UN 3094 — Corrosive liquid, water-reactive, n.o.s.
Placard: Corrosive. ERG Guide 138. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3094 is Corrosive liquid, water-reactive, n.o.s., a broad corrosive water-reactive liquid entry assigned to ERG Guide 138. Moisture can generate gas, heat or ignition.
Hazard overview: CORROSIVE water-reactive liquid, n.o.s.; contact can severely burn tissue. Water or moist air can release flammable, toxic or corrosive gases and heat. Some products may ignite or react violently when exposed to moisture.
Response guidance: For UN 3094, isolate the area, exclude moisture and use SCBA with chemical protection. Use compatible dry media only until the exact product is confirmed by SDS and ERG 138.
Firefighter training notes: Training for UN 3094 should emphasize water exclusion, gas generation, dry-media choice, SCBA/chemical PPE, decontamination and runoff control. Use ERG 138, SDS and local SOP.
Regulatory context: Corrosive liquid, water-reactive, n.o.s. is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, formulation, temperature-control status and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Corrosive liquid, water-reactive, n.o.s. should be stored dry in compatible corrosion-resistant containers away from water, moisture, acids/bases as incompatible, heat and ignition sources. Keep dry media available.
UN 3094 Quick Details
Common Hazards of UN 3094
- CORROSIVE water-reactive liquid, n.o.s.; contact can severely burn tissue.
- Water or moist air can release flammable, toxic or corrosive gases and heat.
- Some products may ignite or react violently when exposed to moisture.
- Vapors may collect in low or poorly ventilated areas depending on the exact liquid.
- Fire may produce toxic/corrosive gases and pressure hazards.
- Runoff may create fire, explosion, corrosive and toxic contamination hazards.
- Exact product must be verified from SDS and shipping papers before selecting media.
Chemical Identity & Physical Properties
Variable appearance depending on specific substance; typically a liquid at room temperature that reacts with water or moisture. May be colorless to colored with varying odors depending on the specific chemical.
| Also known as | Corrosive liquid water-reactive NOSWater-reactive corrosive liquid not otherwise specifiedClass 8 water-reactive liquid |
| Appearance | Variable appearance depending on specific substance; typically a liquid at room temperature that reacts with water or moisture. May be colorless to colored with varying odors depending on the specific chemical. |
| Flash Point | Variable - depends on specific substance; many produce flammable gases on contact with water |
| Boiling Point | Variable - depends on specific substance in this n.o.s. classification |
| Vapor Density | Variable - typically heavier than air for most corrosive liquids in this category |
| Water Reactivity | Reacts with water producing flammable gases; may ignite spontaneously on contact with water or moist air; some react vigorously or explosively with water |
Fireground Response Guidance — UN 3094
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A or B may be needed for unknown product, heavy vapor, dust, splash or fuming risk.
Isolation & Evacuation
First Actions for a UN 3094 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 breathing vapor, dust, mist, smoke or fumes and avoid skin or eye contact.
- Keep water or moisture contact controlled because gas generation or ignition may occur.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 138, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3094 — Corrosive liquid, water-reactive, 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.