☣️ UN 1780 • CLASS 8
UN 1780 — Fumaryl chloride
Placard: Corrosive. 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.
Fumaryl chloride is a highly corrosive and toxic substance that can cause severe injuries and burns. It is essential to handle it with caution and follow proper emergency response procedures.
Hazard overview: Inhalation, ingestion, or skin contact with fumaryl chloride may cause severe injury, and the substance can react violently with water, releasing flammable, toxic, or corrosive gases and runoff.
Response guidance: In case of an emergency, isolate the spill area, and consider evacuation if necessary. Use dry chemical, CO2, or dry sand for fires, and avoid using water or foam.
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UN 1780 Quick Details
UN 1780
Product name: Fumaryl chloride
DOT Class: 8
Placard type: Corrosive
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
Common Hazards of UN 1780
- 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
Fumaryl chloride is a colorless to pale yellow liquid with a pungent, acrid odor, fuming in moist air due to hydrolysis.
| Also known as | Fumaroyl dichlorideFumaric acid dichloridetrans-1,2-Ethylenedicarboxylic acid dichloride2-Butenedioyl dichloride |
| CAS Number | 627-63-4 |
| Appearance | Colorless to pale yellow liquid with a pungent, acrid odor. Fumes in moist air due to hydrolysis. |
| Flash Point | 102C (216F) |
| Boiling Point | 160C (320F) with decomposition |
| Vapor Density | 5.3 (much heavier than air) |
| Water Reactivity | Reacts violently with water producing hydrochloric acid and fumaric acid; avoid water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1780
Extinguishing Media
Dry chemical, CO2, or dry sand; do not use water or foam
PPE Requirements
⚠️ Level B minimum with full face SCBA; acid-resistant suit required; avoid all skin/eye contact
Level B protection is required, including full face SCBA, acid-resistant suit, and avoiding all skin and eye contact.
Isolation & Evacuation
ERG 156: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 1780 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 1780 — Fumaryl chlorideHAZMAT RADIO NOTE — UN 1780
Product: Fumaryl chloride
Class 8 / Corrosive / ERG 156
PPE: Level B minimum with full face SCBA; acid-resistant suit required; avoid all skin/eye contact
ISOLATION: ERG 156: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
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 1780 — Fumaryl chloride
Class: 8 | Placard: Corrosive | ERG Guide: 156
Appearance: Colorless to pale yellow liquid with a pungent, acrid odor. Fumes in moist air due to hydrolysis.
Water Reactivity: Reacts violently with water producing hydrochloric acid and fumaric acid; avoid water contact
Extinguishing: Dry chemical, CO2, or dry sand; do not use water or foam
PPE: Level B minimum with full face SCBA; acid-resistant suit required; avoid all skin/eye contact
Isolation: ERG 156: isolate spill 25-50m; if tank/rail car involved in fire, isolate 800m all directions
— 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/fumaryl-chloride-un-1780 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1780 Fumaryl chloride Cls8 ERG156 | allfirefighter.com/hazmat/un/fumaryl-chloride-un-1780SMS / 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/fumaryl-chloride-un-1780
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Frequently Asked Questions about UN 1780
Yes, UN 1780 is combustible and can burn, but it does not ignite readily.
UN 1780 is corrosive and toxic, and can cause severe injury through inhalation, ingestion, or skin contact.
Isolate the spill area, and consider evacuation if necessary, use dry chemical or CO2 for fires, and avoid using water or foam.
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.