☣️ UN 1791 • CLASS 8
Hypochlorite solution
Placard: Corrosive. 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 1791
Class: 8
Placard type: Corrosive
ERG: Guide 154 (check current ERG)
Isolation: ERG 154: Small spill isolate 25m; large spill isolate 50m initial, protect downwind 100m; if tank/rail car involved in fire, isolate 800m all directions
Chemical & Response Details
| Also known as | sodium hypochlorite solutionbleach solutionliquid chlorine bleachCloroxJavelle water |
| CAS Number | 7681-52-9 |
| Appearance | Clear to pale yellow-green liquid with characteristic chlorine-like odor. Aqueous solution of alkaline hypochlorite salts, typically 5-15% concentration for household bleach. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | Approximately 100-110°C (212-230°F), varies with concentration |
| Vapor Density | Not applicable (aqueous solution, heavier than water) |
| Water Reactivity | Miscible with water; may release chlorine gas when mixed with acids or ammonia |
| Extinguishing | Water spray, fog, or mist for cooling containers; do not mix with incompatible materials |
| PPE | ⚠️ Level C minimum with chemical-resistant gloves and apron; SCBA or air-purifying respirator if chlorine gas generation suspected; face shield and eye protection mandatory |
| Isolation | ERG 154: Small spill isolate 25m; large spill isolate 50m initial, protect downwind 100m; if tank/rail car involved in fire, isolate 800m all directions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
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
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 1791 — Hypochlorite solution HAZMAT RADIO NOTE — UN 1791
Product: Hypochlorite solution
Class 8 / Corrosive / ERG 154
PPE: Level C minimum with chemical-resistant gloves and apron; SCBA or air-purifying respirator if chlorine gas generation suspected; face shield and eye protection mandatory
ISOLATION: ERG 154: Small spill isolate 25m; large spill isolate 50m initial, protect downwind 100m; if tank/rail car involved in fire, isolate 800m all directions
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 1791 — Hypochlorite solution
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to pale yellow-green liquid with characteristic chlorine-like odor. Aqueous solution of alkaline hypochlorite salts, typically 5-15% concentration for household bleach.
Water Reactivity: Miscible with water; may release chlorine gas when mixed with acids or ammonia
Extinguishing: Water spray, fog, or mist for cooling containers; do not mix with incompatible materials
PPE: Level C minimum with chemical-resistant gloves and apron; SCBA or air-purifying respirator if chlorine gas generation suspected; face shield and eye protection mandatory
Isolation: ERG 154: Small spill isolate 25m; large spill isolate 50m initial, protect downwind 100m; if tank/rail car involved in fire, isolate 800m all directions
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/1791 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1791 Hypochlorite solution Cls8 ERG154 | ERG 154: Small spill isolate 25m; large spill isolate 50m initial, protect downw | allfirefighter.com/hazmat/un/1791SMS / 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/1791
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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 C minimum with chemical-resistant gloves and apron; SCBA or air-purifying respirator if chlorine gas generation suspected; face shield and eye protection mandatory
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.