UN 2667 — Butyltoluenes
Placard: Toxic. ERG Guide 152. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2667 is Butyltoluenes, a toxic combustible aromatic isomer group assigned to ERG Guide 152. Exact isomer/SDS affects flash point and exposure hazards.
Hazard overview: TOXIC combustible aromatic hydrocarbon liquid; inhalation, ingestion or skin contact may cause injury. Combustible liquid; vapors may ignite when heated and form mixtures with air. Vapors are heavier than air and may collect in low or confined areas.
Response guidance: For UN 2667, 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 2667 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: Butyltoluenes 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: Butyltoluenes should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2667 Quick Details
Common Hazards of UN 2667
- TOXIC combustible aromatic hydrocarbon liquid; inhalation, ingestion or skin contact may cause injury.
- Combustible liquid; vapors may ignite when heated and form mixtures with air.
- Vapors are heavier than air and may collect in low or confined areas.
- Liquid is insoluble and may float, spreading contamination or fire across water.
- Fire may produce carbon monoxide and irritating/toxic aromatic smoke.
- Runoff may carry hydrocarbon contamination.
- Exact isomer affects flash point, toxicity and physical behavior; verify SDS.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with an aromatic hydrocarbon odor. Exists as various isomeric forms.
| Also known as | butyl toluenebutyltoluene isomersmethylbutylbenzenebutylmethylbenzene |
| Appearance | Colorless to pale yellow liquid with an aromatic hydrocarbon odor. Exists as various isomeric forms. |
| Flash Point | 52-68°C (126-154°F) depending on isomer |
| Boiling Point | 190-205°C (374-401°F) depending on isomer |
| Vapor Density | 5.1 (heavier than air) |
| Water Reactivity | No significant reaction with water; insoluble and floats on water |
Fireground Response Guidance — UN 2667
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 protective clothing.
Isolation & Evacuation
First Actions for a UN 2667 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.
- Eliminate ignition sources if this can be done safely.
- 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 2667 — ButyltoluenesUse 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.