☣️ UN 1002 • CLASS 2
UN 1002 — Air, compressed
Placard: Non-Flammable Gas. ERG Guide 122. 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 1002 Quick Details
UN 1002
Product name: Air, compressed
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 122 (check current ERG)
Initial isolation: ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation needed for small leaks
Common Hazards of UN 1002
- 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.
Chemical Identity & Physical Properties
| Also known as | Compressed airAirAtmospheric air compressed |
| CAS Number | 132259-10-0 |
| Appearance | Colorless, odorless gas compressed in cylinders. Consists primarily of nitrogen (78%) and oxygen (21%) at ambient temperature. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | Not applicable (mixture of gases) |
| Vapor Density | 1.0 (same as air) |
| Water Reactivity | No reaction with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1002
Extinguishing Media
Not applicable for extinguishing; use water spray to cool cylinders in fire
PPE Requirements
⚠️ Level D for normal operations; SCBA and protective clothing if cylinders are involved in fire or leak in confined space
Isolation & Evacuation
ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation needed for small leaks
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 122).
First Actions for a UN 1002 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 500 meters (1/3 mile).
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📋 Copy & Share Field Card
UN 1002 — Air, compressedHAZMAT RADIO NOTE — UN 1002
Product: Air, compressed
Class 2 / Non-Flammable Gas / ERG 122
PPE: Level D for normal operations; SCBA and protective clothing if cylinders are involved in fire or leak in confined space
ISOLATION: ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation needed for small leaks
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 1002 — Air, compressed
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 122
Appearance: Colorless, odorless gas compressed in cylinders. Consists primarily of nitrogen (78%) and oxygen (21%) at ambient temperature.
Water Reactivity: No reaction with water
Extinguishing: Not applicable for extinguishing; use water spray to cool cylinders in fire
PPE: Level D for normal operations; SCBA and protective clothing if cylinders are involved in fire or leak in confined space
Isolation: ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation needed for small leaks
— 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/1002 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1002 Air, compressed Cls2 ERG122 | ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation | allfirefighter.com/hazmat/un/1002SMS / 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/1002
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Frequently Asked Questions about UN 1002
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 D for normal operations; SCBA and protective clothing if cylinders are involved in fire or leak in confined space
Water reactivity: No reaction with water. Recommended extinguishing: Not applicable for extinguishing; use water spray to cool cylinders in fire.
ERG Guide 122 recommendation: ERG 122: isolate 100m in all directions if cylinder rupture risk; no evacuation needed for small leaks
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.