UN 2407 — Isopropyl chloroformate
Placard: Toxic. ERG Guide 155. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2407 is Isopropyl chloroformate, a toxic flammable corrosive chloroformate assigned to ERG Guide 155. Moisture can release HCl, CO2 and heat.
Hazard overview: TOXIC, FLAMMABLE and CORROSIVE chloroformate liquid; inhalation or skin contact may cause severe injury. Vapors may ignite and form explosive mixtures with air. Reacts with water or moisture, releasing hydrogen chloride, carbon dioxide and heat.
Response guidance: For UN 2407, isolate the area, remove ignition sources and use SCBA. Control water contact because moisture can release HCl and CO2; contain corrosive runoff and confirm tactics with SDS and ERG 155.
Firefighter training notes: Training for UN 2407 should emphasize moisture reaction, corrosive fuming or hydrolysis, flammable vapor control, PPE selection, runoff containment and decontamination. Use ERG 155, SDS and local SOP.
Regulatory context: Isopropyl chloroformate 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: Isopropyl chloroformate should be stored in tightly closed compatible containers in a cool, dry, ventilated toxic/flammable/corrosive area away from water, moisture, heat, ignition sources, bases and oxidizers.
UN 2407 Quick Details
Common Hazards of UN 2407
- TOXIC, FLAMMABLE and CORROSIVE chloroformate liquid; inhalation or skin contact may cause severe injury.
- Vapors may ignite and form explosive mixtures with air.
- Reacts with water or moisture, releasing hydrogen chloride, carbon dioxide and heat.
- Vapors are heavier than air and may travel to ignition sources and flash back.
- Liquid and vapor are lachrymatory and corrosive to eyes, skin and respiratory tissue.
- Fire may produce hydrogen chloride, phosgene-type gases and other toxic/corrosive smoke.
- Containers may rupture or explode when heated or contaminated with water.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with a pungent, irritating odor. Corrosive and lachrymatory (tear-producing) properties.
| Also known as | Isopropyl chlorocarbonateChloroformic acid isopropyl ester1-Methylethyl chloroformateIsopropoxycarbonyl chloride |
| CAS Number | 108-23-6 |
| Appearance | Colorless to pale yellow liquid with a pungent, irritating odor. Corrosive and lachrymatory (tear-producing) properties. |
| Flash Point | -17C (1F) |
| Boiling Point | 105C (221F) |
| Vapor Density | 4.3 (heavier than air) |
| Water Reactivity | Reacts with water releasing HCl (hydrochloric acid) and carbon dioxide; violent reaction with moisture |
Fireground Response Guidance — UN 2407
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing; avoid skin contact.
Isolation & Evacuation
First Actions for a UN 2407 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; keep responders out of low vapor areas.
- Eliminate ignition sources if this can be done safely.
- Avoid breathing vapor, mist or smoke and avoid skin or eye contact.
- Keep water contact controlled because moisture can increase decomposition, heat or corrosive fuming.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 155, SDS, shipping papers and air monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2407 — Isopropyl chloroformateUse 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.