UN 1907 — Soda lime, with more than 4% sodium hydroxide
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 1907 is Soda lime, with more than 4% sodium hydroxide, a hazardous material assigned to ERG Guide 154. Responders should verify the exact product with shipping papers, package markings and SDS before close action.
Hazard overview: UN 1907 presents hazards that depend on formulation, packaging and incident conditions. Use ERG, SDS and incident command to set isolation, PPE and control actions.
Response guidance: For a UN 1907 incident, responders should verify the product with shipping papers, package markings, SDS and ERG Guide 154. 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 1907 should emphasize exposure routes, air monitoring, PPE selection, decontamination, runoff containment and ERG/SDS verification. Use ERG 154, SDS and local SOP.
Regulatory context: Soda lime, with more than 4% sodium hydroxide 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: Soda lime, with more than 4% sodium hydroxide should be stored in tightly closed compatible containers in a secure, cool, dry, well-ventilated hazardous-material area according to SDS and local procedures.
UN 1907 Quick Details
Common Hazards of UN 1907
- CORROSIVE material; inhalation, ingestion or skin/eye contact may cause severe injury.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff may be corrosive and may pollute waterways.
- Containers may rupture or fail when heated.
- Specific hazards depend on the exact product, concentration and SDS.
Chemical Identity & Physical Properties
White to grayish-white granular solid or powder. Odorless or slight ammonia-like odor. Hygroscopic material that absorbs moisture and carbon dioxide from air.
| Also known as | Soda limeSodalimeSodium hydroxide-calcium hydroxide mixtureCO2 absorbentBaralyme |
| Appearance | White to grayish-white granular solid or powder. Odorless or slight ammonia-like odor. Hygroscopic material that absorbs moisture and carbon dioxide from air. |
| Flash Point | Not applicable (non-flammable inorganic solid) |
| Boiling Point | Not applicable (decomposes upon heating above 512C/954F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water generating heat; dissolves to form strongly alkaline corrosive solution with pH >12 |
Fireground Response Guidance — UN 1907
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 1907 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 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 154, shipping papers, SDS, air monitoring and incident command for protective actions.
📋 Copy & Share Field Card
UN 1907 — Soda lime, with more than 4% sodium hydrUse 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.