☣️ UN 3515 • CLASS 2
UN 3515 — Adsorbed gas, poisonous, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Placard: Toxic Gas. ERG Guide 173. 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 3515 Quick Details
UN 3515
Product name: Adsorbed gas, poisonous, oxidizing, n.o.s. (Inhalation Hazard Zone A)
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 173 (check current ERG)
Initial isolation: ERG 173: Initial isolation 100m in all directions; protective action distance 800m downwind (day), 2200m downwind (night); evacuate area immediately if leak or fire
Common Hazards of UN 3515
- TOXIC; may be fatal if inhaled or absorbed through skin.
- Vapors may be irritating.
- Contact with gas may cause burns and injury.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some gases may burn or be ignited by heat, sparks or flames.
- May form explosive mixtures with air.
- Oxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low
Chemical Identity & Physical Properties
| Also known as | Adsorbed toxic gas, oxidizing, n.o.s.Poisonous oxidizing gas adsorbedToxic oxidizing gas on solid adsorbentHazard Zone A oxidizing toxic gas |
| Appearance | This is a generic entry for various toxic oxidizing gases adsorbed onto solid porous materials such as activated carbon or molecular sieves. The physical appearance depends on the specific gas and adsorbent used, typically appearing as cylinders or containers filled with granular solid material containing the adsorbed gas. |
| Flash Point | Not applicable (oxidizing gas) |
| Boiling Point | Not applicable (adsorbed gas on solid substrate) |
| Vapor Density | Varies by specific gas; typically heavier than air when released |
| Water Reactivity | May react with water depending on specific gas; oxidizing properties may intensify reactions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3515
Extinguishing Media
Do not use water or foam; use dry chemical or CO2 if appropriate for specific gas; prevent water contact
PPE Requirements
⚠️ Level A required for Zone A materials; fully encapsulating suit with SCBA; chemical-resistant gloves and boots; positive pressure respiratory protection mandatory
Isolation & Evacuation
ERG 173: Initial isolation 100m in all directions; protective action distance 800m downwind (day), 2200m downwind (night); evacuate area immediately if leak or fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 173).
First Actions for a UN 3515 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.
- See Table 1 - Initial Isolation and Protective Action Distances.
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📋 Copy & Share Field Card
UN 3515 — Adsorbed gas, poisonous, oxidizing, n.o.HAZMAT RADIO NOTE — UN 3515
Product: Adsorbed gas, poisonous, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Class 2 / Toxic Gas / ERG 173
PPE: Level A required for Zone A materials; fully encapsulating suit with SCBA; chemical-resistant gloves and boots; positive pressure respiratory protection mandatory
ISOLATION: ERG 173: Initial isolation 100m in all directions; protective action distance 800m downwind (day), 2200m downwind (night); evacuate area immediately if leak or fire
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 3515 — Adsorbed gas, poisonous, oxidizing, n.o.s. (Inhalation Hazard Zone A)
Class: 2 | Placard: Toxic Gas | ERG Guide: 173
Appearance: This is a generic entry for various toxic oxidizing gases adsorbed onto solid porous materials such as activated carbon or molecular sieves. The physical appearance depends on the specific gas and adsorbent used, typically appearing as cylinders or containers filled with granular solid material containing the adsorbed gas.
Water Reactivity: May react with water depending on specific gas; oxidizing properties may intensify reactions
Extinguishing: Do not use water or foam; use dry chemical or CO2 if appropriate for specific gas; prevent water contact
PPE: Level A required for Zone A materials; fully encapsulating suit with SCBA; chemical-resistant gloves and boots; positive pressure respiratory protection mandatory
Isolation: ERG 173: Initial isolation 100m in all directions; protective action distance 800m downwind (day), 2200m downwind (night); evacuate area immediately if leak or fire
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin.
• Vapors may be irritating.
• Contact with gas may cause burns and injury.
— 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/3515 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3515 Adsorbed gas, poisonous, oxidizing, n.o.s. (Inhalation Hazard Zone A) Cls2 ERG173 | allfirefighter.com/hazmat/un/3515SMS / 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/3515
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Frequently Asked Questions about UN 3515
TOXIC; may be fatal if inhaled or absorbed through skin. Vapors may be irritating. Contact with gas may cause burns and injury. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some gases may burn or be ignited by heat, sparks or flames. May form explosive mixtures with air. Oxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low
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 required for Zone A materials; fully encapsulating suit with SCBA; chemical-resistant gloves and boots; positive pressure respiratory protection mandatory
Water reactivity: May react with water depending on specific gas; oxidizing properties may intensify reactions. Recommended extinguishing: Do not use water or foam; use dry chemical or CO2 if appropriate for specific gas; prevent water contact.
ERG Guide 173 recommendation: ERG 173: Initial isolation 100m in all directions; protective action distance 800m downwind (day), 2200m downwind (night); evacuate area immediately if leak or fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 173 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.