☣️ UN 1320 • CLASS 4
UN 1320 — Dinitrophenol, wetted with not less than 15% 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.
Dinitrophenol is a highly toxic substance that requires careful handling to prevent exposure. It is essential to keep the material wetted with not less than 15% water to prevent explosion.
Hazard overview: Dinitrophenol is highly toxic by skin absorption and may be ignited by heat, sparks, or flames. It is a flammable/combustible material that requires special precautions.
Response guidance: In case of fire, use dry chemical, water spray to keep wetted, and CO2 for small fires only. If the material is dried out, treat it as an explosive hazard and evacuate the area immediately.
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UN 1320 Quick Details
UN 1320
Product name: Dinitrophenol, wetted with not less than 15% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: Isolate spill 50m all directions. If fire or dried material suspected, isolate 800m and evacuate 1600m downwind immediately. Treat any dried material as explosive hazard.
Common Hazards of UN 1320
- 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.
Chemical Identity & Physical Properties
Dinitrophenol appears as a yellow crystalline solid with a sweet, musty odor.
| Also known as | 2,4-DinitrophenolDNPDinitrophenol wettedSolfo Blackα-Dinitrophenol |
| CAS Number | 25550-58-7 |
| Appearance | Yellow crystalline solid with a sweet, musty odor. Appears as a wetted material with at least 15% water for safe transport. |
| Flash Point | Not applicable (wetted solid) |
| Boiling Point | Decomposes at 108-112C (226-234F) before boiling |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water used as desensitizer to prevent explosion |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1320
Extinguishing Media
Dry chemical, water spray to keep wetted (never allow to dry), CO2 for small fires only
PPE Requirements
⚠️ Level B minimum with SCBA; full turnout gear. Highly toxic by skin absorption. Use extreme caution to prevent material from drying out.
Use Level B minimum with SCBA; full turnout gear to prevent exposure and ignition.
Isolation & Evacuation
ERG 113: Isolate spill 50m all directions. If fire or dried material suspected, isolate 800m and evacuate 1600m downwind immediately. Treat any dried material as explosive hazard.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 1320 Incident
- 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 1320 — Dinitrophenol, wetted with not less thanHAZMAT RADIO NOTE — UN 1320
Product: Dinitrophenol, wetted with not less than 15% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA; full turnout gear. Highly toxic by skin absorption. Use extreme caution to prevent material from drying out.
ISOLATION: ERG 113: Isolate spill 50m all directions. If fire or dried material suspected, isolate 800m and evacuate 1600m downwind immediately. Treat any dried material as explosive hazard.
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 1320 — Dinitrophenol, wetted with not less than 15% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow crystalline solid with a sweet, musty odor. Appears as a wetted material with at least 15% water for safe transport.
Water Reactivity: No significant reaction with water; water used as desensitizer to prevent explosion
Extinguishing: Dry chemical, water spray to keep wetted (never allow to dry), CO2 for small fires only
PPE: Level B minimum with SCBA; full turnout gear. Highly toxic by skin absorption. Use extreme caution to prevent material from drying out.
Isolation: ERG 113: Isolate spill 50m all directions. If fire or dried material suspected, isolate 800m and evacuate 1600m downwind immediately. Treat any dried material as explosive hazard.
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/1320 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1320 Dinitrophenol, wetted with not less than 15% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1320SMS / 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/dinitrophenol-wetted-with-not-un-1320
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Frequently Asked Questions about UN 1320
Yes, UN 1320 is a flammable solid.
If UN 1320 dries out, it may become an explosive hazard and require bomb squad protocols.
Handle UN 1320 with extreme caution to prevent drying out, as it may ignite by heat, sparks, or flames.
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.