☣️ UN 1665 • CLASS 6
UN 1665 — Nitroxylenes, liquid
Placard: Toxic. ERG Guide 152. 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.
Nitroxylenes, liquid is a highly toxic substance that can be fatal if inhaled, ingested, or absorbed through skin. It is a pale yellow to amber liquid with a faint aromatic odor.
Hazard overview: Highly toxic, may be fatal if inhaled, ingested, or absorbed through skin. Contact with molten substance may cause severe burns to skin and eyes.
Response guidance: Isolate spill 50m all directions; for large spill isolate 150m and evacuate 800m downwind. If fire, use alcohol-resistant foam, CO2, dry chemical, or water spray for cooling.
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UN 1665 Quick Details
UN 1665
Product name: Nitroxylenes, liquid
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 150m and evacuate 800m downwind
Common Hazards of UN 1665
- 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
Pale yellow to amber liquid with a faint aromatic odor. Denser than water and insoluble in water.
| Also known as | Nitro xyleneNitrated xyleneMononitro xyleneDimethylnitrobenzeneNitrodimethylbenzene |
| Appearance | Pale yellow to amber liquid with a faint aromatic odor. Denser than water and insoluble in water. |
| Flash Point | 127C (261F) |
| Boiling Point | 225-245C (437-473F) depending on isomer |
| Vapor Density | 5.2 (heavier than air) |
| Water Reactivity | No significant reaction with water; insoluble and will sink |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1665
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level A for spill response; SCBA required; chemical-resistant suit mandatory due to extreme skin absorption hazard
Level A for spill response; SCBA required; chemical-resistant suit mandatory due to extreme skin absorption hazard
Isolation & Evacuation
ERG 152: isolate spill 50m all directions; for large spill isolate 150m and evacuate 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 1665 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 1665 — Nitroxylenes, liquidHAZMAT RADIO NOTE — UN 1665
Product: Nitroxylenes, liquid
Class 6 / Toxic / ERG 152
PPE: Level A for spill response; SCBA required; chemical-resistant suit mandatory due to extreme skin absorption hazard
ISOLATION: ERG 152: isolate spill 50m all directions; for large spill isolate 150m and evacuate 800m 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 1665 — Nitroxylenes, liquid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Pale yellow to amber liquid with a faint aromatic odor. Denser than water and insoluble in water.
Water Reactivity: No significant reaction with water; insoluble and will sink
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level A for spill response; SCBA required; chemical-resistant suit mandatory due to extreme skin absorption hazard
Isolation: ERG 152: isolate spill 50m all directions; for large spill isolate 150m and evacuate 800m downwind
— 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/nitroxylenes-liquid-un-1665 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1665 Nitroxylenes, liquid Cls6 ERG152 | allfirefighter.com/hazmat/un/nitroxylenes-liquid-un-1665SMS / 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/nitroxylenes-liquid-un-1665
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Frequently Asked Questions about UN 1665
Highly toxic, may be fatal if inhaled, ingested, or absorbed through skin. Contact with molten substance may cause severe burns to skin and eyes.
Level A for spill response; SCBA required; chemical-resistant suit mandatory due to extreme skin absorption hazard
Isolate spill 50m all directions; for large spill isolate 150m and evacuate 800m downwind
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.