☣️ UN 3443 • CLASS 6
UN 3443 — Dinitrobenzenes, solid
Placard: Toxic. ERG Guide 152. 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.
UN 3443 Dinitrobenzenes, solid is assigned to ERG Guide 152. The exact risk depends on the shipment form, concentration and SDS, but responders should verify shipping papers before committing crews.
Hazard overview: Primary hazards for UN 3443 include: Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.; Contact with molten substance may cause severe burns to skin and eyes.; Avoid any skin contact. Control ignition sources, avoid direct contact and keep personnel upwind.
Response guidance: For a UN 3443 incident, isolate the area, deny entry, stay upwind and use ERG Guide 152 with the shipping papers or SDS. Use compatible extinguishing media only and prevent contaminated runoff from spreading.
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UN 3443 Quick Details
UN 3443
Product name: Dinitrobenzenes, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill/leak area 25-50m all directions; if fire/large spill isolate 800m downwind; highly toxic fumes produced when heated
Common Hazards of UN 3443
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental contamination.
- Combustible material: may burn but does not ignite readily.
- Containers may explode when heated.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
Chemical Identity & Physical Properties
UN 3443 is described as: Pale yellow to tan crystalline solid with a mild aromatic odor. May appear as white to light yellow needles or powder depending on isomer.
| Also known as | DNBdinitrobenzolm-dinitrobenzeneo-dinitrobenzenep-dinitrobenzenebenzene dinitro isomers |
| Appearance | Pale yellow to tan crystalline solid with a mild aromatic odor. May appear as white to light yellow needles or powder depending on isomer. |
| Flash Point | 150C (302F) - varies by isomer, combustible solid |
| Boiling Point | 288-299C (550-570F) depending on isomer |
| Vapor Density | 5.8 (heavier than air when vaporized) |
| Water Reactivity | No significant reaction with water; slightly soluble |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3443
Extinguishing Media
Dry chemical, CO2, water spray (from distance), foam suitable for non-water-reactive materials
PPE Requirements
⚠️ Level A or B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
PPE guidance for UN 3443: Level A or B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
Isolation & Evacuation
ERG 152: isolate spill/leak area 25-50m all directions; if fire/large spill isolate 800m downwind; highly toxic fumes produced when heated
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 3443 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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials, increase the immediate precautionary distance in the downwind direction as conditions require.
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📋 Copy & Share Field Card
UN 3443 — Dinitrobenzenes, solidHAZMAT RADIO NOTE — UN 3443
Product: Dinitrobenzenes, solid
Class 6 / Toxic / ERG 152
PPE: Level A or B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
ISOLATION: ERG 152: isolate spill/leak area 25-50m all directions; if fire/large spill isolate 800m downwind; highly toxic fumes produced when heated
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 3443 — Dinitrobenzenes, solid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Pale yellow to tan crystalline solid with a mild aromatic odor. May appear as white to light yellow needles or powder depending on isomer.
Water Reactivity: No significant reaction with water; slightly soluble
Extinguishing: Dry chemical, CO2, water spray (from distance), foam suitable for non-water-reactive materials
PPE: Level A or B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
Isolation: ERG 152: isolate spill/leak area 25-50m all directions; if fire/large spill isolate 800m downwind; highly toxic fumes produced when heated
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters.
SOURCE: allfirefighter.com/hazmat/un/dinitrobenzenes-solid-un-3443 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3443 Dinitrobenzenes, solid Cls6 ERG152 | allfirefighter.com/hazmat/un/dinitrobenzenes-solid-un-3443SMS / 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/dinitrobenzenes-solid-un-3443
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Frequently Asked Questions about UN 3443
UN 3443 is Dinitrobenzenes, solid, a Class 6 hazardous material assigned to ERG Guide 152.
UN 3443 may burn or support fire depending on the product and fire conditions. Keep ignition sources away and follow ERG 152.
No significant reaction with water; slightly soluble
Level A or B minimum; SCBA required; full chemical-resistant suit to prevent any skin contact; highly toxic by all routes of exposure
ERG 152: isolate spill/leak area 25-50m all directions; if fire/large spill isolate 800m downwind; highly toxic fumes produced when heated
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.