☣️ UN 1125 • CLASS 3

UN 1125 — n-Butylamine

Placard: Flammable. ERG Guide 132. 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 1125 is n-Butylamine, a Class 3 flammable amine liquid assigned to ERG Guide 132. It combines flammable vapor behavior with irritating or corrosive amine exposure hazards.

Hazard overview: UN 1125 presents flammable vapor, flashback and corrosive/irritating vapor hazards. Vapors can collect in low areas and ignite, while liquid or vapor contact can injure eyes, skin and respiratory tissue.

Response guidance: For a UN 1125 incident, responders should confirm the product using shipping papers, container markings, SDS and ERG Guide 132. Establish incident command, isolate the area, stay upwind and uphill, remove ignition sources when safe, keep vapors out of sewers and use compatible Class B fire-control agents from a protected position.

Firefighter training notes: Training for UN 1125 should emphasize amine irritation/corrosivity, flammable vapor travel, sewer entry prevention and PPE selection. Common errors include using fire-only PPE for chemical exposure and ignoring alkaline/corrosive runoff. Use ERG 132, SDS and local SOP.

Regulatory context: n-Butylamine 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 product, 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: n-Butylamine should be stored in compatible flammable-liquid containers in a cool, dry, well-ventilated area away from heat, ignition sources, acids, oxidizers and incompatible materials. Use secondary containment and protect containers from corrosion, impact and drain pathways.

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UN 1125 Quick Details

UN 1125
Product name: n-Butylamine
DOT Class: 3
Placard type: Flammable
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions

Common Hazards of UN 1125

  • FLAMMABLE liquid; may be ignited by heat, sparks or flames.
  • Vapors may form explosive mixtures with air and flash back to the source.
  • Vapors are heavier than air and may collect in low or confined areas.
  • Amine vapors or liquid may be irritating or corrosive to eyes, skin and respiratory tissue.
  • Fire may produce irritating, corrosive and/or toxic gases.
  • Runoff to sewer may create fire, explosion or environmental hazards.
  • Containers may rupture or explode when heated.

Chemical Identity & Physical Properties

Colorless to pale yellow liquid with a strong ammonia-like or fishy odor. Highly volatile at room temperature.

Also known as1-butanaminebutylaminemono-n-butylamine1-aminobutanenorvalamine
CAS Number109-73-9
AppearanceColorless to pale yellow liquid with a strong ammonia-like or fishy odor. Highly volatile at room temperature.
Flash Point-12°C (10°F)
Boiling Point78°C (172°F)
Vapor Density2.5 (heavier than air)
Water ReactivitySoluble in water, moderate exothermic reaction with water releasing heat
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1125

Extinguishing Media

Use alcohol-resistant foam, dry chemical or CO2 when compatible; water spray may be used for cooling containers but runoff may be alkaline or contaminated.

PPE Requirements

⚠️ Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive nature

Use positive-pressure SCBA for vapor, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing are important because amine liquids and vapors can irritate or burn tissue.

Isolation & Evacuation

ERG 132: isolate spill 50m all directions; 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 132).

First Actions for a UN 1125 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.
  • Eliminate ignition sources if it is safe to do so.
  • Do not touch or walk through spilled liquid unless properly trained and wearing appropriate protective equipment.
  • Avoid breathing vapors and avoid skin or eye contact with liquid.
  • Ventilate closed spaces before entering, but only if properly trained, equipped and authorized by incident command.
  • Isolate the spill or leak area for at least 50 meters (150 feet) in all directions.
  • For large spills or fire involvement, expand isolation and consider downwind evacuation based on vapor movement, monitoring and incident command.
  • Use ERG Guide 132, shipping papers, SDS and local SOP for protective actions and entry decisions.
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📋 Copy & Share Field Card

UN 1125 — n-Butylamine
HAZMAT RADIO NOTE — UN 1125 Product: n-Butylamine Class 3 / Flammable / ERG 132 PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive nature ISOLATION: ERG 132: isolate spill 50m all directions; 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.

SMS WhatsApp
=== IC HAZMAT BRIEFING === UN 1125 — n-Butylamine Class: 3 | Placard: Flammable | ERG Guide: 132 Appearance: Colorless to pale yellow liquid with a strong ammonia-like or fishy odor. Highly volatile at room temperature. Water Reactivity: Soluble in water, moderate exothermic reaction with water releasing heat Extinguishing: Use alcohol-resistant foam, dry chemical or CO2 when compatible; water spray may be used for cooling containers but runoff may be alkaline or contaminated. PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive nature Isolation: ERG 132: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions — Key Hazards — • FLAMMABLE liquid; may be ignited by heat, sparks or flames. • Vapors may form explosive mixtures with air and flash back to the source. • Vapors are heavier than air and may collect in low or confined areas. — 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. • Eliminate ignition sources if it is safe to do so. SOURCE: allfirefighter.com/hazmat/un/n-butylamine-un-1125 | Always use current ERG + SOP/SOGIC BRIEFING

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

SMS (short)
UN1125 n-Butylamine Cls3 ERG132 | allfirefighter.com/hazmat/un/n-butylamine-un-1125SMS / 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/n-butylamine-un-1125

Related UN Numbers in Class 3

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 1125

UN 1125 is n-Butylamine, a hazardous material assigned to ERG Guide 132.

Yes. It is a flammable liquid and vapors can form explosive mixtures with air.

ERG Guide 132 applies to UN 1125 and should be used for initial isolation, protective actions and first response guidance.

UN 1125 presents flammable vapor, flashback and corrosive/irritating vapor hazards. Vapors can collect in low areas and ignite, while liquid or vapor contact can injure eyes, skin and respiratory tissue.

Use positive-pressure SCBA for vapor, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing are important because amine liquids and vapors can irritate or burn tissue.

Responders should isolate the area, stay upwind and uphill, eliminate ignition sources when safe, prevent sewer entry, verify the product with SDS and follow ERG Guide 132, incident command and local SOP.
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.