UN 2431 — Anisidines
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2431 is Anisidines, a toxic aromatic amine entry assigned to ERG Guide 153. Skin absorption and contaminated clothing are major response concerns.
Hazard overview: TOXIC aromatic amine; inhalation, ingestion or skin absorption may cause severe injury. Skin absorption and contaminated clothing are major exposure concerns. Combustible material: may burn but does not ignite readily.
Response guidance: For UN 2431, isolate the area, avoid skin contact and use SCBA where dust, vapor, mist or fire is present. Contain toxic/corrosive runoff and verify exact product controls with SDS and ERG 153.
Firefighter training notes: Training for UN 2431 should emphasize toxic/corrosive exposure routes, skin absorption, SCBA use, decontamination, runoff containment and SDS verification. Use ERG 153, SDS and local SOP.
Regulatory context: Anisidines is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Anisidines should be stored in tightly closed compatible containers in a secure toxic/corrosive-material area with ventilation, secondary containment, restricted access and SDS-based segregation.
UN 2431 Quick Details
Common Hazards of UN 2431
- TOXIC aromatic amine; inhalation, ingestion or skin absorption may cause severe injury.
- Skin absorption and contaminated clothing are major exposure concerns.
- Combustible material: may burn but does not ignite readily.
- Exposure may cause systemic blood/oxygen-carrying effects depending on dose and isomer.
- Fire may produce nitrogen oxides and toxic aromatic amine smoke.
- Runoff may carry toxic contamination.
- Avoid dust, vapor or liquid contact and control decontamination waste.
Chemical Identity & Physical Properties
Colorless to pale yellow or reddish oily liquid or crystalline solid, depending on isomer. Aromatic amine odor. Darkens on exposure to air and light.
| Also known as | AminoanisoleMethoxyanilineMethyl aminophenol etherAnisidine isomers |
| Appearance | Colorless to pale yellow or reddish oily liquid or crystalline solid, depending on isomer. Aromatic amine odor. Darkens on exposure to air and light. |
| Flash Point | 118-141C (244-286F) depending on isomer |
| Boiling Point | 224-254C (435-489F) depending on isomer |
| Vapor Density | 4.2-4.3 (heavier than air) |
| Water Reactivity | No significant reaction with water; slightly soluble |
Fireground Response Guidance — UN 2431
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for dust, vapor, mist, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and clothing; avoid skin contact.
Isolation & Evacuation
First Actions for a UN 2431 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 or spilled material without proper training and PPE.
- Prevent contaminated dust, liquid, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 153, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2431 — AnisidinesUse 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.