☣️ UN 1662 • CLASS 6
UN 1662 — Nitrobenzene
Placard: Toxic. ERG Guide 152. 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.
Nitrobenzene is a highly toxic substance that can cause severe burns to skin and eyes. It is a pale yellow to brown oily liquid with a characteristic almond-like or shoe polish odor.
Hazard overview: Nitrobenzene is highly toxic and can cause severe burns to skin and eyes. Contact with molten substance may cause severe burns to skin and eyes.
Response guidance: In case of emergency, isolate the spill 50m all directions. Use alcohol-resistant foam, CO2, dry chemical, water spray for cooling to extinguish the fire.
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UN 1662 Quick Details
UN 1662
Product name: Nitrobenzene
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind; if tank/rail car involved in fire isolate 800m all directions
Common Hazards of UN 1662
- 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
- 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
Nitrobenzene is a pale yellow to brown oily liquid with a characteristic almond-like or shoe polish odor.
| Also known as | NitrobenzolOil of mirbaneEssence of mirbaneNB |
| CAS Number | 98-95-3 |
| Appearance | Pale yellow to brown oily liquid with a characteristic almond-like or shoe polish odor. Denser than water and sinks. |
| Flash Point | 88C (190F) |
| Boiling Point | 211C (412F) |
| Vapor Density | 4.2 (heavier than air) |
| Water Reactivity | No significant reaction; insoluble in water but may slowly hydrolyze in presence of bases |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1662
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum with SCBA; full chemical protective clothing required for spills; avoid all skin contact due to absorption hazard
Level B minimum with SCBA; full chemical protective clothing required for spills; avoid all skin contact due to absorption hazard
Isolation & Evacuation
ERG 152: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind; if tank/rail car involved in fire isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 1662 Incident
- 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 measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1662 — NitrobenzeneHAZMAT RADIO NOTE — UN 1662
Product: Nitrobenzene
Class 6 / Toxic / ERG 152
PPE: Level B minimum with SCBA; full chemical protective clothing required for spills; avoid all skin contact due to absorption hazard
ISOLATION: ERG 152: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind; if tank/rail car involved in fire isolate 800m all directions
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 1662 — Nitrobenzene
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Pale yellow to brown oily liquid with a characteristic almond-like or shoe polish odor. Denser than water and sinks.
Water Reactivity: No significant reaction; insoluble in water but may slowly hydrolyze in presence of bases
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum with SCBA; full chemical protective clothing required for spills; avoid all skin contact due to absorption hazard
Isolation: ERG 152: isolate spill 50m all directions; for large spill isolate 100m, evacuate 500m downwind; if tank/rail car involved in fire isolate 800m all directions
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/nitrobenzene-un-1662 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1662 Nitrobenzene Cls6 ERG152 | allfirefighter.com/hazmat/un/nitrobenzene-un-1662SMS / 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/nitrobenzene-un-1662
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Frequently Asked Questions about UN 1662
No, UN 1662 Nitrobenzene is not flammable.
Yes, contact with molten substance may cause severe burns to skin and eyes.
No, UN 1662 Nitrobenzene is insoluble in water.
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.