UN 2922 — Corrosive liquid, poisonous, n.o.s.
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2922 is Corrosive liquid, poisonous, n.o.s., a Class 8 entry for liquids that present both chemical burn and toxic exposure hazards. The exact product must be confirmed before close operations.
Hazard overview: UN 2922 can injure responders by inhalation, ingestion, skin absorption or direct corrosive contact. Because it is n.o.s., hazards such as water reaction, metal corrosion, hydrogen generation and toxic vapor release depend on the actual chemical.
Response guidance: For UN 2922, establish command, isolate the release, keep personnel upwind and prevent runoff from drains. Identify the product from shipping papers, SDS and container markings before selecting neutralization, suppression or transfer tactics.
Firefighter training notes: Train crews to treat UN 2922 as a variable toxic-corrosive liquid. Emphasize product identification, air monitoring, splash protection, decon setup, runoff control and SDS-based PPE selection.
Regulatory context: UN 2922 is regulated as a corrosive material with poisonous properties. Verify the technical name, subsidiary risks, packing group and emergency contact from shipping papers.
Storage & handling: Store according to the specific SDS in corrosion-resistant containers. Keep away from incompatible acids, bases, oxidizers, metals, water-reactive materials and uncontrolled drains.
UN 2922 Quick Details
Common Hazards of UN 2922
- This n.o.s. entry covers variable liquids that are both corrosive and poisonous.
- Inhalation, ingestion, skin contact or eye contact may cause severe injury.
- Liquid contact can cause chemical burns and systemic poisoning depending on the exact product.
- Fire or heating may produce irritating, corrosive or toxic gases.
- Some products may react with metals to generate flammable hydrogen gas.
- Some products may react with water, oxidizers, acids or bases; verify compatibility before control actions.
- Runoff may be toxic, corrosive and environmentally harmful.
- Vapors may collect in low or confined areas depending on the substance.
Chemical Identity & Physical Properties
UN 2922 is normally a liquid, but color, odor, vapor behavior and water reactivity vary widely. Treat unidentified releases as both toxic and corrosive until proven otherwise.
| 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 products may react violently with water or generate heat and toxic fumes |
Fireground Response Guidance — UN 2922
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing suitable for toxic corrosive liquids. Select gloves, boots and suit materials from the SDS because compatibility varies.
Isolation & Evacuation
First Actions for a UN 2922 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream; avoid low areas where vapors may collect.
- Avoid breathing vapors, dust, mist, smoke or fire gases.
- Do not touch damaged containers or spilled material without proper PPE.
- Ventilate confined spaces only if trained, equipped and authorized.
- Use ERG, SDS, shipping papers, labels and monitoring results for final tactical decisions.
📋 Copy & Share Field Card
UN 2922 — Corrosive liquid, poisonous, n.o.s.Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.