☣️ UN 3122 • CLASS 6
Poisonous liquid, oxidizing, n.o.s.
Placard: Toxic. 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 3122
Class: 6
Placard type: Toxic
ERG: Guide 142 (check current ERG)
Isolation: ERG 142: Initial isolation 50m in all directions; Protective Action Distance 0.3km daytime, 0.5km nighttime for small spills; larger spills 0.8km day, 1.6km night
Chemical & Response Details
| Also known as | Toxic liquid, oxidizing, n.o.s.Oxidizing poisonous liquidOxidizing toxic liquid, not otherwise specifiedUN3122 |
| Appearance | Variable appearance depending on specific substance; typically a liquid at room temperature. May be colorless to various colors with odor characteristics dependent on the specific oxidizing toxic chemical. |
| Flash Point | Not applicable (oxidizing agent) |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable depending on specific substance; typically heavier than air |
| Water Reactivity | May react with water producing heat and toxic fumes; reaction severity depends on specific substance |
| Extinguishing | Dry chemical, CO2, water spray from distance; avoid direct water contact; consult specific substance data |
| PPE | ⚠️ Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all contact with liquid and vapors |
| Isolation | ERG 142: Initial isolation 50m in all directions; Protective Action Distance 0.3km daytime, 0.5km nighttime for small spills; larger spills 0.8km day, 1.6km night |
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.
- 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.
- TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury,
- Fire may produce irritating, corrosive and/or toxic gases.
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 for at least 50 meters (150 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 3122 — Poisonous liquid, oxidizing, n.o.s. HAZMAT RADIO NOTE — UN 3122
Product: Poisonous liquid, oxidizing, n.o.s.
Class 6 / Toxic / ERG 142
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all contact with liquid and vapors
ISOLATION: ERG 142: Initial isolation 50m in all directions; Protective Action Distance 0.3km daytime, 0.5km nighttime for small spills; larger spills 0.8km day, 1.6km night
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 3122 — Poisonous liquid, oxidizing, n.o.s.
Class: 6 | Placard: Toxic | ERG Guide: 142
Appearance: Variable appearance depending on specific substance; typically a liquid at room temperature. May be colorless to various colors with odor characteristics dependent on the specific oxidizing toxic chemical.
Water Reactivity: May react with water producing heat and toxic fumes; reaction severity depends on specific substance
Extinguishing: Dry chemical, CO2, water spray from distance; avoid direct water contact; consult specific substance data
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit; avoid all contact with liquid and vapors
Isolation: ERG 142: Initial isolation 50m in all directions; Protective Action Distance 0.3km daytime, 0.5km nighttime for small spills; larger spills 0.8km day, 1.6km night
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• May explode from heat or contamination.
• Some will react explosively with hydrocarbons (fuels).
— 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/3122 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3122 Poisonous liquid, oxidizing, n.o.s. Cls6 ERG142 | allfirefighter.com/hazmat/un/3122SMS / 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/3122
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FAQ
These substances will accelerate burning when 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. TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, Fire may produce irritating, corrosive and/or toxic gases.
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; full face SCBA mandatory; chemical-resistant suit; avoid all contact with liquid and vapors
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 142 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.