☣️ UN 3169 • CLASS 2
UN 3169 — Gas sample, non-pressurized, poisonous, n.o.s., not refrigerated liquid
Placard: Toxic Gas. ERG Guide 123. 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 3169 Quick Details
UN 3169
Product name: Gas sample, non-pressurized, poisonous, n.o.s., not refrigerated liquid
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 123 (check current ERG)
Initial isolation: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; evacuate area and deny entry; increase distances for large spills or fire involvement
Common Hazards of UN 3169
- TOXIC; may be fatal if inhaled or absorbed through skin.
- Vapors may be irritating and/or corrosive.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief
Chemical Identity & Physical Properties
| Also known as | Toxic gas samplePoisonous gas sample NOSNon-pressurized toxic gas sampleLaboratory gas sample |
| Appearance | Variable appearance depending on specific gas; may be colorless to colored gas at room temperature; odor varies by specific substance; non-pressurized sample typically in glass or metal container. |
| Flash Point | Not applicable (gas sample) |
| Boiling Point | Variable depending on specific gas |
| Vapor Density | Variable depending on specific gas; typically heavier than air for most toxic gases |
| Water Reactivity | Variable depending on specific gas; some may react with water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3169
Extinguishing Media
Do not use water; ventilate area; consult specialist for specific gas
PPE Requirements
⚠️ Level A or B required; SCBA mandatory; full chemical protective suit; avoid all contact
Isolation & Evacuation
ERG 123: isolate spill/leak area immediately for at least 100m in all directions; evacuate area and deny entry; increase distances for large spills or fire involvement
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 123).
First Actions for a UN 3169 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.
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 3169 — Gas sample, non-pressurized, poisonous,HAZMAT RADIO NOTE — UN 3169
Product: Gas sample, non-pressurized, poisonous, n.o.s., not refrigerated liquid
Class 2 / Toxic Gas / ERG 123
PPE: Level A or B required; SCBA mandatory; full chemical protective suit; avoid all contact
ISOLATION: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; evacuate area and deny entry; increase distances for large spills or fire involvement
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 3169 — Gas sample, non-pressurized, poisonous, n.o.s., not refrigerated liquid
Class: 2 | Placard: Toxic Gas | ERG Guide: 123
Appearance: Variable appearance depending on specific gas; may be colorless to colored gas at room temperature; odor varies by specific substance; non-pressurized sample typically in glass or metal container.
Water Reactivity: Variable depending on specific gas; some may react with water
Extinguishing: Do not use water; ventilate area; consult specialist for specific gas
PPE: Level A or B required; SCBA mandatory; full chemical protective suit; avoid all contact
Isolation: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; evacuate area and deny entry; increase distances for large spills or fire involvement
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin.
• Vapors may be irritating and/or corrosive.
• Contact with gas or liquefied gas 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/3169 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3169 Gas sample, non-pressurized, poisonous, n.o.s., not refrigerated liquid Cls2 ERG123 | allfirefighter.com/hazmat/un/3169SMS / 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/3169
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Frequently Asked Questions about UN 3169
TOXIC; may be fatal if inhaled or absorbed through skin. Vapors may be irritating and/or corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief
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 A or B required; SCBA mandatory; full chemical protective suit; avoid all contact
Water reactivity: Variable depending on specific gas; some may react with water. Recommended extinguishing: Do not use water; ventilate area; consult specialist for specific gas.
ERG Guide 123 recommendation: ERG 123: isolate spill/leak area immediately for at least 100m in all directions; evacuate area and deny entry; increase distances for large spills or fire involvement
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 123 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.