☣️ UN 1073 • CLASS 2
Oxygen, refrigerated liquid (cryogenic liquid)
Placard: Non-Flammable Gas. 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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Quick details
UN 1073
Class: 2
Placard type: Non-Flammable Gas
ERG: Guide 122 (check current ERG)
Isolation: ERG 122: isolate 100m all directions initially; for large spills isolate 800m downwind; avoid ignition sources and combustibles
Chemical & Response Details
| Also known as | LOXLiquid oxygenCryogenic oxygenLO2Oxygen cryogenic liquid |
| CAS Number | 7782-44-7 |
| Appearance | Clear, pale blue cryogenic liquid with no odor. Boils at -183°C (-297°F) and produces colorless oxygen gas vapor. |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | -183C (-297F) |
| Vapor Density | 1.1 (heavier than air) |
| Water Reactivity | No significant reaction with water, but intense cold can cause violent boiling/splashing |
| Extinguishing | Not applicable - use water spray to keep containers cool; do not direct water at liquid oxygen |
| PPE | ⚠️ Level B minimum; SCBA required; cryogenic gloves and face shield for liquid contact; avoid all organic materials near LOX |
| Isolation | ERG 122: isolate 100m all directions initially; for large spills isolate 800m downwind; avoid ignition sources and combustibles |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Substance does not burn but will support combustion.
- Some may react explosively with fuels.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
First actions (field-minded)
- 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 500 meters (1/3 mile).
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UN 1073 — Oxygen, refrigerated liquid (cryogenic l HAZMAT RADIO NOTE — UN 1073
Product: Oxygen, refrigerated liquid (cryogenic liquid)
Class 2 / Non-Flammable Gas / ERG 122
PPE: Level B minimum; SCBA required; cryogenic gloves and face shield for liquid contact; avoid all organic materials near LOX
ISOLATION: ERG 122: isolate 100m all directions initially; for large spills isolate 800m downwind; avoid ignition sources and combustibles
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 1073 — Oxygen, refrigerated liquid (cryogenic liquid)
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 122
Appearance: Clear, pale blue cryogenic liquid with no odor. Boils at -183°C (-297°F) and produces colorless oxygen gas vapor.
Water Reactivity: No significant reaction with water, but intense cold can cause violent boiling/splashing
Extinguishing: Not applicable - use water spray to keep containers cool; do not direct water at liquid oxygen
PPE: Level B minimum; SCBA required; cryogenic gloves and face shield for liquid contact; avoid all organic materials near LOX
Isolation: ERG 122: isolate 100m all directions initially; for large spills isolate 800m downwind; avoid ignition sources and combustibles
— Key Hazards —
• Substance does not burn but will support combustion.
• Some may react explosively with fuels.
• May ignite combustibles (wood, paper, oil, clothing, etc.).
— 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/1073 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1073 Oxygen, refrigerated liquid (cryogenic liquid) Cls2 ERG122 | allfirefighter.com/hazmat/un/1073SMS / 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/1073
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FAQ
Substance does not burn but will support combustion. Some may react explosively with fuels. May ignite combustibles (wood, paper, oil, clothing, etc.). Vapors from liquefied gas are initially heavier than air and spread along ground. Runoff may create fire or explosion hazard. Containers may explode when heated. Ruptured cylinders may rocket. Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
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 B minimum; SCBA required; cryogenic gloves and face shield for liquid contact; avoid all organic materials near LOX
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 122 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.