☣️ UN 1647 • CLASS 6

UN 1647 — Methyl bromide and ethylene dibromide mixture, liquid

Placard: Toxic. ERG Guide 151. 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.

UN 1647 is Methyl bromide and ethylene dibromide mixture, liquid, a highly toxic halogenated liquid mixture assigned to ERG Guide 151. It is dense, heavy-vapor and skin-absorption hazardous, so low areas and runoff need special attention.

Hazard overview: UN 1647 presents toxic vapor, dense-liquid contamination and skin absorption hazards. Heating or fire may produce hydrogen bromide and other toxic/corrosive gases.

Response guidance: For a UN 1647 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 151. Establish incident command, isolate the area, stay upwind, prevent dust or vapor exposure, control runoff and choose entry or cleanup actions based on monitoring, SDS and local SOP.

Firefighter training notes: Training for UN 1647 should emphasize heavy vapor behavior, dense liquid contamination, toxic fumigant exposure, skin absorption and downwind protective actions. Use ERG 151, SDS and incident command.

Regulatory context: Methyl bromide and ethylene dibromide mixture, liquid is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by formulation, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.

Storage & handling: Methyl bromide and ethylene dibromide mixture, liquid should be stored in tightly closed compatible containers in a secure, cool, well-ventilated toxic-material area away from heat, incompatible chemicals and unauthorized access. Secondary containment should account for dense liquid and toxic runoff.

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UN 1647 Quick Details

UN 1647
Product name: Methyl bromide and ethylene dibromide mixture, liquid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill 25-50m all directions; initial evacuation 100m in all directions; if fire or large spill, evacuate 800m downwind

Common Hazards of UN 1647

  • HIGHLY TOXIC halogenated liquid mixture; inhalation, ingestion or skin absorption may be fatal.
  • Vapors are heavier than air and may collect in low, confined or poorly ventilated areas.
  • Liquid is denser than water and may sink, spreading contamination below the surface.
  • Non-flammable under normal conditions, but heating or fire may produce hydrogen bromide and other toxic/corrosive gases.
  • Skin contact and contaminated clothing can continue exposure.
  • Runoff may carry toxic contamination to drains or waterways.
  • Containers may rupture or fail when heated.

Chemical Identity & Physical Properties

Clear to pale yellow liquid with a chloroform-like or sweet odor. Denser than water and will sink.

Also known asMethyl bromide-ethylene dibromide mixtureBromomethane-dibromoethane mixtureMeBr-EDB mixtureMethyl bromide/EDB blend
AppearanceClear to pale yellow liquid with a chloroform-like or sweet odor. Denser than water and will sink.
Flash PointNot applicable (components are non-flammable)
Boiling PointVariable depending on mixture ratio; methyl bromide component boils at 4C (39F), ethylene dibromide at 131C (268F)
Vapor Density3.3-6.5 (heavier than air, vapors will collect in low areas)
Water ReactivityNo significant reaction with water, but slowly hydrolyzes; very low water solubility
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1647

Extinguishing Media

Use water spray to cool containers from a protected position; dry chemical, CO2 or compatible foam may be used for surrounding fire. Avoid direct high-pressure water streams on spills and contain runoff as toxic contamination.

PPE Requirements

⚠️ Level A required for large spills; SCBA mandatory; full chemical-resistant suit; neoprene or butyl rubber gloves; extremely hazardous vapors

Use positive-pressure SCBA and chemical protective clothing selected by hazmat specialists for any vapor or liquid exposure. Level A may be needed for close entry or unknown concentrations because vapors are highly toxic and skin absorption is possible.

Isolation & Evacuation

ERG 151: isolate spill 25-50m all directions; initial evacuation 100m in all directions; if fire or large spill, evacuate 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).

First Actions for a UN 1647 Incident

  • CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
  • Keep unauthorized personnel away.
  • Stay upwind, uphill and/or upstream.
  • Avoid breathing vapors, fumes, dust or mist and avoid all skin or eye contact.
  • Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
  • Avoid creating dust clouds or spreading contaminated liquid, powder, solution, runoff or debris.
  • Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
  • Isolate the spill or leak area and expand the perimeter if dust, vapor, fire involvement or unknown concentration is present.
  • Use ERG Guide 151, shipping papers, SDS, air monitoring and incident command for protective actions.
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📋 Copy & Share Field Card

UN 1647 — Methyl bromide and ethylene dibromide mi
HAZMAT RADIO NOTE — UN 1647 Product: Methyl bromide and ethylene dibromide mixture, liquid Class 6 / Toxic / ERG 151 PPE: Level A required for large spills; SCBA mandatory; full chemical-resistant suit; neoprene or butyl rubber gloves; extremely hazardous vapors ISOLATION: ERG 151: isolate spill 25-50m all directions; initial evacuation 100m in all directions; if fire or large spill, evacuate 800m downwind ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO

Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.

SMS WhatsApp
=== IC HAZMAT BRIEFING === UN 1647 — Methyl bromide and ethylene dibromide mixture, liquid Class: 6 | Placard: Toxic | ERG Guide: 151 Appearance: Clear to pale yellow liquid with a chloroform-like or sweet odor. Denser than water and will sink. Water Reactivity: No significant reaction with water, but slowly hydrolyzes; very low water solubility Extinguishing: Use water spray to cool containers from a protected position; dry chemical, CO2 or compatible foam may be used for surrounding fire. Avoid direct high-pressure water streams on spills and contain runoff as toxic contamination. PPE: Level A required for large spills; SCBA mandatory; full chemical-resistant suit; neoprene or butyl rubber gloves; extremely hazardous vapors Isolation: ERG 151: isolate spill 25-50m all directions; initial evacuation 100m in all directions; if fire or large spill, evacuate 800m downwind — Key Hazards — • HIGHLY TOXIC halogenated liquid mixture; inhalation, ingestion or skin absorption may be fatal. • Vapors are heavier than air and may collect in low, confined or poorly ventilated areas. • Liquid is denser than water and may sink, spreading contamination below the surface. — First Actions — • CALL 911. Then call the emergency response telephone number on the shipping paper, if available. • Keep unauthorized personnel away. • Stay upwind, uphill and/or upstream. • Avoid breathing vapors, fumes, dust or mist and avoid all skin or eye contact. SOURCE: allfirefighter.com/hazmat/un/methyl-bromide-and-ethylene-un-1647 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)
UN1647 Methyl bromide and ethylene dibromide mixture, liquid Cls6 ERG151 | allfirefighter.com/hazmat/un/methyl-bromide-and-ethylene-un-1647SMS / 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/methyl-bromide-and-ethylene-un-1647

Related UN Numbers in Class 6

Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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Frequently Asked Questions about UN 1647

UN 1647 is Methyl bromide and ethylene dibromide mixture, liquid, a hazardous material assigned to ERG Guide 151.

No. The listed components are generally nonflammable, but heating or fire may produce toxic decomposition gases.

ERG Guide 151 applies to UN 1647 for initial isolation, protective actions and first response guidance.

UN 1647 presents toxic vapor, dense-liquid contamination and skin absorption hazards. Heating or fire may produce hydrogen bromide and other toxic/corrosive gases.

Use positive-pressure SCBA and chemical protective clothing selected by hazmat specialists for any vapor or liquid exposure. Level A may be needed for close entry or unknown concentrations because vapors are highly toxic and skin absorption is possible.

The vapors are heavier than air and may collect in basements, trenches, sewers or other low spaces where exposure can become severe.
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.