☣️ UN 3472 • CLASS 8
UN 3472 — Crotonic acid, liquid
Placard: Corrosive. ERG Guide 153. 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.
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UN 3472 Quick Details
UN 3472
Product name: Crotonic acid, liquid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 3472
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
| Also known as | trans-2-Butenoic acidβ-Methylacrylic acidtrans-Crotonic acid2-Butenoic acid |
| CAS Number | 3724-65-0 |
| Appearance | Colorless to pale yellow liquid or crystalline solid (melts near room temperature at 72°C). Has a pungent, irritating odor. |
| Flash Point | 88°C (190°F) |
| Boiling Point | 185°C (365°F) |
| Vapor Density | 3.0 (heavier than air) |
| Water Reactivity | Soluble in water; no violent reaction but solution is corrosive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3472
Extinguishing Media
Dry chemical, CO2, water spray, alcohol-resistant foam
PPE Requirements
⚠️ Level B minimum; SCBA required; full chemical-resistant suit for liquid contact; corrosive to skin and eyes
Isolation & Evacuation
ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 3472 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 3472 — Crotonic acid, liquidHAZMAT RADIO NOTE — UN 3472
Product: Crotonic acid, liquid
Class 8 / Corrosive / ERG 153
PPE: Level B minimum; SCBA required; full chemical-resistant suit for liquid contact; corrosive to skin and eyes
ISOLATION: ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
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 3472 — Crotonic acid, liquid
Class: 8 | Placard: Corrosive | ERG Guide: 153
Appearance: Colorless to pale yellow liquid or crystalline solid (melts near room temperature at 72°C). Has a pungent, irritating odor.
Water Reactivity: Soluble in water; no violent reaction but solution is corrosive
Extinguishing: Dry chemical, CO2, water spray, alcohol-resistant foam
PPE: Level B minimum; SCBA required; full chemical-resistant suit for liquid contact; corrosive to skin and eyes
Isolation: ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— 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/3472 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3472 Crotonic acid, liquid Cls8 ERG153 | ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, is | allfirefighter.com/hazmat/un/3472SMS / 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/3472
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Frequently Asked Questions about UN 3472
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears). Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
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; SCBA required; full chemical-resistant suit for liquid contact; corrosive to skin and eyes
Water reactivity: Soluble in water; no violent reaction but solution is corrosive. Recommended extinguishing: Dry chemical, CO2, water spray, alcohol-resistant foam.
ERG Guide 153 recommendation: ERG 153: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 153 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.