UN 1903 — Disinfectant, liquid, corrosive, n.o.s.
Placard: Corrosive. ERG Guide 153. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1903 is Disinfectant, liquid, corrosive, n.o.s., a Class 8 corrosive disinfectant entry assigned to ERG Guide 153. Because it is n.o.s., the specific disinfectant formulation controls toxicity, gas release and flammability.
Hazard overview: UN 1903 presents corrosive liquid, incompatible-mixing, toxic gas and contaminated-runoff hazards. Do not mix with other cleaners, acids, ammonia or oxidizers/reducers unless SDS confirms compatibility.
Response guidance: For a UN 1903 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 153. Establish incident command, isolate the area, stay upwind, prevent incompatible contact, control runoff and choose entry or fire-control actions based on monitoring, SDS and local SOP.
Firefighter training notes: Training for UN 1903 should emphasize exposure routes, air monitoring, PPE selection, decontamination, runoff containment and ERG/SDS verification. Use ERG 153, SDS and local SOP.
Regulatory context: Disinfectant, liquid, corrosive, n.o.s. is regulated as a hazardous material for transportation and emergency response purposes. Transportation, workplace exposure, spill reporting, waste handling, storage and environmental requirements may vary by formulation, concentration, quantity and jurisdiction. Verify current requirements through shipping papers, SDS, facility documents and applicable DOT, OSHA, EPA, NFPA, state or local authority guidance.
Storage & handling: Disinfectant, liquid, corrosive, n.o.s. should be stored in compatible corrosion-resistant containers with secondary containment, away from incompatible chemicals, heat and unauthorized access. Follow SDS for oxidizers, acids, bases, solvents or toxic ingredients in the specific product.
UN 1903 Quick Details
Common Hazards of UN 1903
- CORROSIVE liquid disinfectant, n.o.s.; skin, eye or respiratory contact may cause severe injury.
- Exact hazards depend on formulation, which may be acidic, alkaline, oxidizing, quaternary ammonium, chlorine-based or solvent-containing.
- Mixing with acids, ammonia, oxidizers, reducers or other cleaners can release toxic gases depending on formulation.
- Some products may be combustible or may intensify fire; verify flash point and SDS.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff may be corrosive, toxic and environmentally harmful.
- Containers may rupture or fail when heated.
Chemical Identity & Physical Properties
Variable appearance depending on formulation; typically clear to colored liquid with characteristic chemical odor. May be corrosive alkaline or acidic solution at room temperature.
| Also known as | Liquid corrosive disinfectantCorrosive cleaning solutionCorrosive sanitizer liquidDisinfectant solution NOS |
| Appearance | Variable appearance depending on formulation; typically clear to colored liquid with characteristic chemical odor. May be corrosive alkaline or acidic solution at room temperature. |
| Flash Point | Variable - depends on specific formulation; many corrosive disinfectants are non-flammable aqueous solutions |
| Boiling Point | Variable - typically 100-120C (212-248F) for aqueous solutions |
| Vapor Density | Variable - typically >1 (heavier than air) for most liquid disinfectant formulations |
| Water Reactivity | Generally water-miscible; some formulations may generate heat when diluted; avoid mixing with incompatible chemicals |
Fireground Response Guidance — UN 1903
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, mist, dust, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing selected from SDS for corrosive contact.
Isolation & Evacuation
First Actions for a UN 1903 Incident
- CALL 911. Then call the emergency response telephone number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Avoid breathing vapors, fumes, dust, mist or spray and avoid skin or eye contact.
- Do not mix with other cleaners, acids, ammonia or oxidizers/reducers until the SDS confirms compatibility.
- Do not touch or walk through spilled material unless properly trained and wearing appropriate protective equipment.
- Ventilate closed spaces before entering, but only if properly trained, equipped, monitored and authorized by incident command.
- Isolate the spill or leak area and expand the perimeter if vapor, dust, fire involvement, water reaction or unknown concentration is present.
- Use ERG Guide 153, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1903 — Disinfectant, liquid, corrosive, 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.