☣️ UN 3369 • CLASS 4
UN 3369 — Sodium dinitro-o-cresolate, wetted with not less than 10% water
Placard: Flammable Solid. ERG Guide 113. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
Sodium dinitro-o-cresolate, wetted with not less than 10% water is shipped wetted to reduce explosive sensitivity. The water content is a critical safety control.
Hazard overview: The material may burn and can become explosive if it dries out or is exposed to heat, flame, friction or shock. Toxic decomposition products may be produced in fire.
Response guidance: Keep the material wet, avoid friction or impact and treat any dried residue as explosive. Isolate the area and follow ERG 113 or explosive guidance if fire is involved.
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UN 3369 Quick Details
UN 3369
Product name: Sodium dinitro-o-cresolate, wetted with not less than 10% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate spill 25-50m; if dry or fire involved, isolate 800m initially, protect 1600m downwind
Common Hazards of UN 3369
- 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 dried material as an explosive.
- 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
Yellow to orange crystalline solid or powder. Slight phenolic odor. Shipped as a wetted paste or slurry to reduce explosion hazard.
| Also known as | DNOC sodium saltDinitro-o-cresol sodium saltSodium 4,6-dinitro-o-cresolateDinitro-ortho-cresol sodium salt wetted |
| CAS Number | 2312-76-7 |
| Appearance | Yellow to orange crystalline solid or powder. Slight phenolic odor. Shipped as a wetted paste or slurry to reduce explosion hazard. |
| Flash Point | Not applicable when wetted (dry material is explosive rather than flammable) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; wetting agent used as safety measure |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3369
Extinguishing Media
Dry chemical, sand, or foam may be used on wetted material; keep wet to prevent explosion hazard
PPE Requirements
⚠️ Level B minimum with SCBA; full protective clothing; avoid all sources of ignition; treat dried material as explosive
Use SCBA, full protective clothing and face protection; keep distance and avoid handling dried or contaminated residue.
Isolation & Evacuation
ERG 113: isolate spill 25-50m; if dry or fire involved, isolate 800m initially, protect 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3369 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 3369 — Sodium dinitro-o-cresolate, wetted withHAZMAT RADIO NOTE — UN 3369
Product: Sodium dinitro-o-cresolate, wetted with not less than 10% water
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with SCBA; full protective clothing; avoid all sources of ignition; treat dried material as explosive
ISOLATION: ERG 113: isolate spill 25-50m; if dry or fire involved, isolate 800m initially, protect 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 3369 — Sodium dinitro-o-cresolate, wetted with not less than 10% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: Yellow to orange crystalline solid or powder. Slight phenolic odor. Shipped as a wetted paste or slurry to reduce explosion hazard.
Water Reactivity: No significant reaction with water; wetting agent used as safety measure
Extinguishing: Dry chemical, sand, or foam may be used on wetted material; keep wet to prevent explosion hazard
PPE: Level B minimum with SCBA; full protective clothing; avoid all sources of ignition; treat dried material as explosive
Isolation: ERG 113: isolate spill 25-50m; if dry or fire involved, isolate 800m initially, protect 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 dried material as an explosive.
— 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/sodium-dinitro-o-cresolate-un-3369 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3369 Sodium dinitro-o-cresolate, wetted with not less than 10% water Cls4 ERG113 | allfirefighter.com/hazmat/un/sodium-dinitro-o-cresolate-un-3369SMS / 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/sodium-dinitro-o-cresolate-un-3369
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Frequently Asked Questions about UN 3369
UN 3369 is the entry for Sodium dinitro-o-cresolate, wetted with not less than 10% water.
Water reduces sensitivity and helps prevent explosive behavior from drying.
Dried material may become explosive if heated, shocked, struck or exposed to friction.
Water spray or fog may be used to keep material wet; avoid actions that spread contamination or cause impact.
SCBA and full protective clothing are required; responders should maintain distance due to explosive potential.
ERG Guide 113 applies initially, with explosive guidance if material is dry or fire-involved.
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.