UN 2029 — Hydrazine, anhydrous
Placard: Corrosive. ERG Guide 132. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2029 is Hydrazine, anhydrous, a flammable, toxic and corrosive liquid assigned to ERG Guide 132. Skin absorption, vapor ignition and toxic/corrosive exposure are major concerns.
Hazard overview: FLAMMABLE, TOXIC and CORROSIVE hydrazine liquid; inhalation, ingestion or skin absorption may cause severe injury. Vapors may form explosive mixtures with air and flash back to ignition sources. Liquid and vapor can burn eyes, skin and respiratory tissue; skin absorption is a major hazard.
Response guidance: For a UN 2029 incident, verify the product with shipping papers, container markings, SDS and ERG Guide 132. Establish incident command, isolate the area, stay upwind, control ignition or incompatibility hazards, prevent runoff or vapor spread and base entry/fire-control actions on monitoring and local SOP.
Firefighter training notes: Training for UN 2029 should emphasize hydrazine toxicity, skin absorption, flammable vapor behavior, incompatible oxidizers, vapor monitoring, decontamination and runoff control. Use ERG 132, SDS and local SOP.
Regulatory context: Hydrazine, anhydrous is regulated as a hazardous material for transportation and emergency response purposes. Storage, workplace exposure, emergency planning, spill reporting, waste handling and environmental requirements vary by exact product, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, container markings and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Hydrazine, anhydrous should be stored in compatible tightly closed containers in a cool, ventilated flammable/corrosive area away from oxidizers, acids where incompatible, heat, ignition sources and unauthorized access. Provide spill containment and vapor control.
UN 2029 Quick Details
Common Hazards of UN 2029
- FLAMMABLE, TOXIC and CORROSIVE hydrazine liquid; inhalation, ingestion or skin absorption may cause severe injury.
- Vapors may form explosive mixtures with air and flash back to ignition sources.
- Liquid and vapor can burn eyes, skin and respiratory tissue; skin absorption is a major hazard.
- Reacts with oxidizers and many materials; contamination may cause heat or decomposition.
- Vapors are slightly heavier than air and may collect in low or poorly ventilated areas.
- Fire may produce nitrogen oxides and other irritating/toxic gases.
- Runoff to sewers may create fire, explosion and toxic contamination hazards.
Chemical Identity & Physical Properties
Colorless, oily, fuming liquid with an ammonia-like odor. Highly corrosive and toxic.
| Also known as | HydrazineDiamineHydrazine baseLevoxine |
| CAS Number | 302-01-2 |
| Appearance | Colorless, oily, fuming liquid with an ammonia-like odor. Highly corrosive and toxic. |
| Flash Point | 38C (100F) |
| Boiling Point | 113.5C (236F) |
| Vapor Density | 1.1 (heavier than air) |
| Water Reactivity | Soluble in water; exothermic reaction generates heat |
Fireground Response Guidance — UN 2029
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, mist, fire or confined-space exposure. Chemical-resistant suit, gloves, boots and eye/face protection should be selected from SDS; Level A may be needed for anhydrous or high-concentration hydrazine.
Isolation & Evacuation
First Actions for a UN 2029 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, gas, dust, mist, smoke or fumes and avoid skin or eye contact.
- Eliminate ignition sources if safe and keep vapors and runoff out of drains, sewers, basements and low areas.
- Do not touch damaged containers or spilled/released material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or release area and expand the perimeter for fire involvement, vapor spread, dust spread, cylinder heating or unknown product identity.
- Use ERG Guide 132, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 2029 — Hydrazine, anhydrousUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.