UN 2382 — Dimethylhydrazine, symmetrical
Placard: Toxic. ERG Guide 131. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2382 At a Glance
UN 2382 (Dimethylhydrazine, symmetrical) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 131. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.