☣️ UN 1134 • CLASS 3

UN 1134 — Chlorobenzene

Placard: Flammable. ERG Guide 130. 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 1134 is Chlorobenzene, a Class 3 flammable chlorinated liquid assigned to ERG Guide 130. It combines flammable vapor behavior with chlorinated solvent exposure and toxic fire-product concerns.

Hazard overview: UN 1134 presents flammable vapor, flashback and chlorinated solvent hazards. Fire can produce corrosive or toxic decomposition products, and vapors may collect in low or sewer areas where ignition can cause explosion.

Response guidance: For a UN 1134 incident, responders should confirm the product using shipping papers, container markings, SDS and ERG Guide 130. Establish incident command, isolate the area, stay upwind and uphill, remove ignition sources when safe, keep vapors or runoff out of sewers and use compatible Class B fire-control agents from a protected position.

Firefighter training notes: Training for UN 1134 should emphasize flammable vapor behavior, chlorinated solvent exposure, toxic fire products and runoff control. Common errors include relying only on fire PPE, allowing liquid into drains and entering low areas without monitoring.

Regulatory context: Chlorobenzene 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, 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: Chlorobenzene should be stored in tightly closed compatible containers in a cool, dry, well-ventilated flammable-liquid storage area. Keep away from heat, sparks, open flames, oxidizers and incompatible materials, with bonding/grounding, secondary containment and drain protection where required.

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UN 1134 Quick Details

UN 1134
Product name: Chlorobenzene
DOT Class: 3
Placard type: Flammable
ERG Guide: 130 (check current ERG)
Initial isolation: ERG 130: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m

Common Hazards of UN 1134

  • FLAMMABLE chlorinated liquid; vapors may ignite and form explosive mixtures with air.
  • Vapors are heavier than air and may collect in low, confined or sewer areas.
  • Liquid or vapor may irritate eyes, skin and respiratory tissue.
  • Fire may produce irritating, corrosive and/or toxic gases, including hydrogen chloride or phosgene-like decomposition products depending on conditions.
  • Runoff to sewer may create fire, explosion or environmental hazards.
  • Liquid may be denser than water and may spread below the surface depending on the isomer or mixture.
  • Containers may rupture or explode when heated.

Chemical Identity & Physical Properties

Clear, colorless liquid with a characteristic almond-like odor. Liquid at room temperature with moderate volatility.

Also known asmonochlorobenzenephenyl chloridebenzene chlorideMCB
CAS Number108-90-7
AppearanceClear, colorless liquid with a characteristic almond-like odor. Liquid at room temperature with moderate volatility.
Flash Point29°C (84°F)
Boiling Point132°C (270°F)
Vapor Density3.9 (heavier than air)
Water ReactivityInsoluble in water; no significant reaction with water
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1134

Extinguishing Media

Use alcohol-resistant foam, dry chemical or CO2 when compatible; water spray may be used from a protected position to cool containers and reduce vapors.

PPE Requirements

⚠️ Level B minimum; SCBA and chemical-resistant suit required in vapor areas

Use positive-pressure SCBA for fire, vapor or confined-space exposure. Chemical-resistant gloves, splash protection and protective clothing should be selected using SDS because chlorinated solvent liquids and fire products can be harmful.

Isolation & Evacuation

ERG 130: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 130).

First Actions for a UN 1134 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, fire involvement or strong vapor movement, expand isolation and consider downwind evacuation based on monitoring and incident command.
  • Use ERG Guide 130, shipping papers, SDS and local SOP for protective actions and entry decisions.
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📋 Copy & Share Field Card

UN 1134 — Chlorobenzene
HAZMAT RADIO NOTE — UN 1134 Product: Chlorobenzene Class 3 / Flammable / ERG 130 PPE: Level B minimum; SCBA and chemical-resistant suit required in vapor areas ISOLATION: ERG 130: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m 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 1134 — Chlorobenzene Class: 3 | Placard: Flammable | ERG Guide: 130 Appearance: Clear, colorless liquid with a characteristic almond-like odor. Liquid at room temperature with moderate volatility. Water Reactivity: Insoluble in water; no significant reaction with water Extinguishing: Use alcohol-resistant foam, dry chemical or CO2 when compatible; water spray may be used from a protected position to cool containers and reduce vapors. PPE: Level B minimum; SCBA and chemical-resistant suit required in vapor areas Isolation: ERG 130: Small spill isolate 50m all directions; large spill isolate 150m, downwind evacuation 300m — Key Hazards — • FLAMMABLE chlorinated liquid; vapors may ignite and form explosive mixtures with air. • Vapors are heavier than air and may collect in low, confined or sewer areas. • Liquid or vapor may irritate eyes, skin and respiratory tissue. — 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/chlorobenzene-un-1134 | Always use current ERG + SOP/SOGIC BRIEFING

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

SMS (short)
UN1134 Chlorobenzene Cls3 ERG130 | allfirefighter.com/hazmat/un/chlorobenzene-un-1134SMS / 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/chlorobenzene-un-1134

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 1134

UN 1134 is Chlorobenzene, a hazardous material assigned to ERG Guide 130.

Yes. It is flammable and vapors may form explosive mixtures with air.

ERG Guide 130 applies to UN 1134 and should be used for initial isolation, protective actions and first response guidance.

UN 1134 presents flammable vapor, flashback and chlorinated solvent hazards. Fire can produce corrosive or toxic decomposition products, and vapors may collect in low or sewer areas where ignition can cause explosion.

Use positive-pressure SCBA for fire, vapor or confined-space exposure. Chemical-resistant gloves, splash protection and protective clothing should be selected using SDS because chlorinated solvent liquids and fire products can be harmful.

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 130, 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.