☣️ UN 3458 • CLASS 6
UN 3458 — Nitroanisoles, solid
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.
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UN 3458 Quick Details
UN 3458
Product name: Nitroanisoles, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 152 (check current ERG)
Initial isolation: ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300m downwind
Common Hazards of UN 3458
- 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
| Also known as | Mononitro anisolesMethoxy nitrobenzenesNitro methoxybenzenesNitrated anisoles |
| Appearance | Yellowish to pale brown crystalline solid or powder with a faint aromatic odor. May be found as ortho-, meta-, or para- isomers. |
| Flash Point | 132-150C (270-302F) depending on isomer |
| Boiling Point | 258-272C (496-522F) depending on isomer |
| Vapor Density | 5.3 (heavier than air) |
| Water Reactivity | No significant reaction with water; very low solubility |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3458
Extinguishing Media
Dry chemical, CO2, water spray, or foam suitable for Class 6.1 combustibles
PPE Requirements
⚠️ Level B minimum; SCBA required; full chemical-resistant suit to prevent skin absorption; highly toxic by all routes
Isolation & Evacuation
ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 152).
First Actions for a UN 3458 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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 3458 — Nitroanisoles, solidHAZMAT RADIO NOTE — UN 3458
Product: Nitroanisoles, solid
Class 6 / Toxic / ERG 152
PPE: Level B minimum; SCBA required; full chemical-resistant suit to prevent skin absorption; highly toxic by all routes
ISOLATION: ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300m 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 3458 — Nitroanisoles, solid
Class: 6 | Placard: Toxic | ERG Guide: 152
Appearance: Yellowish to pale brown crystalline solid or powder with a faint aromatic odor. May be found as ortho-, meta-, or para- isomers.
Water Reactivity: No significant reaction with water; very low solubility
Extinguishing: Dry chemical, CO2, water spray, or foam suitable for Class 6.1 combustibles
PPE: Level B minimum; SCBA required; full chemical-resistant suit to prevent skin absorption; highly toxic by all routes
Isolation: ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300m 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 —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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/3458 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3458 Nitroanisoles, solid Cls6 ERG152 | ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300 | allfirefighter.com/hazmat/un/3458SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/3458
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Frequently Asked Questions about UN 3458
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.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum; SCBA required; full chemical-resistant suit to prevent skin absorption; highly toxic by all routes
Water reactivity: No significant reaction with water; very low solubility. Recommended extinguishing: Dry chemical, CO2, water spray, or foam suitable for Class 6.1 combustibles.
ERG Guide 152 recommendation: ERG 152: isolate spill 25m all directions; large spill isolate 50m, evacuate 300m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 152 and your department SOP/SOG for incident-specific protective actions.
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.