UN 2837 — Sodium bisulphate, solution
Placard: Corrosive. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2837 is Sodium bisulphate, solution, a corrosive acidic solution assigned to ERG Guide 154. Concentration affects burn severity and heat of dilution.
Hazard overview: CORROSIVE acidic bisulfate solution; splashes or mist can burn eyes, skin and respiratory tissue. Non-flammable aqueous solution, but acids can react with metals to generate hydrogen gas. Dilution or neutralization can release heat and cause splattering.
Response guidance: For UN 2837, isolate the area, avoid skin contact and use SCBA where dust, vapor, mist or fire is present. Contain corrosive/toxic runoff and verify controls with SDS and ERG 154.
Firefighter training notes: Training for UN 2837 should emphasize exposure routes, SCBA use, vapor/dust monitoring, fire behavior, decontamination, runoff containment and SDS verification. Use ERG 154, SDS and local SOP.
Regulatory context: Sodium bisulphate, solution is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Sodium bisulphate, solution should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2837 Quick Details
Common Hazards of UN 2837
- CORROSIVE acidic bisulfate solution; splashes or mist can burn eyes, skin and respiratory tissue.
- Non-flammable aqueous solution, but acids can react with metals to generate hydrogen gas.
- Dilution or neutralization can release heat and cause splattering.
- Heating can release sulfur oxides and acidic fumes.
- Runoff may be acidic, corrosive and harmful to waterways.
- Exact concentration affects corrosivity and heat of dilution.
- Containers may fail when heated or damaged.
Chemical Identity & Physical Properties
Clear to slightly yellow acidic aqueous solution with a characteristic sulfurous odor. Corrosive liquid at room temperature.
| Also known as | Sodium hydrogen sulfate solutionSodium acid sulfate solutionBisulfate of soda solutionNaHSO4 solution |
| CAS Number | 7681-38-1 |
| Appearance | Clear to slightly yellow acidic aqueous solution with a characteristic sulfurous odor. Corrosive liquid at room temperature. |
| Flash Point | Not applicable (aqueous solution) |
| Boiling Point | Approximately 100-110C (212-230F) depending on concentration |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already in aqueous solution; dilution generates heat but no violent reaction |
Fireground Response Guidance — UN 2837
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for vapor, dust, mist, fire or confined-space exposure. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing.
Isolation & Evacuation
First Actions for a UN 2837 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.
- 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 154, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2837 — Sodium bisulphate, solutionUse 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.