☣️ UN 3293 • CLASS 6
UN 3293 — Hydrazine, aqueous solution, with not more than 37% hydrazine
Placard: Toxic. ERG Guide 153. 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.
Hydrazine, aqueous solution, with not more than 37% hydrazine is a toxic, corrosive hydrazine solution. Even diluted hydrazine can create serious inhalation, skin absorption and fire-related vapor hazards.
Hazard overview: Hydrazine solution can injure skin, eyes and the respiratory tract, and vapors may be harmful in confined or low areas. Heating can produce toxic gases and increase pressure in containers.
Response guidance: Isolate the spill, remove ignition sources, avoid direct water streams on the release and use compatible foam, CO2 or dry chemical for fire control. Decontaminate exposed personnel promptly.
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UN 3293 Quick Details
UN 3293
Product name: Hydrazine, aqueous solution, with not more than 37% hydrazine
DOT Class: 6
Placard type: Toxic
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 25-50m; evacuate 100m downwind if large spill; 800m evacuation if tank/rail car involved in fire
Common Hazards of UN 3293
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury.
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be toxic, corrosive or environmentally harmful.
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion.
Chemical Identity & Physical Properties
Colorless, fuming liquid with an ammonia-like odor. Hygroscopic and corrosive. May appear slightly yellow if impure.
| Also known as | Hydrazine hydrateDiamineHydrazine monohydrateHydrazinium hydroxide |
| CAS Number | 302-01-2 |
| Appearance | Colorless, fuming liquid with an ammonia-like odor. Hygroscopic and corrosive. May appear slightly yellow if impure. |
| Flash Point | 38C (100F) for 35% solution |
| Boiling Point | 119C (246F) for 64% solution; varies with concentration |
| Vapor Density | 1.1 (slightly heavier than air) |
| Water Reactivity | Miscible with water; dilution generates heat but no violent reaction |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3293
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; avoid direct water spray on spills
PPE Requirements
⚠️ Level B minimum with SCBA; full chemical-resistant suit; neoprene or butyl rubber gloves; face shield
Level B minimum with SCBA; full chemical-resistant suit; neoprene or butyl rubber gloves; face shield.
Isolation & Evacuation
ERG 153: isolate spill 25-50m; evacuate 100m downwind if large spill; 800m evacuation if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 3293 Incident
- CALL 911, then contact the emergency response telephone number shown on shipping papers, 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials, increase downwind protective distance based on conditions and incident command guidance.
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📋 Copy & Share Field Card
UN 3293 — Hydrazine, aqueous solution, with not moHAZMAT RADIO NOTE — UN 3293
Product: Hydrazine, aqueous solution, with not more than 37% hydrazine
Class 6 / Toxic / ERG 153
PPE: Level B minimum with SCBA; full chemical-resistant suit; neoprene or butyl rubber gloves; face shield
ISOLATION: ERG 153: isolate spill 25-50m; evacuate 100m downwind if large spill; 800m evacuation if tank/rail car involved in fire
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 3293 — Hydrazine, aqueous solution, with not more than 37% hydrazine
Class: 6 | Placard: Toxic | ERG Guide: 153
Appearance: Colorless, fuming liquid with an ammonia-like odor. Hygroscopic and corrosive. May appear slightly yellow if impure.
Water Reactivity: Miscible with water; dilution generates heat but no violent reaction
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; avoid direct water spray on spills
PPE: Level B minimum with SCBA; full chemical-resistant suit; neoprene or butyl rubber gloves; face shield
Isolation: ERG 153: isolate spill 25-50m; evacuate 100m downwind if large spill; 800m evacuation if tank/rail car involved in fire
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury.
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— First Actions —
• CALL 911, then contact the emergency response telephone number shown on shipping papers, 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-with-un-3293 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3293 Hydrazine, aqueous solution, with not more than 37% hydrazine Cls6 ERG153 | allfirefighter.com/hazmat/un/hydrazine-aqueous-solution-with-un-3293SMS / 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-with-un-3293
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Frequently Asked Questions about UN 3293
UN 3293 is Hydrazine, aqueous solution, with not more than 37% hydrazine, assigned to ERG Guide 153 and placarded as Toxic.
Yes. Hydrazine aqueous solution presents a serious toxic exposure hazard; avoid inhalation, ingestion, skin contact and contaminated runoff.
Yes, corrosive effects are possible. Avoid skin and eye contact and use chemical-resistant protection.
Use caution. Miscible with water; dilution generates heat but no violent reaction
Alcohol-resistant foam, CO2, dry chemical; avoid direct water spray on spills.
Level B minimum with SCBA; full chemical-resistant suit; neoprene or butyl rubber gloves; face shield.
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.