☣️ UN 1181 • CLASS 6
UN 1181 — Ethyl chloroacetate
Placard: Toxic. ERG Guide 155. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
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UN 1181 Quick Details
UN 1181
Product name: Ethyl chloroacetate
DOT Class: 6
Placard type: Toxic
ERG Guide: 155 (check current ERG)
Initial isolation: ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind if fire or major leak
Common Hazards of UN 1181
- 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
| Also known as | Ethyl chloroacetateChloroacetic acid ethyl esterEthyl monochloroacetateEthyl α-chloroacetate |
| CAS Number | 105-39-5 |
| Appearance | Clear, colorless liquid with a pungent, fruity odor. Denser than water and immiscible with water. |
| Flash Point | 54°C (129°F) |
| Boiling Point | 144°C (291°F) |
| Vapor Density | 4.3 (heavier than air) |
| Water Reactivity | Slowly hydrolyzes in water to produce hydrochloric acid and glycolic acid; no violent reaction but will form corrosive products over time |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1181
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE Requirements
⚠️ Level B minimum with SCBA; full chemical-resistant suit for spill response. Toxic by inhalation, ingestion, and skin absorption.
Isolation & Evacuation
ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind if fire or major leak
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 155).
First Actions for a UN 1181 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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 1181 — Ethyl chloroacetateHAZMAT RADIO NOTE — UN 1181
Product: Ethyl chloroacetate
Class 6 / Toxic / ERG 155
PPE: Level B minimum with SCBA; full chemical-resistant suit for spill response. Toxic by inhalation, ingestion, and skin absorption.
ISOLATION: ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind if fire or major leak
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 1181 — Ethyl chloroacetate
Class: 6 | Placard: Toxic | ERG Guide: 155
Appearance: Clear, colorless liquid with a pungent, fruity odor. Denser than water and immiscible with water.
Water Reactivity: Slowly hydrolyzes in water to produce hydrochloric acid and glycolic acid; no violent reaction but will form corrosive products over time
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum with SCBA; full chemical-resistant suit for spill response. Toxic by inhalation, ingestion, and skin absorption.
Isolation: ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind if fire or major leak
— 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 —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/1181 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1181 Ethyl chloroacetate Cls6 ERG155 | ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuat | allfirefighter.com/hazmat/un/1181SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1181
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Frequently Asked Questions about UN 1181
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.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA; full chemical-resistant suit for spill response. Toxic by inhalation, ingestion, and skin absorption.
Water reactivity: Slowly hydrolyzes in water to produce hydrochloric acid and glycolic acid; no violent reaction but will form corrosive products over time. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling.
ERG Guide 155 recommendation: ERG 155: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind if fire or major leak
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 155 and your department SOP/SOG for incident-specific protective actions.
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.