UN 2626 — Chloric acid, aqueous solution, with not more than 10% chloric acid
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2626 At a Glance
UN 2626 (Chloric acid, aqueous solution, with not more than 10% chloric acid) is listed as DOT Class 5 Oxidizer and is assigned to ERG Guide 140. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 2626 is Chloric acid, aqueous solution, with not more than 10% chloric acid, an oxidizing corrosive acid solution assigned to ERG Guide 140. Concentration and contamination control are critical.
Hazard overview: OXIDIZING chloric acid solution; can intensify fire involving combustibles. Contact with organic materials, reducing agents, metals or strong acids/bases can cause violent reaction. May release chlorine oxides, chlorine and oxygen-containing gases if heated or decomposed.
Response guidance: For UN 2626, isolate the area, remove combustibles and prevent organic/reducing-agent contamination. Use oxidizer-compatible tactics, cool containers from protection and contain acidic/oxidizing runoff.
Firefighter training notes: Training for UN 2626 should emphasize oxidizer contamination control, acid burns, incompatible organics/reducing agents, decomposition signs, container cooling and runoff containment. Use ERG 140, SDS and local SOP.
Regulatory context: Chloric acid, aqueous solution, with not more than 10% chloric acid 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: Chloric acid, aqueous solution, with not more than 10% chloric acid should be stored in compatible acid/oxidizer-rated containers away from organics, fuels, reducing agents, metals where incompatible, heat and contamination.
UN 2626 Quick Details
Common Hazards of UN 2626
- OXIDIZING chloric acid solution; can intensify fire involving combustibles.
- Contact with organic materials, reducing agents, metals or strong acids/bases can cause violent reaction.
- May release chlorine oxides, chlorine and oxygen-containing gases if heated or decomposed.
- Corrosive solution can burn eyes, skin and respiratory tissue.
- Runoff may be acidic, oxidizing and harmful to waterways.
- Containers may rupture when heated or contaminated.
- Exact concentration must be verified; higher concentrations can be much more reactive.
Chemical Identity & Physical Properties
Colorless to pale yellow aqueous solution with a sharp, acrid odor. Liquid at room temperature.
| Also known as | Chloric acid solutionHydrogen chlorate solutionChlorate acid aqueous |
| CAS Number | 7790-93-4 |
| Appearance | Colorless to pale yellow aqueous solution with a sharp, acrid odor. Liquid at room temperature. |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | Approximately 100C (212F) for dilute solutions |
| Vapor Density | Not applicable (aqueous solution) |
| Water Reactivity | Already an aqueous solution; highly reactive oxidizer that can react violently with organic materials and reducing agents |
Fireground Response Guidance — UN 2626
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A may be needed for heavy vapor, fuming, splash risk or unknown concentrations.
Isolation & Evacuation
First Actions for a UN 2626 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, gas, mist, smoke or fumes and avoid skin or eye contact.
- Keep fuels, organics, reducing agents and combustible contamination away from the oxidizer.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Keep water or moisture contact controlled when it may increase reaction, fuming or gas generation.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 140, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2626 — Chloric acid, aqueous solution, with notUse 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.