☣️ UN 1050 • CLASS 2

UN 1050 — Hydrogen chloride, anhydrous

Placard: Toxic Gas. ERG Guide 125. 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 1050 is Hydrogen chloride, anhydrous, a Class 2 toxic and corrosive gas assigned to ERG Guide 125. It fumes in moist air and forms strongly corrosive acid mist or solution on contact with moisture.

Hazard overview: UN 1050 presents toxic inhalation and corrosive acid-gas hazards. Vapors can injure eyes, skin and respiratory tissue, and moisture contact forms hydrochloric acid mist or solution that can damage equipment, surfaces and waterways.

Response guidance: For a UN 1050 incident, responders should confirm the product using shipping papers, cylinder markings, SDS and ERG Guide 125. Establish incident command, isolate the area, stay upwind, avoid vapor contact, use air monitoring when available and consult ERG Table 1 when applicable.

Firefighter training notes: Training for UN 1050 should emphasize toxic inhalation risk, corrosive vapor exposure, SCBA discipline, Table 1 protective actions and cylinder leak-control limitations. Common errors include relying on odor, entering low areas without monitoring, applying water to a reactive leak and selecting splash PPE without respiratory protection.

Regulatory context: Hydrogen chloride, anhydrous is regulated as a hazardous material for transportation and emergency response purposes. Cylinder, workplace exposure, storage, reporting and environmental requirements may vary by product, quantity and jurisdiction. Responders should verify current requirements through shipping papers, SDS, cylinder markings, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.

Storage & handling: Hydrogen chloride, anhydrous should be stored in compatible containers or cylinders in a cool, dry, well-ventilated area with toxic/corrosive gas controls, leak detection where required and segregation from incompatible materials. Protect containers from heat, corrosion, impact, valve damage and unauthorized access.

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UN 1050 Quick Details

UN 1050
Product name: Hydrogen chloride, anhydrous
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 125 (check current ERG)
Initial isolation: ERG 125: initial isolation 100m all directions; protective action distance 0.6 km daytime or 1.7 km nighttime for large spills

Common Hazards of UN 1050

  • TOXIC and/or CORROSIVE; may be fatal if inhaled.
  • Gas or vapor may severely irritate or burn eyes, skin and respiratory tissue.
  • Contact with liquefied gas may cause frostbite and chemical injury.
  • Fire may produce irritating, corrosive and/or toxic gases.
  • Runoff from fire control or vapor suppression may be corrosive or environmentally hazardous.
  • Vapors may collect in low or confined areas depending on product and release conditions.
  • Containers may rupture or rocket when heated.

Chemical Identity & Physical Properties

Colorless to slightly yellow gas with a pungent, irritating odor. Fumes heavily in moist air forming white corrosive mist.

Also known asHydrochloric acid gasMuriatic acid gasHClAnhydrous hydrochloric acidChlorohydric acid
CAS Number7647-01-0
AppearanceColorless to slightly yellow gas with a pungent, irritating odor. Fumes heavily in moist air forming white corrosive mist.
Flash PointNot applicable (non-flammable gas)
Boiling Point-85C (-121F)
Vapor Density1.3 (heavier than air)
Water ReactivityDissolves readily in water generating significant heat and forming corrosive hydrochloric acid solution
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 1050

Extinguishing Media

Do not apply water directly to a reactive gas leak unless compatible and directed by incident command. Water spray may be used from a protected position for vapor reduction or cooling when appropriate for the specific product.

PPE Requirements

⚠️ Level B minimum with full-face SCBA and chemical-resistant suit; upgrade to Level A if high concentrations or confined space

Positive-pressure SCBA is required for suspected toxic gas exposure. Chemical-protective clothing should be selected using SDS, monitoring results, leak conditions and incident command; Level A may be needed for close entry into unknown or high-concentration toxic/corrosive vapor.

Isolation & Evacuation

ERG 125: initial isolation 100m all directions; protective action distance 0.6 km daytime or 1.7 km nighttime for large spills
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 125).

First Actions for a UN 1050 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.
  • Do not touch damaged cylinders, tanks, valves or released material unless properly trained and equipped.
  • Avoid breathing gas, vapor, mist or fire gases.
  • Many toxic or liquefied gases may spread along the ground and collect in low or confined areas.
  • 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 100 meters (330 feet) in all directions.
  • For highlighted materials, consult ERG Table 1 for Initial Isolation and Protective Action Distances.
  • For non-highlighted materials, increase the precautionary distance downwind based on release size, weather, monitoring and incident command.
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📋 Copy & Share Field Card

UN 1050 — Hydrogen chloride, anhydrous
HAZMAT RADIO NOTE — UN 1050 Product: Hydrogen chloride, anhydrous Class 2 / Toxic Gas / ERG 125 PPE: Level B minimum with full-face SCBA and chemical-resistant suit; upgrade to Level A if high concentrations or confined space ISOLATION: ERG 125: initial isolation 100m all directions; protective action distance 0.6 km daytime or 1.7 km nighttime for large spills 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 1050 — Hydrogen chloride, anhydrous Class: 2 | Placard: Toxic Gas | ERG Guide: 125 Appearance: Colorless to slightly yellow gas with a pungent, irritating odor. Fumes heavily in moist air forming white corrosive mist. Water Reactivity: Dissolves readily in water generating significant heat and forming corrosive hydrochloric acid solution Extinguishing: Do not apply water directly to a reactive gas leak unless compatible and directed by incident command. Water spray may be used from a protected position for vapor reduction or cooling when appropriate for the specific product. PPE: Level B minimum with full-face SCBA and chemical-resistant suit; upgrade to Level A if high concentrations or confined space Isolation: ERG 125: initial isolation 100m all directions; protective action distance 0.6 km daytime or 1.7 km nighttime for large spills — Key Hazards — • TOXIC and/or CORROSIVE; may be fatal if inhaled. • Gas or vapor may severely irritate or burn eyes, skin and respiratory tissue. • Contact with liquefied gas may cause frostbite and chemical injury. — 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. • Do not touch damaged cylinders, tanks, valves or released material unless properly trained and equipped. SOURCE: allfirefighter.com/hazmat/un/hydrogen-chloride-anhydrous-un-1050 | Always use current ERG + SOP/SOGIC BRIEFING

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

SMS (short)
UN1050 Hydrogen chloride, anhydrous Cls2 ERG125 | allfirefighter.com/hazmat/un/hydrogen-chloride-anhydrous-un-1050SMS / 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/hydrogen-chloride-anhydrous-un-1050

Related UN Numbers in Class 2

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 1050

UN 1050 is Hydrogen chloride, anhydrous, a hazardous material assigned to ERG Guide 125.

No, it is not primarily a flammable gas, but oxidizing, reactive, toxic or corrosive behavior can make fire conditions severe.

ERG Guide 125 applies to UN 1050 and should be used for initial isolation, protective actions and first response guidance.

UN 1050 presents toxic inhalation and corrosive acid-gas hazards. Vapors can injure eyes, skin and respiratory tissue, and moisture contact forms hydrochloric acid mist or solution that can damage equipment, surfaces and waterways.

Positive-pressure SCBA is required for suspected toxic gas exposure. Chemical-protective clothing should be selected using SDS, monitoring results, leak conditions and incident command; Level A may be needed for close entry into unknown or high-concentration toxic/corrosive vapor.

Responders should isolate the area, stay upwind, verify the product with shipping papers and SDS, use ERG Guide 125, monitor the atmosphere when possible and follow 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.