☣️ UN 0074 • CLASS 1
Diazodinitrophenol, wetted
Placard: Explosive 1.1A. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
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Quick details
UN 0074
Class: 1
Placard type: Explosive 1.1A
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m in all directions initially; evacuate 1600m downwind if fire involved; if material has dried out, treat as mass detonation hazard and evacuate 800m minimum
Chemical & Response Details
| 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 |
| Extinguishing | Do not use foam or water streams directly on material; use water spray from distance to keep wetted if safe to approach |
| PPE | ⚠️ Level A with SCBA required; approach only if material remains wetted; do not handle if dried out; remote operations preferred |
| Isolation | ERG 112: isolate 500m in all directions initially; evacuate 1600m downwind if fire involved; if material has dried out, treat as mass detonation hazard and evacuate 800m minimum |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
First actions (field-minded)
- 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.
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UN 0074 — Diazodinitrophenol, wetted HAZMAT RADIO NOTE — UN 0074
Product: Diazodinitrophenol, wetted
Class 1 / Explosive 1.1A / ERG 112
PPE: Level A with SCBA required; approach only if material remains wetted; do not handle if dried out; remote operations preferred
ISOLATION: ERG 112: isolate 500m in all directions initially; evacuate 1600m downwind if fire involved; if material has dried out, treat as mass detonation hazard and evacuate 800m minimum
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 0074 — Diazodinitrophenol, wetted
Class: 1 | Placard: Explosive 1.1A | ERG Guide: 112
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.
Water Reactivity: No significant reaction with water; wetting agent keeps material desensitized
Extinguishing: Do not use foam or water streams directly on material; use water spray from distance to keep wetted if safe to approach
PPE: Level A with SCBA required; approach only if material remains wetted; do not handle if dried out; remote operations preferred
Isolation: ERG 112: isolate 500m in all directions initially; evacuate 1600m downwind if fire involved; if material has dried out, treat as mass detonation hazard and evacuate 800m minimum
— Key Hazards —
• Mass explosion hazard — entire load may detonate simultaneously.
• Severe blast overpressure and fragmentation.
• Sensitive to heat, shock, and friction.
— First Actions —
• 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.
SOURCE: allfirefighter.com/hazmat/un/0074 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0074 Diazodinitrophenol, wetted Cls1 ERG112 | allfirefighter.com/hazmat/un/0074SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/0074
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ
Mass explosion hazard — entire load may detonate simultaneously. Severe blast overpressure and fragmentation. Sensitive to heat, shock, and friction. Secondary fire and debris hazard.
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.
Level A with SCBA required; approach only if material remains wetted; do not handle if dried out; remote operations preferred
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 and your department SOP/SOG for incident-specific protective actions.
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.