☣️ UN 3376 • CLASS 4
UN 3376 — Nitrophenylhydrazine, with not less than 30% water
Placard: Flammable Solid. ERG Guide 113. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ 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.
UN 3376 is Nitrophenylhydrazine, with not less than 30% water, assigned to ERG Guide 113. First responders should verify the shipping papers and SDS, isolate the area, and base entry, PPE and control tactics on the product's listed hazards.
Hazard overview: The main hazard is a wetted energetic solid that may burn and can become explosive if dried out, heated, shocked, or contaminated.
Response guidance: For UN 3376, isolate the area, avoid shock and friction, prevent drying, cool exposed containers from distance, and treat dried or burning material as an explosive hazard.
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UN 3376 Quick Details
UN 3376
Product name: Nitrophenylhydrazine, with not less than 30% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate 25-50m initially; if dried out or in fire, treat as explosive - isolate 800m and evacuate 1600m downwind
Common Hazards of UN 3376
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an explosive hazard.
- Keep material wet with water or treat as an explosive (GUIDE 112).
- Runoff to sewer may create fire or explosion hazard.
- Some are toxic and may be fatal if inhaled, ingested or absorbed through skin.
- Contact may cause burns to skin and eyes.
- Fire may produce irritating, corrosive and/or toxic gases.
Chemical Identity & Physical Properties
Red to orange-brown crystalline solid with a characteristic odor. Shipped as a wetted paste with at least 30% water to reduce explosion hazard.
| Also known as | p-Nitrophenylhydrazine4-NPHpara-Nitrophenylhydrazine1-(4-Nitrophenyl)hydrazine |
| CAS Number | 100-16-3 |
| Appearance | Red to orange-brown crystalline solid with a characteristic odor. Shipped as a wetted paste with at least 30% water to reduce explosion hazard. |
| Flash Point | Not applicable (wetted solid) |
| Boiling Point | Decomposes before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water is used as desensitizer |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3376
Extinguishing Media
Water spray to keep containers cool; dry chemical or CO2 for small fires; avoid disturbing dried material
PPE Requirements
⚠️ Level B minimum with SCBA; full protective clothing required; avoid contact with dried material which is shock-sensitive
Level B minimum with SCBA; full protective clothing required; avoid contact with dried material which is shock-sensitive.
Isolation & Evacuation
ERG 113: isolate 25-50m initially; if dried out or in fire, treat as explosive - isolate 800m and evacuate 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3376 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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area immediately for at least 100 meters (330 feet) in all directions.
- Consider initial evacuation for 500 meters (1/3 mile) in all directions.
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📋 Copy & Share Field Card
UN 3376 — Nitrophenylhydrazine, with not less thanHAZMAT RADIO NOTE — UN 3376
Product: Nitrophenylhydrazine, with not less than 30% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA; full protective clothing required; avoid contact with dried material which is shock-sensitive
ISOLATION: ERG 113: isolate 25-50m initially; if dried out or in fire, treat as explosive - isolate 800m and evacuate 1600m downwind
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 3376 — Nitrophenylhydrazine, with not less than 30% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Red to orange-brown crystalline solid with a characteristic odor. Shipped as a wetted paste with at least 30% water to reduce explosion hazard.
Water Reactivity: No significant reaction with water; water is used as desensitizer
Extinguishing: Water spray to keep containers cool; dry chemical or CO2 for small fires; avoid disturbing dried material
PPE: Level B minimum with SCBA; full protective clothing required; avoid contact with dried material which is shock-sensitive
Isolation: ERG 113: isolate 25-50m initially; if dried out or in fire, treat as explosive - isolate 800m and evacuate 1600m downwind
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an explosive hazard.
— First Actions —
• 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/nitrophenylhydrazine-with-not-un-3376 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3376 Nitrophenylhydrazine, with not less than 30% water Cls4 ERG113 | allfirefighter.com/hazmat/un/nitrophenylhydrazine-with-not-un-3376SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/nitrophenylhydrazine-with-not-un-3376
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Frequently Asked Questions about UN 3376
UN 3376 is Nitrophenylhydrazine, with not less than 30% water. It is assigned to ERG Guide 113 for initial emergency response.
The wetting or desensitizing agent lowers explosion sensitivity. If the material dries out, it may become shock-, friction-, or heat-sensitive.
It is shipped desensitized or wetted, but dried or heated material should be treated as an explosive hazard.
Cool containers from a distance and prevent drying. Do not disturb dried material; request specialist explosive/hazmat support.
SCBA and protective clothing are needed, but distance and isolation are the primary protection if drying, fire or explosion risk is present.
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.