☣️ UN 1664 • CLASS 6
UN 1664 — Nitrotoluenes, 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.
Nitrotoluenes, liquid is a highly toxic substance that can be fatal if inhaled, ingested, or absorbed through skin. It is a pale yellow to brown oily liquid with a weak 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 25m all directions; for large spill isolate 50m, consider evacuation 300m downwind. If fire, isolate 800m all directions.
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UN 1664 Quick Details
UN 1664
Product name: Nitrotoluenes, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill 25m all directions; for large spill isolate 50m, consider evacuation 300m downwind; if fire isolate 800m all directions
Common Hazards of UN 1664
- 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 brown oily liquid with a weak aromatic odor. Exists as ortho-, meta-, and para-isomers or mixtures thereof at room temperature.
| Also known as | MononitrotolueneMNTNitrotoluolMethylnitrobenzeneToluene mononitrate |
| Appearance | Pale yellow to brown oily liquid with a weak aromatic odor. Exists as ortho-, meta-, and para-isomers or mixtures thereof at room temperature. |
| Flash Point | 106-112C (223-234F) depending on isomer |
| Boiling Point | 222-238C (432-460F) depending on isomer |
| Vapor Density | 4.7 (heavier than air) |
| Water Reactivity | No significant reaction with water; very slightly soluble |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1664
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level A or B minimum; full encapsulating suit for spills; SCBA required; prevent all skin contact as absorbed through skin
Level A or B minimum; full encapsulating suit for spills; SCBA required; prevent all skin contact as absorbed through skin
Isolation & Evacuation
ERG 152: isolate spill 25m all directions; for large spill isolate 50m, consider evacuation 300m downwind; if 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 1664 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 1664 — Nitrotoluenes, liquidHAZMAT RADIO NOTE — UN 1664
Product: Nitrotoluenes, liquid
Class 6 / Toxic / ERG 152
PPE: Level A or B minimum; full encapsulating suit for spills; SCBA required; prevent all skin contact as absorbed through skin
ISOLATION: ERG 152: isolate spill 25m all directions; for large spill isolate 50m, consider evacuation 300m downwind; if 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 1664 — Nitrotoluenes, liquid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Pale yellow to brown oily liquid with a weak aromatic odor. Exists as ortho-, meta-, and para-isomers or mixtures thereof at room temperature.
Water Reactivity: No significant reaction with water; very slightly soluble
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level A or B minimum; full encapsulating suit for spills; SCBA required; prevent all skin contact as absorbed through skin
Isolation: ERG 152: isolate spill 25m all directions; for large spill isolate 50m, consider evacuation 300m downwind; if 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/nitrotoluenes-liquid-un-1664 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1664 Nitrotoluenes, liquid Cls6 ERG152 | allfirefighter.com/hazmat/un/nitrotoluenes-liquid-un-1664SMS / 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/nitrotoluenes-liquid-un-1664
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Frequently Asked Questions about UN 1664
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 or B minimum; full encapsulating suit for spills; SCBA required; prevent all skin contact as absorbed through skin
Isolate spill 25m all directions; for large spill isolate 50m, consider evacuation 300m 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.