☣️ UN 2922 • CLASS 8
Corrosive liquid, poisonous, n.o.s.
Placard: Corrosive. 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 2922
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Initial isolation 50m in all directions; protective action distance 0.1km daytime/0.3km nighttime for small spills, 0.4km daytime/1.1km nighttime for large spills
Chemical & Response Details
| Also known as | Corrosive liquid, toxic, n.o.s.Toxic corrosive liquid, n.o.s.Corrosive poisonous liquid, not otherwise specified |
| Appearance | Variable appearance depending on specific chemical; typically a liquid at room temperature that exhibits both corrosive and toxic properties. May range from colorless to colored, with or without odor depending on the specific substance. |
| Flash Point | Variable depending on specific chemical; consult SDS for actual substance |
| Boiling Point | Variable depending on specific chemical; consult SDS for actual substance |
| Vapor Density | Variable depending on specific chemical; typically heavier than air for most corrosive liquids |
| Water Reactivity | Variable; some corrosive liquids react violently with water generating heat and toxic fumes. Avoid water contact until specific chemical is identified. |
| Extinguishing | Dry chemical, CO2, or other non-water agents preferred until chemical identity confirmed; water may react violently with some corrosives |
| PPE | ⚠️ Level A or B required; full face SCBA mandatory; chemical-resistant suit with butyl or viton gloves; avoid all skin contact due to severe corrosive and toxic hazards |
| Isolation | ERG 154: Initial isolation 50m in all directions; protective action distance 0.1km daytime/0.3km nighttime for small spills, 0.4km daytime/1.1km nighttime for large spills |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
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
- 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 2922 — Corrosive liquid, poisonous, n.o.s. HAZMAT RADIO NOTE — UN 2922
Product: Corrosive liquid, poisonous, n.o.s.
Class 8 / Corrosive / ERG 154
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit with butyl or viton gloves; avoid all skin contact due to severe corrosive and toxic hazards
ISOLATION: ERG 154: Initial isolation 50m in all directions; protective action distance 0.1km daytime/0.3km nighttime for small spills, 0.4km daytime/1.1km nighttime for large spills
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 2922 — Corrosive liquid, poisonous, n.o.s.
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Variable appearance depending on specific chemical; typically a liquid at room temperature that exhibits both corrosive and toxic properties. May range from colorless to colored, with or without odor depending on the specific substance.
Water Reactivity: Variable; some corrosive liquids react violently with water generating heat and toxic fumes. Avoid water contact until specific chemical is identified.
Extinguishing: Dry chemical, CO2, or other non-water agents preferred until chemical identity confirmed; water may react violently with some corrosives
PPE: Level A or B required; full face SCBA mandatory; chemical-resistant suit with butyl or viton gloves; avoid all skin contact due to severe corrosive and toxic hazards
Isolation: ERG 154: Initial isolation 50m in all directions; protective action distance 0.1km daytime/0.3km nighttime for small spills, 0.4km daytime/1.1km nighttime for large spills
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/2922 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2922 Corrosive liquid, poisonous, n.o.s. Cls8 ERG154 | allfirefighter.com/hazmat/un/2922SMS / 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/2922
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 with butyl or viton gloves; avoid all skin contact due to severe corrosive and toxic hazards
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.