☣️ UN 1321 • CLASS 4
UN 1321 — Dinitrophenolates, 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.
🚒☣️
⚠️ 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.
Dinitrophenolates 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: Dinitrophenolates 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 water spray to keep wetted and avoid dry chemical or CO2, which may dry the material. If the material is dried out, treat it as an explosive hazard and evacuate the area immediately.
Advertisement
UN 1321 Quick Details
UN 1321
Product name: Dinitrophenolates, 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 100m all directions initially; if dried out or fire involved, isolate 800m and consider evacuation for 1600m downwind
Common Hazards of UN 1321
- 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
Dinitrophenolates appears as a yellow to orange crystalline solid or powder with a slight phenolic odor.
| Also known as | Dinitrophenol salts wettedDNP saltsDinitrophenolate saltsWetted dinitrophenolates |
| Appearance | Yellow to orange crystalline solid or powder, wetted with water to reduce explosive hazard. Slight phenolic odor. Hygroscopic material that must be kept moist. |
| Flash Point | Not applicable (wetted explosive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; water is used as wetting agent to suppress explosive properties |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1321
Extinguishing Media
Water spray to keep wetted, avoid dry chemical or CO2 which may dry material; flooding amounts of water acceptable
PPE Requirements
⚠️ Level B minimum with SCBA required; structural firefighting gear inadequate; treat dried material as explosive requiring bomb squad protocols
Use Level B minimum with SCBA required; structural firefighting gear is inadequate; treat dried material as explosive requiring bomb squad protocols.
Isolation & Evacuation
ERG 113: isolate 100m all directions initially; if dried out or fire involved, isolate 800m and consider evacuation for 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 1321 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.
Advertisement
📋 Copy & Share Field Card
UN 1321 — Dinitrophenolates, wetted with not lessHAZMAT RADIO NOTE — UN 1321
Product: Dinitrophenolates, wetted with not less than 15% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA required; structural firefighting gear inadequate; treat dried material as explosive requiring bomb squad protocols
ISOLATION: ERG 113: isolate 100m all directions initially; if dried out or fire involved, isolate 800m and consider evacuation for 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 1321 — Dinitrophenolates, wetted with not less than 15% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow to orange crystalline solid or powder, wetted with water to reduce explosive hazard. Slight phenolic odor. Hygroscopic material that must be kept moist.
Water Reactivity: No significant reaction with water; water is used as wetting agent to suppress explosive properties
Extinguishing: Water spray to keep wetted, avoid dry chemical or CO2 which may dry material; flooding amounts of water acceptable
PPE: Level B minimum with SCBA required; structural firefighting gear inadequate; treat dried material as explosive requiring bomb squad protocols
Isolation: ERG 113: isolate 100m all directions initially; if dried out or fire involved, isolate 800m and consider evacuation for 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 —
• 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/1321 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1321 Dinitrophenolates, wetted with not less than 15% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1321SMS / 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/dinitrophenolates-wetted-with-not-un-1321
Advertisement
Frequently Asked Questions about UN 1321
Yes, UN 1321 is a flammable solid.
If UN 1321 dries out, it may become an explosive hazard and require bomb squad protocols.
Handle UN 1321 with 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.