☣️ UN 1322 • CLASS 4
UN 1322 — Dinitroresorcinol, 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.
Dinitroresorcinol 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: Dinitroresorcinol 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 and fog to keep the material wetted and avoid dry chemical on dry material. If the material is dried out, treat it as a Class 1 explosive and evacuate the area immediately.
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UN 1322 Quick Details
UN 1322
Product name: Dinitroresorcinol, 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 25m all directions; if fire or dried out, treat as Class 1 explosive with extended isolation zones
Common Hazards of UN 1322
- 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
Dinitroresorcinol appears as a yellow to orange crystalline solid with no distinct odor.
| Also known as | Dinitroresorcinol4,6-DinitroresorcinolStyphnic acid2,4-Dinitro-1,3-benzenediolDNR |
| CAS Number | 28464-75-7 |
| Appearance | Yellow to orange crystalline solid with no distinct odor. Wetted with water to reduce explosive sensitivity. |
| Flash Point | Not applicable (explosive solid when dry) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction; water is used as desensitizer |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1322
Extinguishing Media
Water spray, fog; do not allow to dry out; avoid dry chemical on dry material
PPE Requirements
⚠️ Level B minimum; SCBA required; treat as explosive if dried out; avoid friction and shock
Use Level B minimum; SCBA required; treat as explosive if dried out; avoid friction and shock.
Isolation & Evacuation
ERG 113: isolate 25m all directions; if fire or dried out, treat as Class 1 explosive with extended isolation zones
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 1322 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 1322 — Dinitroresorcinol, wetted with not lessHAZMAT RADIO NOTE — UN 1322
Product: Dinitroresorcinol, wetted with not less than 15% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum; SCBA required; treat as explosive if dried out; avoid friction and shock
ISOLATION: ERG 113: isolate 25m all directions; if fire or dried out, treat as Class 1 explosive with extended isolation zones
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 1322 — Dinitroresorcinol, wetted with not less than 15% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow to orange crystalline solid with no distinct odor. Wetted with water to reduce explosive sensitivity.
Water Reactivity: No significant reaction; water is used as desensitizer
Extinguishing: Water spray, fog; do not allow to dry out; avoid dry chemical on dry material
PPE: Level B minimum; SCBA required; treat as explosive if dried out; avoid friction and shock
Isolation: ERG 113: isolate 25m all directions; if fire or dried out, treat as Class 1 explosive with extended isolation zones
— 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/1322 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1322 Dinitroresorcinol, wetted with not less than 15% water Cls4 ERG113 | allfirefighter.com/hazmat/un/1322SMS / 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/dinitroresorcinol-wetted-with-not-un-1322
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Frequently Asked Questions about UN 1322
Yes, UN 1322 is a flammable solid.
If UN 1322 dries out, it may become a Class 1 explosive and require extended isolation zones.
Handle UN 1322 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.