☣️ UN 3425 • CLASS 8
UN 3425 — Bromoacetic acid, solid
Placard: Corrosive. ERG Guide 156. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3425 is Bromoacetic acid, solid, a corrosive and toxic organic acid. It is hygroscopic and can react with water or moisture to release heat and hazardous vapors.
Hazard overview: UN 3425 can cause severe burns and systemic toxicity by skin, eye, inhalation or ingestion exposure. Water contact may release heat and corrosive fumes, while fire can produce hydrogen bromide and other toxic gases. Dust, molten material and contaminated runoff are hazardous.
Response guidance: For UN 3425, isolate the spill, stay upwind and avoid contact with dust or molten material. Use dry chemical, CO2 or sand for small fires; water spray may be used cautiously from a distance to cool containers but should not spread contamination.
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UN 3425 Quick Details
UN 3425
Product name: Bromoacetic acid, solid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate 25-50m all directions; large spill isolate 100m downwind, consider evacuation 300m if involved in fire
Common Hazards of UN 3425
- 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
UN 3425 is a colorless to light tan crystalline solid with a pungent acrid odor. It is hygroscopic and may cake or partially dissolve when exposed to moisture.
| Also known as | Monobromoacetic acidBBAα-Bromoacetic acid2-Bromoacetic acidBromoethanoic acid |
| CAS Number | 79-08-3 |
| Appearance | Colorless to light tan crystalline solid with a pungent, acrid odor. Hygroscopic and corrosive. |
| Flash Point | Not applicable (solid) |
| Boiling Point | 208C (406F) |
| Vapor Density | 4.8 (heavier than air) |
| Water Reactivity | Reacts with water releasing heat and corrosive vapors; may form toxic and flammable gases |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3425
Extinguishing Media
Dry chemical, CO2, sand; use water spray cautiously to cool containers from distance
PPE Requirements
⚠️ Level B minimum; SCBA required; full chemical-resistant suit for large spills or fire involvement
Use SCBA with chemical-resistant acid protective clothing, gloves and boots. Level B is a minimum for most releases; Level A may be needed for large spills, fuming or unknown vapor levels.
Isolation & Evacuation
ERG 156: isolate 25-50m all directions; large spill isolate 100m downwind, consider evacuation 300m if involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 3425 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 3425 — Bromoacetic acid, solidHAZMAT RADIO NOTE — UN 3425
Product: Bromoacetic acid, solid
Class 8 / Corrosive / ERG 156
PPE: Level B minimum; SCBA required; full chemical-resistant suit for large spills or fire involvement
ISOLATION: ERG 156: isolate 25-50m all directions; large spill isolate 100m downwind, consider evacuation 300m if 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 3425 — Bromoacetic acid, solid
Class: 8 | Placard: Corrosive | ERG Guide: 156
Appearance: Colorless to light tan crystalline solid with a pungent, acrid odor. Hygroscopic and corrosive.
Water Reactivity: Reacts with water releasing heat and corrosive vapors; may form toxic and flammable gases
Extinguishing: Dry chemical, CO2, sand; use water spray cautiously to cool containers from distance
PPE: Level B minimum; SCBA required; full chemical-resistant suit for large spills or fire involvement
Isolation: ERG 156: isolate 25-50m all directions; large spill isolate 100m downwind, consider evacuation 300m if involved in fire
— 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/bromoacetic-acid-solid-un-3425 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3425 Bromoacetic acid, solid Cls8 ERG156 | allfirefighter.com/hazmat/un/bromoacetic-acid-solid-un-3425SMS / 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/bromoacetic-acid-solid-un-3425
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Frequently Asked Questions about UN 3425
UN 3425 is Bromoacetic acid, solid. It should be identified from shipping papers, markings and the SDS before responders work near the release.
ERG Guide 156 applies to UN 3425 for initial isolation, protective actions and first-response guidance.
UN 3425 is not primarily classified as flammable, but fire may produce toxic or corrosive gases and containers may become dangerous when heated.
Use SCBA with chemical-resistant acid protective clothing, gloves and boots. Level B is a minimum for most releases; Level A may be needed for large spills, fuming or unknown vapor levels.
UN 3425 can cause severe burns and systemic toxicity by skin, eye, inhalation or ingestion exposure.
For UN 3425, isolate the spill, stay upwind and avoid contact with dust or molten material.
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.