☣️ UN 1574 • CLASS 6
UN 1574 — Calcium arsenate and calcium arsenite mixture, solid
Placard: Toxic. ERG Guide 151. 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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UN 1574 Quick Details
UN 1574
Product name: Calcium arsenate and calcium arsenite mixture, solid
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area at least 25m in all directions; if large spill isolate 50m and consider evacuation; for fire isolate 800m in all directions
Common Hazards of UN 1574
- 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 | Calcium arsenateCalcium arseniteArsenious acid calcium saltTricalcium arsenateCalcium meta-arsenite |
| Appearance | White to grayish-white odorless powder or granular solid at room temperature. May appear as a mixed crystalline material. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (decomposes at high temperature) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slightly soluble in water; no violent reaction but may release toxic arsenic compounds in solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1574
Extinguishing Media
Dry chemical, CO2, water spray for cooling; foam generally not required for solid material
PPE Requirements
⚠️ Level A or B minimum; full face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
Isolation & Evacuation
ERG 151: isolate spill area at least 25m in all directions; if large spill isolate 50m and consider evacuation; for fire isolate 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 1574 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 1574 — Calcium arsenate and calcium arsenite miHAZMAT RADIO NOTE — UN 1574
Product: Calcium arsenate and calcium arsenite mixture, solid
Class 6 / Toxic / ERG 151
PPE: Level A or B minimum; full face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
ISOLATION: ERG 151: isolate spill area at least 25m in all directions; if large spill isolate 50m and consider evacuation; for fire isolate 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 1574 — Calcium arsenate and calcium arsenite mixture, solid
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White to grayish-white odorless powder or granular solid at room temperature. May appear as a mixed crystalline material.
Water Reactivity: Slightly soluble in water; no violent reaction but may release toxic arsenic compounds in solution
Extinguishing: Dry chemical, CO2, water spray for cooling; foam generally not required for solid material
PPE: Level A or B minimum; full face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
Isolation: ERG 151: isolate spill area at least 25m in all directions; if large spill isolate 50m and consider evacuation; for fire isolate 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/1574 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1574 Calcium arsenate and calcium arsenite mixture, solid Cls6 ERG151 | allfirefighter.com/hazmat/un/1574SMS / 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/1574
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Frequently Asked Questions about UN 1574
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 or B minimum; full face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
Water reactivity: Slightly soluble in water; no violent reaction but may release toxic arsenic compounds in solution. Recommended extinguishing: Dry chemical, CO2, water spray for cooling; foam generally not required for solid material.
ERG Guide 151 recommendation: ERG 151: isolate spill area at least 25m in all directions; if large spill isolate 50m and consider evacuation; for fire isolate 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.