☣️ UN 3485 • CLASS 5
UN 3485 — Calcium hypochlorite mixture, dry, corrosive, with more than 39% available chlorine (8.8% available oxygen)
Placard: Oxidizer. ERG Guide 140. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3485 covers dry corrosive calcium hypochlorite mixtures with more than 39% available chlorine.
Hazard overview: The material is an oxidizer and corrosive solid. It can accelerate burning, decompose when heated, and react with contamination or organic material.
Response guidance: Keep away from fuels, organics, acids, and contamination. Isolate spills, avoid dust, and use dry chemical, dry sand, or dry earth where appropriate.
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UN 3485 Quick Details
UN 3485
Product name: Calcium hypochlorite mixture, dry, corrosive, with more than 39% available chlorine (8.8% available oxygen)
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 140 (check current ERG)
Initial isolation: ERG 140: isolate spill 25-50m; if fire, evacuate 800m downwind; keep combustibles away
Common Hazards of UN 3485
- 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.
Chemical Identity & Physical Properties
Calcium hypochlorite mixture, dry, is a white granular solid or powder with a strong chlorine odor, may be in tablet form.
| Also known as | Calcium hypochloriteHTHPerchloronBleaching powderChlorinated lime |
| CAS Number | 7778-54-3 |
| Appearance | White granular solid or powder with a strong chlorine odor. May be in tablet form. Corrosive oxidizing agent. |
| Flash Point | Not applicable (oxidizing solid) |
| Boiling Point | Not applicable (decomposes at 180C/356F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts with water releasing oxygen and heat; may accelerate fire. Avoid large quantities of water. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3485
Extinguishing Media
Dry chemical, dry sand, dry earth; avoid water-based agents on large quantities
PPE Requirements
⚠️ Level B minimum; SCBA required; full face protection; chemical-resistant suit due to corrosive nature
Level B with SCBA, face protection, and chemical-resistant suit is recommended due to oxidizer and corrosive exposure hazards.
Isolation & Evacuation
ERG 140: isolate spill 25-50m; if fire, evacuate 800m downwind; keep combustibles away
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 140).
First Actions for a UN 3485 Incident
- CALL 911. Then call the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate the spill or leak area in all directions using ERG guidance for the material and package size.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 3485 — Calcium hypochlorite mixture, dry, corroHAZMAT RADIO NOTE — UN 3485
Product: Calcium hypochlorite mixture, dry, corrosive, with more than 39% available chlorine (8.8% available oxygen)
Class 5 / Oxidizer / ERG 140
PPE: Level B minimum; SCBA required; full face protection; chemical-resistant suit due to corrosive nature
ISOLATION: ERG 140: isolate spill 25-50m; if fire, evacuate 800m downwind; keep combustibles away
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 3485 — Calcium hypochlorite mixture, dry, corrosive, with more than 39% available chlorine (8.8% available oxygen)
Class: 5 | Placard: Oxidizer | ERG Guide: 140
Appearance: White granular solid or powder with a strong chlorine odor. May be in tablet form. Corrosive oxidizing agent.
Water Reactivity: Reacts with water releasing oxygen and heat; may accelerate fire. Avoid large quantities of water.
Extinguishing: Dry chemical, dry sand, dry earth; avoid water-based agents on large quantities
PPE: Level B minimum; SCBA required; full face protection; chemical-resistant suit due to corrosive nature
Isolation: ERG 140: isolate spill 25-50m; if fire, evacuate 800m downwind; keep combustibles away
— 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 the emergency response number on the shipping paper, if available.
• 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/calcium-hypochlorite-mixture-dry-un-3485 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3485 Calcium hypochlorite mixture, dry, corrosive, with more than 39% available chlorine (8.8% available oxygen) Cls5 ERG140 | allfirefighter.com/hazmat/un/calcium-hypochlorite-mixture-dry-un-3485SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/calcium-hypochlorite-mixture-dry-un-3485
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Frequently Asked Questions about UN 3485
It is not a fuel, but it strongly accelerates burning and may intensify fire.
Water can release heat and oxygen/chlorine-related gases; avoid uncontrolled water use on bulk material.
Level B with SCBA, face protection, and chemical-resistant suit is recommended.
Isolate the spill, keep combustibles away, avoid contamination, and use dry media where appropriate.
UN 3485 is assigned to ERG Guide 140 for initial emergency response guidance.
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.