☣️ UN 3376 • CLASS 4
4-Nitrophenylhydrazine, with not less than 30% water
Placard: Flammable Solid. 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.
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Quick details
UN 3376
Class: 4
Placard type: Flammable Solid
ERG: Guide 113 (check current ERG)
Isolation: ERG 113: isolate 25-50m initially; if dried out or in fire, treat as explosive - isolate 800m and evacuate 1600m downwind
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
- 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. Specifically,
- Contact may cause burns to skin and eyes.
- Fire may produce irritating, corrosive and/or toxic gases.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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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UN 3376 — 4-Nitrophenylhydrazine, with not less th HAZMAT RADIO NOTE — UN 3376
Product: 4-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 — 4-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
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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/3376 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3376 4-Nitrophenylhydrazine, with not less than 30% water Cls4 ERG113 | allfirefighter.com/hazmat/un/3376SMS / 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/3376
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FAQ
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 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. Specifically, Contact may cause burns to skin and eyes. Fire may produce irritating, corrosive and/or toxic gases.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA; full protective clothing required; avoid contact with dried material which is shock-sensitive
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 113 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.