UN 3458 — Nitroanisoles, solid
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3458 At a Glance
UN 3458 (Nitroanisoles, solid) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 152. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 3458 is Nitroanisoles, solid, a toxic combustible nitroanisole solid assigned to ERG Guide 152. Isomer identity and dermal exposure must be verified.
Hazard overview: HIGHLY TOXIC methoxy nitroaromatic solid; inhalation, ingestion or skin absorption may cause severe injury. Combustible solid: may burn but does not ignite readily. Molten material can cause severe thermal/chemical burns and increase contact exposure.
Response guidance: For UN 3458, isolate the area, avoid skin contact and use SCBA where vapor, dust, mist or fire is present. Contain runoff and verify controls with SDS/ERG 152.
Firefighter training notes: Training for UN 3458 should emphasize exposure routes, SCBA use, vapor/dust monitoring, decontamination, runoff containment and SDS verification. Use ERG 152, SDS and local SOP.
Regulatory context: Nitroanisoles, solid is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, concentration, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Nitroanisoles, solid should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 3458 Quick Details
Common Hazards of UN 3458
- HIGHLY TOXIC methoxy nitroaromatic solid; inhalation, ingestion or skin absorption may cause severe injury.
- Combustible solid: may burn but does not ignite readily.
- Molten material can cause severe thermal/chemical burns and increase contact exposure.
- Dust, crystals or residue can contaminate clothing, tools and runoff.
- Fire may produce nitrogen oxides, hydrogen halides where applicable and toxic aromatic smoke.
- Runoff may carry persistent toxic nitroaromatic contamination.
- Exact isomer mixture and physical form should be verified from SDS.
Chemical Identity & Physical Properties
Yellowish to pale brown crystalline solid or powder with a faint aromatic odor. May be found as ortho-, meta-, or para- isomers.
| 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 |
Fireground Response Guidance — UN 3458
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA where vapor, dust, mist, smoke or fire is present. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 3458 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers, equipment or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 152, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3458 — Nitroanisoles, solidUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.