☣️ UN 3098 • CLASS 5
Oxidizing liquid, corrosive, n.o.s.
Placard: Oxidizer. 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 3098
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate spill 50m all directions; if tank/railcar involved in fire isolate 800m and consider evacuation 800m
Chemical & Response Details
| Also known as | Oxidizing liquid, corrosive, not otherwise specifiedCorrosive oxidizer liquidUN3098 |
| Appearance | Variable appearance depending on specific substance; typically a clear to colored liquid with corrosive properties and oxidizing characteristics at room temperature. May have irritating or pungent odor. |
| Flash Point | Not applicable (oxidizer) |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable depending on specific substance |
| Water Reactivity | May react with water generating heat; corrosive solution formed |
| Extinguishing | Dry chemical, CO2, water spray from distance; avoid direct contact with organic materials |
| PPE | ⚠️ Level B minimum with acid-resistant suit; SCBA required; full face protection and chemical-resistant gloves mandatory |
| Isolation | ERG 140: isolate spill 50m all directions; if tank/railcar involved in fire isolate 800m and consider evacuation 800m |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
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.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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UN 3098 — Oxidizing liquid, corrosive, n.o.s. HAZMAT RADIO NOTE — UN 3098
Product: Oxidizing liquid, corrosive, n.o.s.
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with acid-resistant suit; SCBA required; full face protection and chemical-resistant gloves mandatory
ISOLATION: ERG 140: isolate spill 50m all directions; if tank/railcar involved in fire isolate 800m and consider evacuation 800m
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 3098 — Oxidizing liquid, corrosive, n.o.s.
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Variable appearance depending on specific substance; typically a clear to colored liquid with corrosive properties and oxidizing characteristics at room temperature. May have irritating or pungent odor.
Water Reactivity: May react with water generating heat; corrosive solution formed
Extinguishing: Dry chemical, CO2, water spray from distance; avoid direct contact with organic materials
PPE: Level B minimum with acid-resistant suit; SCBA required; full face protection and chemical-resistant gloves mandatory
Isolation: ERG 140: isolate spill 50m all directions; if tank/railcar involved in fire isolate 800m and consider evacuation 800m
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— 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.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3098 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3098 Oxidizing liquid, corrosive, n.o.s. Cls5 ERG140 | allfirefighter.com/hazmat/un/3098SMS / 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/3098
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FAQ
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
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 with acid-resistant suit; SCBA required; full face protection and chemical-resistant gloves mandatory
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 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.