☣️ UN 2626 • CLASS 5
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.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 2626 Quick Details
UN 2626
Product name: Chloric acid, aqueous solution, with not more than 10% chloric acid
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill or leak area immediately for at least 50m in all directions; consider initial evacuation for 100m in all directions if involved in fire
Common Hazards of UN 2626
- These substances will accelerate burning when involved in a fire.
- Some may decompose explosively when heated or involved in a fire.
- May explode from heat or contamination.
- Some will react explosively with hydrocarbons (fuels).
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Containers may explode when heated.
- Runoff may create fire or explosion hazard.
- Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
Chemical Identity & Physical Properties
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2626
Extinguishing Media
Water spray, fog; no foam or CO2 on large fires; avoid organic materials and combustibles
PPE Requirements
⚠️ Level B minimum; SCBA required; acid-resistant suit, gloves, and boots; face shield recommended
Isolation & Evacuation
ERG 140: isolate spill or leak area immediately for at least 50m in all directions; consider initial evacuation for 100m in all directions if involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 2626 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 2626 — Chloric acid, aqueous solution, with notHAZMAT RADIO NOTE — UN 2626
Product: Chloric acid, aqueous solution, with not more than 10% chloric acid
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required; acid-resistant suit, gloves, and boots; face shield recommended
ISOLATION: ERG 140: isolate spill or leak area immediately for at least 50m in all directions; consider initial evacuation for 100m in all directions if involved in fire
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 2626 — Chloric acid, aqueous solution, with not more than 10% chloric acid
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: Colorless to pale yellow aqueous solution with a sharp, acrid odor. Liquid at room temperature.
Water Reactivity: Already an aqueous solution; highly reactive oxidizer that can react violently with organic materials and reducing agents
Extinguishing: Water spray, fog; no foam or CO2 on large fires; avoid organic materials and combustibles
PPE: Level B minimum; SCBA required; acid-resistant suit, gloves, and boots; face shield recommended
Isolation: ERG 140: isolate spill or leak area immediately for at least 50m in all directions; consider initial evacuation for 100m in all directions if involved in fire
— Key Hazards —
• These substances will accelerate burning when involved in a fire.
• Some may decompose explosively when heated or involved in a fire.
• May explode from heat or contamination.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/2626 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2626 Chloric acid, aqueous solution, with not more than 10% chloric acid Cls5 ERG140 | allfirefighter.com/hazmat/un/2626SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/2626
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Frequently Asked Questions about UN 2626
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard. Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum; SCBA required; acid-resistant suit, gloves, and boots; face shield recommended
Water reactivity: Already an aqueous solution; highly reactive oxidizer that can react violently with organic materials and reducing agents. Recommended extinguishing: Water spray, fog; no foam or CO2 on large fires; avoid organic materials and combustibles.
ERG Guide 140 recommendation: ERG 140: isolate spill or leak area immediately for at least 50m in all directions; consider initial evacuation for 100m in all directions if involved in fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 140 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.