UN 2669 — Chlorocresols, solution
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2669 At a Glance
UN 2669 (Chlorocresols, solution) 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 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.