UN 0074 — Diazodinitrophenol, wetted
Placard: Explosive 1.1A. ERG Guide 112. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 0074 is Diazodinitrophenol (DDNP), wetted, a primary explosive classified as Class 1.1A with a mass explosion hazard placard. It is shipped wetted with water or alcohol specifically to reduce its extreme sensitivity to heat, shock, and friction.
Hazard overview: UN 0074 presents a mass explosion hazard in which the entire load may detonate simultaneously, producing severe blast overpressure and fragmentation. If the wetting agent has evaporated and the material has dried out, it becomes highly sensitive and must be treated as an immediate mass detonation hazard.
Response guidance: Isolate a minimum of 500 meters in all directions upon arrival, and expand the evacuation zone to 1,600 meters downwind if fire is involved or imminent. Do not apply foam or direct water streams to the material; instead, use water spray from a safe distance only to maintain wetting if approach is possible.
UN 0074 Quick Details
Common Hazards of UN 0074
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
Chemical Identity & Physical Properties
Diazodinitrophenol appears as a yellow to orange crystalline solid or powder with no odor or a slight characteristic odor, and is highly sensitive to detonation when dry.
| Also known as | DDNPDinolDiazo dinitrophenol2-Diazo-4,6-dinitrophenolExplosive D |
| CAS Number | 87-31-0 |
| Appearance | Yellow to orange crystalline solid or powder. Odorless or slight characteristic odor. Highly sensitive explosive when dry; shipped wetted with water or alcohol to reduce sensitivity. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes explosively) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; wetting agent keeps material desensitized |
Fireground Response Guidance — UN 0074
Extinguishing Media
PPE Requirements
Level A personal protective equipment with SCBA is required for UN 0074 incidents, and personnel must not handle the material if it appears dried out, with remote operations strongly preferred.
Isolation & Evacuation
First Actions for a UN 0074 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Establish large isolation zone — minimum 500 meters in all directions.
- Stage upwind, uphill; limit personnel to essential responders only.
- Request Hazmat + law enforcement + additional resources immediately.
- Do not fight fire — evacuate and isolate; let burn if no life safety risk.
- Protect exposures only if safe and directed by command.
- Consult current ERG Guide 112 and follow SOP/SOG.
📋 Copy & Share Field Card
UN 0074 — Diazodinitrophenol, wettedUse 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.