☣️ UN 1691 • CLASS 6
Strontium arsenite
Placard: Toxic. 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 1691
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: isolate spill 25m minimum; downwind evacuation 100m during day, 300m at night; larger distances if involved in fire
Chemical & Response Details
| Also known as | Strontium arseniteArsenous acid strontium saltStrontium metaarsenite |
| CAS Number | 14844-70-5 |
| Appearance | White to grayish-white crystalline powder or solid. Odorless. Stable at room temperature. |
| Flash Point | Not applicable (non-combustible inorganic solid) |
| Boiling Point | Not applicable (decomposes at high temperature) |
| Vapor Density | Not applicable (solid with negligible vapor pressure) |
| Water Reactivity | Slightly soluble in water; no violent reaction but releases toxic arsenic compounds |
| Extinguishing | Water spray, dry chemical, CO2 suitable for surrounding fire; material itself non-combustible |
| PPE | ⚠️ Level A recommended for spill response; SCBA required; full chemical-resistant suit to prevent any skin contact |
| Isolation | ERG 151: isolate spill 25m minimum; downwind evacuation 100m during day, 300m at night; larger distances if involved in fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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.
- 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 1691 — Strontium arsenite HAZMAT RADIO NOTE — UN 1691
Product: Strontium arsenite
Class 6 / Toxic / ERG 151
PPE: Level A recommended for spill response; SCBA required; full chemical-resistant suit to prevent any skin contact
ISOLATION: ERG 151: isolate spill 25m minimum; downwind evacuation 100m during day, 300m at night; larger distances if involved in fire
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 1691 — Strontium arsenite
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White to grayish-white crystalline powder or solid. Odorless. Stable at room temperature.
Water Reactivity: Slightly soluble in water; no violent reaction but releases toxic arsenic compounds
Extinguishing: Water spray, dry chemical, CO2 suitable for surrounding fire; material itself non-combustible
PPE: Level A recommended for spill response; SCBA required; full chemical-resistant suit to prevent any skin contact
Isolation: ERG 151: isolate spill 25m minimum; downwind evacuation 100m during day, 300m at night; larger distances if involved in fire
— 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/1691 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1691 Strontium arsenite Cls6 ERG151 | ERG 151: isolate spill 25m minimum; downwind evacuation 100m during day, 300m at | allfirefighter.com/hazmat/un/1691SMS / 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/1691
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FAQ
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 A recommended for spill response; SCBA required; full chemical-resistant suit to prevent any skin contact
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.