UN 3411 — Naphthylamine (beta), solution
Placard: Toxic. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3411 is Naphthylamine (beta), solution, a toxic solution of 2-naphthylamine normally carried in an organic solvent. Because beta-naphthylamine is associated with serious chronic health risk, responders should treat any release as a high-exposure-control incident until the exact solvent and concentration are confirmed.
Hazard overview: UN 3411 presents a severe toxic exposure hazard by inhalation, ingestion and skin contact. Vapors or aerosols from the solution may irritate the eyes and respiratory tract, while liquid contact can contaminate skin and protective clothing. Fire can produce toxic and corrosive smoke, and solvent carriers may add a combustible or flammable vapor hazard.
Response guidance: For a UN 3411 release, isolate the area, stay upwind, prevent entry to low areas and identify the solvent from shipping papers or the SDS. Avoid direct contact, control ignition sources if the carrier solvent is combustible, and use alcohol-resistant foam, dry chemical or CO2 for fire control when appropriate. Keep contaminated runoff out of drains and waterways.
UN 3411 Quick Details
Common Hazards of UN 3411
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- 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.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
UN 3411 is shipped as a solution; the pure substance is a white to reddish crystalline solid that darkens with air or light. The transport form may be a clear to colored liquid with a faint aromatic odor, depending on the carrier solvent and concentration.
| Also known as | 2-Naphthylaminebeta-Naphthylamine2-Aminonaphthaleneβ-Naphthylamine |
| CAS Number | 91-59-8 |
| Appearance | White to reddish crystalline solid when pure, darkens on exposure to air and light. Faint aromatic odor. Typically shipped as a solution in organic solvents. |
| Flash Point | Depends on solvent carrier; typically 23-60C (73-140F) for common organic solutions |
| Boiling Point | 306C (583F) for pure substance |
| Vapor Density | 5.0 (heavier than air) for vapor from solution |
| Water Reactivity | No significant reaction; slightly soluble in water |
Fireground Response Guidance — UN 3411
Extinguishing Media
PPE Requirements
Use SCBA and chemical-resistant protective clothing suitable for toxic organic solutions. Level A or Level B protection may be required when vapor concentration, solvent identity or splash risk is unknown; avoid all skin contact and decontaminate exposed equipment carefully.
Isolation & Evacuation
First Actions for a UN 3411 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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
📋 Copy & Share Field Card
UN 3411 — Naphthylamine (beta), solutionUse 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.