☣️ UN 2741 • CLASS 5
UN 2741 — Barium hypochlorite, with more than 22% available chlorine
Placard: Oxidizer. ERG Guide 141. 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.
Barium hypochlorite is a toxic oxidizing solid with available chlorine. Keep it away from acids, fuels and organic contamination.
Hazard overview: The major hazards are oxidizer-fed fire, chlorine release with acids and toxic barium exposure from dust or contaminated runoff.
Response guidance: Isolate the area, remove combustibles and keep acids away. Use water spray cautiously for cooling and dust suppression from a distance; contain all runoff.
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UN 2741 Quick Details
UN 2741
Product name: Barium hypochlorite, with more than 22% available chlorine
DOT Class: 5
Placard type: Oxidizer
ERG Guide: 141 (check current ERG)
Initial isolation: ERG 141: isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Common Hazards of UN 2741
- Barium hypochlorite is an oxidizer that can intensify burning.
- Contact with acids can release toxic chlorine gas.
- Contamination with fuels, organics or reducing agents can cause rapid reaction or fire.
- Heat can decompose the material and release chlorine or oxygen-rich fumes.
- Barium compounds add toxicity if dust or solution is inhaled or ingested.
- Containers may rupture when heated.
- Runoff can be toxic, corrosive and environmentally hazardous.
Chemical Identity & Physical Properties
White to grayish-white granular powder or solid with a chlorine-like odor. Oxidizing solid that decomposes in moist air
| Also known as | Barium hypochloriteHypochlorous acid barium saltBarium chlorite hypochlorite |
| CAS Number | 13477-10-6 |
| Appearance | White to grayish-white granular powder or solid with a chlorine-like odor. Oxidizing solid that decomposes in moist air. |
| Flash Point | Not applicable (oxidizing solid, non-flammable but accelerates combustion) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Decomposes slowly in water, releasing oxygen and forming barium hydroxide; avoid large amounts of water |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2741
Extinguishing Media
Dry chemical, sand, or dry earth; do not use water except in large flooding quantities; avoid organic materials
PPE Requirements
⚠️ Level B minimum with full face SCBA; chemical-resistant suit; avoid skin contact due to oxidizer and caustic properties
Use SCBA and chemical-resistant clothing; protect against chlorine gas, oxidizer dust and contaminated runoff.
Isolation & Evacuation
ERG 141: isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 141).
First Actions for a UN 2741 Incident
- Call 911 and the emergency response number shown on the shipping papers.
- Keep unauthorized personnel away and deny entry to the spill or fire area.
- Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
- Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
- Do not touch damaged containers or spilled material without appropriate PPE.
- Ventilate confined spaces only if personnel are trained, equipped and monitored.
- Use the ERG, SDS, shipping papers and air monitoring to set isolation, PPE and tactical decisions.
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📋 Copy & Share Field Card
UN 2741 — Barium hypochlorite, with more than 22%HAZMAT RADIO NOTE — UN 2741
Product: Barium hypochlorite, with more than 22% available chlorine
Class 5 / Oxidizer / ERG 141
PPE: Level B minimum with full face SCBA; chemical-resistant suit; avoid skin contact due to oxidizer and caustic properties
ISOLATION: ERG 141: isolate 100m in all directions; if tank/rail car involved in fire, 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 2741 — Barium hypochlorite, with more than 22% available chlorine
Class: 5 | Placard: Oxidizer | ERG Guide: 141
Appearance: White to grayish-white granular powder or solid with a chlorine-like odor. Oxidizing solid that decomposes in moist air.
Water Reactivity: Decomposes slowly in water, releasing oxygen and forming barium hydroxide; avoid large amounts of water
Extinguishing: Dry chemical, sand, or dry earth; do not use water except in large flooding quantities; avoid organic materials
PPE: Level B minimum with full face SCBA; chemical-resistant suit; avoid skin contact due to oxidizer and caustic properties
Isolation: ERG 141: isolate 100m in all directions; if tank/rail car involved in fire, isolate 800m and consider evacuation
— Key Hazards —
• Barium hypochlorite is an oxidizer that can intensify burning.
• Contact with acids can release toxic chlorine gas.
• Contamination with fuels, organics or reducing agents can cause rapid reaction or fire.
— First Actions —
• Call 911 and the emergency response number shown on the shipping papers.
• Keep unauthorized personnel away and deny entry to the spill or fire area.
• Stay upwind, uphill and upstream; avoid low areas where vapors or runoff may collect.
• Avoid breathing dust, vapor, mist or smoke; prevent skin and eye contact.
SOURCE: allfirefighter.com/hazmat/un/barium-hypochlorite-with-more-un-2741 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN2741 Barium hypochlorite, with more than 22% available chlorine Cls5 ERG141 | allfirefighter.com/hazmat/un/barium-hypochlorite-with-more-un-2741SMS / 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/barium-hypochlorite-with-more-un-2741
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Frequently Asked Questions about UN 2741
UN 2741 is Barium hypochlorite, with more than 22% available chlorine, regulated as a hazardous material for transport and emergency response.
The main concern is a hazardous material behavior plus exposure risk from dust, vapor, liquid or fire products.
Approach from upwind, isolate the area, keep nonessential people out and verify the exact product with shipping papers or SDS.
Water may dissolve and spread oxidizer contamination; prevent runoff from entering drains or waterways.
Use SCBA and chemical-resistant clothing; protect against chlorine gas, oxidizer dust and contaminated runoff.
Fire or acid contact can release chlorine and other toxic oxidizer fumes.
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.