UN 2669 — Chlorocresols, solution
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2669 is Chlorocresols, solution, a variable toxic phenolic solution assigned to ERG Guide 152. Solvent/concentration affects fire and exposure hazards.
Hazard overview: TOXIC phenolic solution; inhalation, ingestion or skin absorption may cause severe injury. Solution may be water, alcohol or solvent based; flash point and fire behavior vary by carrier. Skin contact and contaminated clothing are major exposure concerns.
Response guidance: For UN 2669, isolate the area, avoid skin contact and use SCBA where dust, vapor, mist or fire is present. Control ignition or moisture hazards as applicable and contain toxic/corrosive runoff.
Firefighter training notes: Training for UN 2669 should emphasize toxic exposure routes, SCBA use, dust/vapor monitoring, fire behavior, decontamination, runoff containment and SDS verification. Use ERG 152, SDS and local SOP.
Regulatory context: Chlorocresols, solution 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: Chlorocresols, solution should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2669 Quick Details
Common Hazards of UN 2669
- TOXIC phenolic solution; inhalation, ingestion or skin absorption may cause severe injury.
- Solution may be water, alcohol or solvent based; flash point and fire behavior vary by carrier.
- Skin contact and contaminated clothing are major exposure concerns.
- Combustible or flammable behavior depends on concentration and solvent.
- Fire may produce hydrogen chloride, phenolic smoke and other toxic/corrosive gases.
- Runoff may be toxic, corrosive and harmful to waterways.
- Exact chlorocresol isomer, solvent and concentration must be verified from SDS.
Chemical Identity & Physical Properties
Clear to pale yellow liquid with a phenolic, medicinal odor. May be dissolved in water, alcohol, or other solvents.
| Also known as | Chlorinated cresolPCMCPara-chloro-meta-cresolChlorocresol solutionChloro-cresylic acid |
| CAS Number | 1319-77-3 |
| Appearance | Clear to pale yellow liquid with a phenolic, medicinal odor. May be dissolved in water, alcohol, or other solvents. |
| Flash Point | Varies by solvent; typically 43-93C (110-200F) depending on concentration and carrier |
| Boiling Point | 235C (455F) for pure chlorocresol; solution boiling point depends on solvent |
| Vapor Density | 4.4 (heavier than air for chlorocresol vapor) |
| Water Reactivity | No significant reaction with water; dissolves in water to form toxic solutions |
Fireground Response Guidance — UN 2669
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and full chemical protective clothing. Level A may be needed for heavy vapor, splash risk or unknown concentrations; avoid skin contact.
Isolation & Evacuation
First Actions for a UN 2669 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 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 2669 — Chlorocresols, 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.