☣️ UN 2659 • CLASS 6
UN 2659 — Sodium chloroacetate
Placard: Toxic. ERG Guide 151. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 2659 Quick Details
UN 2659
Product name: Sodium chloroacetate
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fire, isolate 800m and consider evacuation for 800m in all directions.
Common Hazards of UN 2659
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
| Also known as | Monochloroacetic acid sodium saltChloroacetic acid sodium saltSodium monochloroacetateMCA sodium salt |
| CAS Number | 3926-62-3 |
| Appearance | White to tan crystalline powder or granular solid. Hygroscopic with slight acetic odor. Solid at room temperature. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Soluble in water, forms acidic solution. No violent reaction but releases heat on dissolution. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2659
Extinguishing Media
Water spray, dry chemical, CO2. Avoid high-pressure water streams that may spread contamination.
PPE Requirements
⚠️ Level B minimum with full face respirator. Chemical-resistant gloves and suit mandatory. SCBA required in enclosed spaces or high concentrations.
Isolation & Evacuation
ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fire, isolate 800m and consider evacuation for 800m in all directions.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 2659 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.
- 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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📋 Copy & Share Field Card
UN 2659 — Sodium chloroacetateHAZMAT RADIO NOTE — UN 2659
Product: Sodium chloroacetate
Class 6 / Toxic / ERG 151
PPE: Level B minimum with full face respirator. Chemical-resistant gloves and suit mandatory. SCBA required in enclosed spaces or high concentrations.
ISOLATION: ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fire, isolate 800m and consider evacuation for 800m in 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 2659 — Sodium chloroacetate
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White to tan crystalline powder or granular solid. Hygroscopic with slight acetic odor. Solid at room temperature.
Water Reactivity: Soluble in water, forms acidic solution. No violent reaction but releases heat on dissolution.
Extinguishing: Water spray, dry chemical, CO2. Avoid high-pressure water streams that may spread contamination.
PPE: Level B minimum with full face respirator. Chemical-resistant gloves and suit mandatory. SCBA required in enclosed spaces or high concentrations.
Isolation: ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fire, isolate 800m and consider evacuation for 800m in all directions.
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/2659 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2659 Sodium chloroacetate Cls6 ERG151 | ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fi | allfirefighter.com/hazmat/un/2659SMS / 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/2659
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Frequently Asked Questions about UN 2659
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. 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 Containers may explode when heated. Runoff may pollute waterways.
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 respirator. Chemical-resistant gloves and suit mandatory. SCBA required in enclosed spaces or high concentrations.
Water reactivity: Soluble in water, forms acidic solution. No violent reaction but releases heat on dissolution.. Recommended extinguishing: Water spray, dry chemical, CO2. Avoid high-pressure water streams that may spread contamination..
ERG Guide 151 recommendation: ERG 151: Initially isolate 50m in all directions. If tank/railcar involved in fire, isolate 800m and consider evacuation for 800m in all directions.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.