UN 2382 — Dimethylhydrazine, symmetrical
Placard: Toxic. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2382 is Dimethylhydrazine, symmetrical, a highly toxic flammable hydrazine derivative assigned to ERG Guide 131. Skin absorption and vapor ignition require strict controls.
Hazard overview: HIGHLY TOXIC and FLAMMABLE hydrazine derivative; inhalation, ingestion or skin absorption may be fatal. Vapors may ignite and form explosive mixtures with air. Skin absorption and contaminated clothing are major exposure concerns.
Response guidance: For UN 2382, isolate the area, eliminate ignition sources and use SCBA. Keep vapors out of drains, prevent toxic/corrosive runoff and select foam, dry chemical or CO2 using SDS and ERG 131.
Firefighter training notes: Training for UN 2382 should emphasize toxic/corrosive exposure, SCBA use, skin-contact prevention, sewer flashback, decontamination, runoff control and foam selection. Use ERG 131, SDS and local SOP.
Regulatory context: Dimethylhydrazine, symmetrical is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Dimethylhydrazine, symmetrical should be stored in approved flammable/toxic or corrosive-liquid containers with ventilation, secondary containment and separation from heat, ignition sources, oxidizers and incompatible materials.
UN 2382 Quick Details
Common Hazards of UN 2382
- HIGHLY TOXIC and FLAMMABLE hydrazine derivative; inhalation, ingestion or skin absorption may be fatal.
- Vapors may ignite and form explosive mixtures with air.
- Skin absorption and contaminated clothing are major exposure concerns.
- Liquid and vapor can irritate or burn eyes, skin and respiratory tissue.
- Reacts dangerously with oxidizers and some incompatible materials.
- Fire may produce nitrogen oxides and other irritating/toxic gases.
- Runoff may create fire, toxic exposure and environmental contamination hazards.
Chemical Identity & Physical Properties
Clear to pale yellow liquid with an ammonia-like or fishy odor. Hygroscopic and fuming in air.
| Also known as | SDMH1,2-Dimethylhydrazinesym-DimethylhydrazineN,N'-DimethylhydrazineDMH |
| CAS Number | 540-73-8 |
| Appearance | Clear to pale yellow liquid with an ammonia-like or fishy odor. Hygroscopic and fuming in air. |
| Flash Point | 15C (59F) |
| Boiling Point | 87C (189F) |
| Vapor Density | 2.1 (heavier than air) |
| Water Reactivity | Soluble in water; no violent reaction but may release toxic vapors |
Fireground Response Guidance — UN 2382
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and fully encapsulating chemical protection for significant vapor or spill entry. Prevent skin contact; Level A may be required for unknown concentrations.
Isolation & Evacuation
First Actions for a UN 2382 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream; keep responders out of low vapor areas.
- Eliminate ignition sources if this can be done safely.
- Avoid breathing vapor, mist or smoke and avoid skin or eye contact.
- Prevent toxic, alkaline or corrosive runoff from entering drains and waterways.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 131, SDS, shipping papers and air monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2382 — Dimethylhydrazine, symmetricalUse 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.