☣️ UN 2208 • CLASS 5
Calcium hypochlorite mixture, dry, with more than 10% but not more than 39% available chlorine
Placard: Oxidizer. 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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Quick details
UN 2208
Class: 5
Placard type: Oxidizer
ERG: Guide 140 (check current ERG)
Isolation: ERG 140: isolate 25-50m in all directions; for large fires isolate 800m and consider evacuation
Chemical & Response Details
| Also known as | Calcium hypochlorite dry mixCal hypo granularHTHChlorinating powderCalcium oxychloride mixture |
| Appearance | White to light gray granular powder or tablets with a strong chlorine odor. Solid oxidizer at room temperature. |
| Flash Point | Not applicable (non-flammable oxidizer) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water releasing heat and chlorine gas; may ignite combustible materials when wet |
| Extinguishing | Dry chemical, sand, or dry earth only; do not use water or foam on bulk material |
| PPE | ⚠️ Level B minimum with full face SCBA; chemical-resistant suit for large spills; avoid all contact |
| Isolation | ERG 140: isolate 25-50m in all directions; for large fires isolate 800m and consider evacuation |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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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UN 2208 — Calcium hypochlorite mixture, dry, with HAZMAT RADIO NOTE — UN 2208
Product: Calcium hypochlorite mixture, dry, with more than 10% but not more than 39% available chlorine
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum with full face SCBA; chemical-resistant suit for large spills; avoid all contact
ISOLATION: ERG 140: isolate 25-50m in all directions; for large fires isolate 800m and consider evacuation
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 2208 — Calcium hypochlorite mixture, dry, with more than 10% but not more than 39% available chlorine
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White to light gray granular powder or tablets with a strong chlorine odor. Solid oxidizer at room temperature.
Water Reactivity: Reacts with water releasing heat and chlorine gas; may ignite combustible materials when wet
Extinguishing: Dry chemical, sand, or dry earth only; do not use water or foam on bulk material
PPE: Level B minimum with full face SCBA; chemical-resistant suit for large spills; avoid all contact
Isolation: ERG 140: isolate 25-50m in all directions; for large fires isolate 800m and consider evacuation
— 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/2208 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2208 Calcium hypochlorite mixture, dry, with more than 10% but not more than 39% available chlorine Cls5 ERG140 | allfirefighter.com/hazmat/un/2208SMS / 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/2208
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FAQ
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 with full face SCBA; chemical-resistant suit for large spills; avoid all contact
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.