☣️ UN 1238 • CLASS 6
UN 1238 — Methyl chloroformate
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 1238 Quick Details
UN 1238
Product name: Methyl chloroformate
DOT Class: 6
Placard type: Toxic
ERG Guide: 155 (check current ERG)
Initial isolation: ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill; 800m if tank/rail car involved in fire
Common Hazards of UN 1238
- 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 | Chloromethyl formateFormic acid chloromethyl esterMethyl chlorocarbonateMethylchloroformateMCF |
| CAS Number | 79-22-1 |
| Appearance | Colorless liquid with a pungent, irritating odor. Denser than water and volatile at room temperature. |
| Flash Point | 12°C (54°F) |
| Boiling Point | 71°C (160°F) |
| Vapor Density | 3.3 (heavier than air) |
| Water Reactivity | Reacts slowly with water, releasing HCl and CO2; avoid direct water contact, use water spray carefully |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1238
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; water may be ineffective
PPE Requirements
⚠️ Level A or B minimum; full-face SCBA required; chemical-resistant suit; avoid all skin/eye contact
Isolation & Evacuation
ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill; 800m if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 155).
First Actions for a UN 1238 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 1238 — Methyl chloroformateHAZMAT RADIO NOTE — UN 1238
Product: Methyl chloroformate
Class 6 / Toxic / ERG 155
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit; avoid all skin/eye contact
ISOLATION: ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill; 800m if tank/rail car involved in 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 1238 — Methyl chloroformate
Class: 6 | Placard: Toxic | ERG Guide: 155
Appearance: Colorless liquid with a pungent, irritating odor. Denser than water and volatile at room temperature.
Water Reactivity: Reacts slowly with water, releasing HCl and CO2; avoid direct water contact, use water spray carefully
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water may be ineffective
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit; avoid all skin/eye contact
Isolation: ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill; 800m if tank/rail car involved in 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 —
• 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/1238 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1238 Methyl chloroformate Cls6 ERG155 | ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill | allfirefighter.com/hazmat/un/1238SMS / 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/1238
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Frequently Asked Questions about UN 1238
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 A or B minimum; full-face SCBA required; chemical-resistant suit; avoid all skin/eye contact
Water reactivity: Reacts slowly with water, releasing HCl and CO2; avoid direct water contact, use water spray carefully. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical; water may be ineffective.
ERG Guide 155 recommendation: ERG 155: isolate spill 50m all directions; evacuate 300m downwind if large spill; 800m if tank/rail car involved in fire
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.