☣️ UN 1752 • CLASS 6
UN 1752 — Chloroacetyl chloride
Placard: Toxic. ERG Guide 156. 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.
Chloroacetyl chloride is a highly toxic and corrosive substance that requires immediate attention in the event of a spill. It is essential to take precautions to avoid exposure.
Hazard overview: Inhalation, ingestion, or skin contact with chloroacetyl chloride may cause severe injury. The substance is highly corrosive and can cause severe burns.
Response guidance: Isolate the spill area immediately and evacuate the surrounding area. Wear Level B PPE and use a SCBA to prevent exposure.
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UN 1752 Quick Details
UN 1752
Product name: Chloroacetyl chloride
DOT Class: 6
Placard type: Toxic
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation 1600m downwind
Common Hazards of UN 1752
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- 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.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
Chloroacetyl chloride is a colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor.
| Also known as | Chloroacetyl chlorideMonochloroacetyl chlorideChloroacetic acid chlorideChloroacetic chloride2-Chloroacetyl chloride |
| CAS Number | 79-04-9 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor. Releases dense white vapors when exposed to moist air. |
| Flash Point | 126°F (52°C) |
| Boiling Point | 106°C (223°F) |
| Vapor Density | 4.0 (heavier than air) |
| Water Reactivity | Reacts violently with water releasing hydrogen chloride (HCl) gas and corrosive/toxic fumes; do not use water directly on material |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1752
Extinguishing Media
CO2, dry chemical, or dry sand; avoid water-based agents due to violent reaction
PPE Requirements
⚠️ Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin/eye contact due to severe corrosive burns
Wear Level B minimum PPE, including SCBA, and a full chemical-resistant suit to prevent exposure.
Isolation & Evacuation
ERG 156: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 1752 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 1752 — Chloroacetyl chlorideHAZMAT RADIO NOTE — UN 1752
Product: Chloroacetyl chloride
Class 6 / Toxic / ERG 156
PPE: Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin/eye contact due to severe corrosive burns
ISOLATION: ERG 156: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation 1600m downwind
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 1752 — Chloroacetyl chloride
Class: 6 | Placard: Toxic | ERG Guide: 156
Appearance: Colorless to pale yellow fuming liquid with a pungent, acrid, irritating odor. Releases dense white vapors when exposed to moist air.
Water Reactivity: Reacts violently with water releasing hydrogen chloride (HCl) gas and corrosive/toxic fumes; do not use water directly on material
Extinguishing: CO2, dry chemical, or dry sand; avoid water-based agents due to violent reaction
PPE: Level B minimum required; SCBA mandatory; full chemical-resistant suit; avoid all skin/eye contact due to severe corrosive burns
Isolation: ERG 156: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation 1600m downwind
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— 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/1752 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1752 Chloroacetyl chloride Cls6 ERG156 | ERG 156: isolate spill 50m all directions; if tank/rail car involved in fire, is | allfirefighter.com/hazmat/un/1752SMS / 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/chloroacetyl-chloride-un-1752
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Frequently Asked Questions about UN 1752
Yes, UN 1752 is a combustible material.
Yes, UN 1752 is an eye irritant.
No, UN 1752 should not be extinguished with water due to violent reaction.
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.