UN 1736 — Benzoyl chloride
Placard: Corrosive. ERG Guide 137. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1736 is Benzoyl chloride, a hazardous material assigned to ERG Guide 137. Responders should verify the exact product with shipping papers, package markings and SDS before close action.
Hazard overview: UN 1736 presents corrosive, toxic, flammable or reactive hazards depending on the product and incident conditions. Use ERG, SDS and incident command to set isolation, PPE and control actions.
Response guidance: For a UN 1736 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 137. Establish incident command, isolate the area, stay upwind, prevent incompatible contact, control runoff and choose entry or fire-control actions based on monitoring, SDS and local SOP.
Firefighter training notes: Training for UN 1736 should emphasize corrosive/toxic exposure routes, air monitoring, PPE selection, decontamination, runoff containment and compatible extinguishing decisions. Use ERG 137, SDS and local SOP.
Regulatory context: Benzoyl chloride is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by concentration, formulation, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Benzoyl chloride should be stored in tightly closed compatible containers in a secure, cool, dry, well-ventilated hazardous-material area according to SDS and local procedures.
UN 1736 Quick Details
Common Hazards of UN 1736
- CORROSIVE material; inhalation, ingestion or skin/eye contact may cause severe injury.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff may be corrosive and may pollute waterways.
- Containers may rupture or fail when heated.
- Specific hazards depend on the exact product, concentration and SDS.
Chemical Identity & Physical Properties
Clear to slightly yellow liquid with a pungent, irritating odor. Fumes in moist air due to reaction with atmospheric moisture.
| Also known as | Benzenecarbonyl chlorideBenzene carbonyl chlorideAlpha-chlorobenzaldehydeBenzoic acid chloride |
| CAS Number | 98-88-4 |
| Appearance | Clear to slightly yellow liquid with a pungent, irritating odor. Fumes in moist air due to reaction with atmospheric moisture. |
| Flash Point | 72°C (162°F) |
| Boiling Point | 197°C (387°F) |
| Vapor Density | 4.9 (heavier than air) |
| Water Reactivity | Reacts violently with water producing hydrochloric acid and benzoic acid with heat generation; avoid water contact |
Fireground Response Guidance — UN 1736
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for mist, vapor, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing selected from SDS for corrosive liquid contact.
Isolation & Evacuation
First Actions for a UN 1736 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, fumes, dust or mist and avoid skin or eye contact.
- Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or leak area and expand the perimeter if vapor, dust, fire involvement, water reaction or unknown concentration is present.
- Use ERG Guide 137, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1736 — Benzoyl chlorideUse 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.