than 37% hydrazine, a reactive flammable and corrosive liquid.
Hazard overview: Hydrazine vapors can ignite, form explosive mixtures, and cause severe inhalation, skin, and eye hazards. The liquid is corrosive and toxic.
Response guidance: Isolate the area, remove ignition sources, ventilate from upwind, and use alcohol-resistant foam, dry chemical, or CO2. Cool containers with water spray.
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UN 3484 Quick Details
UN 3484
Product name: Hydrazine aqueous solution, flammable, with more than 37% hydrazine
DOT Class: 8
Placard type: Corrosive
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind; evacuate immediate area if fire involves tank car or trailer
Common Hazards of UN 3484
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
Chemical Identity & Physical Properties
Hydrazine aqueous solution is a colorless to pale yellow, fuming liquid with an ammonia-like odor.
| Also known as | Hydrazine hydrateDiamineHydrazine monohydrateLevoxine |
| CAS Number | 302-01-2 |
| Appearance | Colorless to pale yellow, fuming liquid with an ammonia-like odor. Hygroscopic and highly reactive. Fumes in moist air. |
| Flash Point | 38C (100F) for 64% solution; varies with concentration |
| Boiling Point | 113.5C (236F) for pure hydrazine hydrate |
| Vapor Density | 1.1 (heavier than air) |
| Water Reactivity | Miscible with water; dilution generates heat but does not react violently |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3484
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; use water spray to cool containers
PPE Requirements
⚠️ Level A minimum for concentrated solutions; SCBA required; full chemical-resistant suit; avoid all skin contact due to severe corrosivity and carcinogenicity
Level A is recommended for concentrated leaks or unknown exposure. SCBA and full chemical-resistant suit are required for significant response.
Isolation & Evacuation
ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind; evacuate immediate area if fire involves tank car or trailer
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 3484 Incident
- CALL 911. Then call the emergency response number on the shipping paper, if available.
- 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 50 meters (150 feet) in all directions.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials, increase the downwind precautionary distance as conditions require.
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📋 Copy & Share Field Card
UN 3484 — Hydrazine aqueous solution, flammable, wHAZMAT RADIO NOTE — UN 3484
Product: Hydrazine aqueous solution, flammable, with more than 37% hydrazine
Class 8 / Corrosive / ERG 132
PPE: Level A minimum for concentrated solutions; SCBA required; full chemical-resistant suit; avoid all skin contact due to severe corrosivity and carcinogenicity
ISOLATION: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind; evacuate immediate area if fire involves tank car or trailer
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 3484 — Hydrazine aqueous solution, flammable, with more than 37% hydrazine
Class: 8 | Placard: Corrosive | ERG Guide: 132
Appearance: Colorless to pale yellow, fuming liquid with an ammonia-like odor. Hygroscopic and highly reactive. Fumes in moist air.
Water Reactivity: Miscible with water; dilution generates heat but does not react violently
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; use water spray to cool containers
PPE: Level A minimum for concentrated solutions; SCBA required; full chemical-resistant suit; avoid all skin contact due to severe corrosivity and carcinogenicity
Isolation: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind; evacuate immediate area if fire involves tank car or trailer
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
— First Actions —
• CALL 911. Then call the emergency response number on the shipping paper, if available.
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/hydrazine-aqueous-solution-flammable-un-3484 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3484 Hydrazine aqueous solution, flammable, with more than 37% hydrazine Cls8 ERG132 | allfirefighter.com/hazmat/un/hydrazine-aqueous-solution-flammable-un-3484SMS / 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/hydrazine-aqueous-solution-flammable-un-3484
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Frequently Asked Questions about UN 3484
Yes. It is flammable and can be ignited by heat, sparks, or flames.
It is miscible with water and dilution may release heat, but violent reaction is not expected under normal dilution conditions.
Level A with SCBA and full chemical-resistant protection is recommended for concentrated solution incidents.
Isolate at least 50 m, remove ignition sources, stay upwind, and cool exposed containers.
UN 3484 is assigned to ERG Guide 132 for initial emergency response guidance.
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.