☣️ UN 1754 • CLASS 8

UN 1754 — Chlorosulphonic acid (with or without sulphur trioxide)

Placard: Corrosive. ERG Guide 137. 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 1754 is Chlorosulphonic acid (with or without sulphur trioxide), a hazardous material assigned to ERG Guide 137. Responders should verify the exact product with shipping papers, package markings and SDS before close action.

Hazard overview: UN 1754 presents corrosive, toxic, flammable or reactive hazards depending on the product and incident conditions. Use ERG, SDS and incident command to set isolation, PPE and control actions.

Response guidance: For a UN 1754 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 137. Establish incident command, isolate the area, stay upwind, prevent incompatible contact, control runoff and choose entry or fire-control actions based on monitoring, SDS and local SOP.

Firefighter training notes: Training for UN 1754 should emphasize toxic/corrosive exposure routes, water or oxidizer incompatibility where applicable, air monitoring, PPE selection, decontamination and runoff containment. Use ERG 137, SDS and local SOP.

Regulatory context: Chlorosulphonic acid (with or without sulphur trioxide) 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 concentration, 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: Chlorosulphonic acid (with or without sulphur trioxide) should be stored in tightly closed compatible containers in a secure, cool, dry, well-ventilated hazardous-material area according to SDS and local procedures.

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UN 1754 Quick Details

UN 1754
Product name: Chlorosulphonic acid (with or without sulphur trioxide)
DOT Class: 8
Placard type: Corrosive
ERG Guide: 137 (check current ERG)
Initial isolation: ERG 137: Isolate spill area 50m in all directions. For large spill, isolate 800m downwind. Evacuate immediate area and stay upwind.

Common Hazards of UN 1754

  • CORROSIVE material; inhalation, ingestion or skin/eye contact may cause severe injury.
  • Fire may produce irritating, corrosive and/or toxic gases.
  • Runoff may be corrosive and may pollute waterways.
  • Containers may rupture or fail when heated.
  • Specific hazards depend on the exact product, concentration and SDS.

Chemical Identity & Physical Properties

Colorless to pale yellow fuming liquid with a pungent, acrid odor. Extremely corrosive and reacts violently with moisture in air, producing dense white fumes of hydrochloric acid and sulfuric acid mist.

Also known aschlorosulfuric acidsulfuric chlorohydrinmonochlorosulfuric acidsulfurochloridic acid
CAS Number7790-94-5
AppearanceColorless to pale yellow fuming liquid with a pungent, acrid odor. Extremely corrosive and reacts violently with moisture in air, producing dense white fumes of hydrochloric acid and sulfuric acid mist.
Flash PointNot applicable (non-flammable liquid)
Boiling Point151-152C (304-306F)
Vapor Density4.0 (heavier than air)
Water ReactivityReacts violently with water, generating intense heat and toxic/corrosive fumes (HCl, SO2, H2SO4). Never apply water directly.
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1754

Extinguishing Media

Use extinguishing agents appropriate for the surrounding fire and SDS. Water spray may cool containers or reduce vapors only when runoff can be controlled as toxic/corrosive contamination.

PPE Requirements

⚠️ Level A required for spill response. Full encapsulating chemical protective suit, SCBA, butyl rubber or Viton gloves. Acid-resistant boots.

Use positive-pressure SCBA for vapor, mist, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing should be selected from SDS to prevent skin and eye contact.

Isolation & Evacuation

ERG 137: Isolate spill area 50m in all directions. For large spill, isolate 800m downwind. Evacuate immediate area and stay upwind.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 137).

First Actions for a UN 1754 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, mist or gas and avoid skin or eye contact.
  • Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
  • 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 vapor, gas, dust, fire involvement, water reaction or unknown concentration is present.
  • Use ERG Guide 137, shipping papers, SDS, air monitoring and incident command for protective actions.
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📋 Copy & Share Field Card

UN 1754 — Chlorosulphonic acid (with or without su
HAZMAT RADIO NOTE — UN 1754 Product: Chlorosulphonic acid (with or without sulphur trioxide) Class 8 / Corrosive / ERG 137 PPE: Level A required for spill response. Full encapsulating chemical protective suit, SCBA, butyl rubber or Viton gloves. Acid-resistant boots. ISOLATION: ERG 137: Isolate spill area 50m in all directions. For large spill, isolate 800m downwind. Evacuate immediate area and stay upwind. 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 1754 — Chlorosulphonic acid (with or without sulphur trioxide) Class: 8 | Placard: Corrosive | ERG Guide: 137 Appearance: Colorless to pale yellow fuming liquid with a pungent, acrid odor. Extremely corrosive and reacts violently with moisture in air, producing dense white fumes of hydrochloric acid and sulfuric acid mist. Water Reactivity: Reacts violently with water, generating intense heat and toxic/corrosive fumes (HCl, SO2, H2SO4). Never apply water directly. Extinguishing: Use extinguishing agents appropriate for the surrounding fire and SDS. Water spray may cool containers or reduce vapors only when runoff can be controlled as toxic/corrosive contamination. PPE: Level A required for spill response. Full encapsulating chemical protective suit, SCBA, butyl rubber or Viton gloves. Acid-resistant boots. Isolation: ERG 137: Isolate spill area 50m in all directions. For large spill, isolate 800m downwind. Evacuate immediate area and stay upwind. — Key Hazards — • CORROSIVE material; inhalation, ingestion or skin/eye contact may cause severe injury. • Fire may produce irritating, corrosive and/or toxic gases. • Runoff may be corrosive and may pollute waterways. — 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, mist or gas and avoid skin or eye contact. SOURCE: allfirefighter.com/hazmat/un/chlorosulphonic-acid-un-1754 | Always use current ERG + SOP/SOGIC BRIEFING

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

SMS (short)
UN1754 Chlorosulphonic acid (with or without sulphur trioxide) Cls8 ERG137 | allfirefighter.com/hazmat/un/chlorosulphonic-acid-un-1754SMS / 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/chlorosulphonic-acid-un-1754

Related UN Numbers in Class 8

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 1754

UN 1754 is Chlorosulphonic acid (with or without sulphur trioxide), a hazardous material assigned to ERG Guide 137.

Flammability depends on the exact material and SDS; verify before action.

ERG Guide 137 applies to UN 1754 for initial isolation, protective actions and first response guidance.

UN 1754 presents corrosive, toxic, flammable or reactive hazards depending on the product and incident conditions. Use ERG, SDS and incident command to set isolation, PPE and control actions.

Use positive-pressure SCBA for vapor, mist, fire or confined-space exposure. Chemical-resistant gloves, eye/face protection and protective clothing should be selected from SDS to prevent skin and eye contact.
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.