☣️ UN 1058 • CLASS 2
UN 1058 — Liquefied gases, nonflammable, charged with nitrogen, carbon dioxide or air
Placard: Non-Flammable Gas. ERG Guide 120. 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.
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UN 1058 Quick Details
UN 1058
Product name: Liquefied gases, nonflammable, charged with nitrogen, carbon dioxide or air
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 120 (check current ERG)
Initial isolation: ERG 120: Initial isolation 100m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions
Common Hazards of UN 1058
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
- Non-flammable gases.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
Chemical Identity & Physical Properties
| Also known as | Compressed gas mixtureInert gas mixtureNon-flammable gas blendPressurized inert gas |
| Appearance | Colorless, odorless liquefied gas mixture under pressure. Typically exists as liquid in cylinders but rapidly vaporizes to gas at atmospheric pressure and room temperature. |
| Flash Point | Not applicable (non-flammable compressed gas) |
| Boiling Point | Variable depending on mixture composition; typically -196°C to -78°C (-321°F to -108°F) for nitrogen/CO2 blends |
| Vapor Density | Initially heavier than air when released (typically 1.0-1.5), though warming gases may approach air density |
| Water Reactivity | No significant reaction with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1058
Extinguishing Media
Not applicable for extinguishing (non-flammable); if container fire, use water spray to cool cylinders
PPE Requirements
⚠️ Level C minimum in well-ventilated areas; Level B with SCBA in confined spaces due to asphyxiation hazard; insulated gloves required for cryogenic contact protection
Isolation & Evacuation
ERG 120: Initial isolation 100m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 120).
First Actions for a UN 1058 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 1058 — Liquefied gases, nonflammable, charged wHAZMAT RADIO NOTE — UN 1058
Product: Liquefied gases, nonflammable, charged with nitrogen, carbon dioxide or air
Class 2 / Non-Flammable Gas / ERG 120
PPE: Level C minimum in well-ventilated areas; Level B with SCBA in confined spaces due to asphyxiation hazard; insulated gloves required for cryogenic contact protection
ISOLATION: ERG 120: Initial isolation 100m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1058 — Liquefied gases, nonflammable, charged with nitrogen, carbon dioxide or air
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 120
Appearance: Colorless, odorless liquefied gas mixture under pressure. Typically exists as liquid in cylinders but rapidly vaporizes to gas at atmospheric pressure and room temperature.
Water Reactivity: No significant reaction with water
Extinguishing: Not applicable for extinguishing (non-flammable); if container fire, use water spray to cool cylinders
PPE: Level C minimum in well-ventilated areas; Level B with SCBA in confined spaces due to asphyxiation hazard; insulated gloves required for cryogenic contact protection
Isolation: ERG 120: Initial isolation 100m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions
— Key Hazards —
• Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
• Vapors from liquefied gas are initially heavier than air and spread along ground.
• Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1058 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1058 Liquefied gases, nonflammable, charged with nitrogen, carbon dioxide or air Cls2 ERG120 | allfirefighter.com/hazmat/un/1058SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1058
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Frequently Asked Questions about UN 1058
Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite. Non-flammable gases. Containers may explode when heated. Ruptured cylinders may rocket.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level C minimum in well-ventilated areas; Level B with SCBA in confined spaces due to asphyxiation hazard; insulated gloves required for cryogenic contact protection
Water reactivity: No significant reaction with water. Recommended extinguishing: Not applicable for extinguishing (non-flammable); if container fire, use water spray to cool cylinders.
ERG Guide 120 recommendation: ERG 120: Initial isolation 100m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation for 800m in all directions
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 120 and your department SOP/SOG for incident-specific protective actions.
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.