☣️ UN 1182 • CLASS 6
UN 1182 — Ethyl chloroformate
Placard: Toxic. ERG Guide 155. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
Ethyl chloroformate is a highly flammable and toxic substance that requires careful handling. It is a colorless to pale yellow liquid with a pungent, irritating odor that is highly volatile and corrosive.
Hazard overview: Ethyl chloroformate is highly flammable and can be easily ignited by heat, sparks, or flames. Vapors form explosive mixtures with air, posing explosion hazards indoors, outdoors, and in sewers.
Response guidance: In case of a spill, isolate the area immediately and use alcohol-resistant foam, CO2, or dry chemical for extinguishing. Wear a Level B minimum with SCBA and a chemical-resistant suit required, as the material is corrosive and toxic.
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UN 1182 Quick Details
UN 1182
Product name: Ethyl chloroformate
DOT Class: 6
Placard type: Toxic
ERG Guide: 155 (check current ERG)
Initial isolation: ERG 155: isolate spill 50m all directions; for large spills isolate 150m, evacuate 800m downwind if fire
Common Hazards of UN 1182
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapors may travel to source of ignition and flash back.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
Chemical Identity & Physical Properties
Ethyl chloroformate is a colorless to pale yellow liquid with a pungent, irritating odor that is highly volatile and corrosive.
| Also known as | Chloroformic acid ethyl esterEthyl chlorocarbonateCarbonochloridic acid ethyl esterECF |
| CAS Number | 541-41-3 |
| Appearance | Colorless to pale yellow liquid with a pungent, irritating odor. Highly volatile and corrosive. |
| Flash Point | -4°C (25°F) |
| Boiling Point | 93-95°C (199-203°F) |
| Vapor Density | 3.8 (heavier than air) |
| Water Reactivity | Reacts with water releasing HCl gas and CO2; avoid direct water contact on material |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1182
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only
PPE Requirements
⚠️ Level B minimum with SCBA; chemical-resistant suit required; material is corrosive and toxic
Wear a Level B minimum with SCBA and a chemical-resistant suit required, as ethyl chloroformate is corrosive and toxic.
Isolation & Evacuation
ERG 155: isolate spill 50m all directions; for large spills isolate 150m, evacuate 800m downwind if fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 155).
First Actions for a UN 1182 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 1182 — Ethyl chloroformateHAZMAT RADIO NOTE — UN 1182
Product: Ethyl chloroformate
Class 6 / Toxic / ERG 155
PPE: Level B minimum with SCBA; chemical-resistant suit required; material is corrosive and toxic
ISOLATION: ERG 155: isolate spill 50m all directions; for large spills isolate 150m, evacuate 800m downwind if fire
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1182 — Ethyl chloroformate
Class: 6 | Placard: Toxic | ERG Guide: 155
Appearance: Colorless to pale yellow liquid with a pungent, irritating odor. Highly volatile and corrosive.
Water Reactivity: Reacts with water releasing HCl gas and CO2; avoid direct water contact on material
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only
PPE: Level B minimum with SCBA; chemical-resistant suit required; material is corrosive and toxic
Isolation: ERG 155: isolate spill 50m all directions; for large spills isolate 150m, evacuate 800m downwind if fire
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
• Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1182 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1182 Ethyl chloroformate Cls6 ERG155 | ERG 155: isolate spill 50m all directions; for large spills isolate 150m, evacua | allfirefighter.com/hazmat/un/1182SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/ethyl-chloroformate-un-1182
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Frequently Asked Questions about UN 1182
Yes, UN 1182 is corrosive and can cause damage to skin and eyes on contact.
UN 1182 reacts with water, releasing HCl gas and CO2, and should avoid direct water contact on the material.
Isolate the spill area 50m in all directions, and evacuate 800m downwind if there is a fire.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.