UN 2904 — Chlorophenolates, liquid
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2904 is Chlorophenolates, liquid, a broad toxic corrosive chlorophenolate entry assigned to ERG Guide 154. Exact salt/solution and SDS must be verified.
Hazard overview: TOXIC and CORROSIVE chlorophenolate material; skin, eye or respiratory contact may cause severe injury. Dust, solution or splashes can contaminate clothing, tools and runoff. Generally non-flammable, but heating may produce toxic chlorinated phenolic smoke and hydrogen chloride.
Response guidance: For UN 2904, isolate the area, avoid skin contact and use SCBA where dust, vapor, aerosol or fire is present. Contain toxic runoff and verify controls with SDS and ERG 154.
Firefighter training notes: Training for UN 2904 should emphasize exposure routes, SCBA use, vapor/dust monitoring, decontamination, runoff containment and SDS/package verification. Use ERG 154, SDS and local SOP.
Regulatory context: Chlorophenolates, liquid is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on package type, quantity, formulation and jurisdiction; verify shipping papers, SDS or authority guidance.
Storage & handling: Chlorophenolates, liquid should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2904 Quick Details
Common Hazards of UN 2904
- TOXIC and CORROSIVE chlorophenolate material; skin, eye or respiratory contact may cause severe injury.
- Dust, solution or splashes can contaminate clothing, tools and runoff.
- Generally non-flammable, but heating may produce toxic chlorinated phenolic smoke and hydrogen chloride.
- Liquid entries may be strongly alkaline or phenolic solutions; solid entries may form corrosive solutions in water.
- Runoff may be toxic, corrosive, persistent and harmful to waterways.
- Exact salt, solvent and concentration should be verified from SDS.
- Avoid dust generation, aerosols and unprotected skin contact.
Chemical Identity & Physical Properties
Liquid solution typically amber to dark brown in color, may have a phenolic or chemical odor, corrosive alkaline aqueous solution at room temperature.
| Also known as | Chlorophenol saltsChlorinated phenol saltsChlorophenol alkali metal saltsSodium chlorophenolatePotassium chlorophenolate |
| Appearance | Liquid solution typically amber to dark brown in color, may have a phenolic or chemical odor, corrosive alkaline aqueous solution at room temperature. |
| Flash Point | Not applicable (aqueous solution, non-flammable) |
| Boiling Point | Approximately 100C (212F) for aqueous solutions |
| Vapor Density | Not applicable (liquid solution) |
| Water Reactivity | Already in aqueous solution; highly corrosive alkaline pH causes tissue damage on contact |
Fireground Response Guidance — UN 2904
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A or B may be needed for unknown formulation, heavy vapor/dust or skin-absorption risk.
Isolation & Evacuation
First Actions for a UN 2904 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, gas, mist, smoke or aerosols and avoid skin or eye contact.
- Do not touch damaged containers 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 154, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2904 — Chlorophenolates, liquidUse 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.