☣️ UN 1825 • CLASS 8
Sodium monoxide
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 1825
Class: 8
Placard type: Corrosive
ERG: Guide 157 (check current ERG)
Isolation: ERG 157: isolate spill area immediate 25m in all directions. Large spill: initial isolation 100m, protective action distance 300m downwind daytime.
Chemical & Response Details
| Also known as | Disodium oxideSodium oxideCalcined sodaDisodium monoxide |
| CAS Number | 1313-59-3 |
| Appearance | White to gray-white hygroscopic powder or crystalline solid. Odorless. Reacts vigorously with moisture in air. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | 1950C (3542F) sublimes |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water generating heat and forming caustic sodium hydroxide solution. Do not use water directly on material. |
| Extinguishing | Dry chemical, dry sand, or soda ash. Do not use water or foam. |
| PPE | ⚠️ Level B minimum; full face respirator with HEPA filters; chemical-resistant suit, gloves, and boots required. SCBA for confined spaces or large releases. |
| Isolation | ERG 157: isolate spill area immediate 25m in all directions. Large spill: initial isolation 100m, protective action distance 300m downwind daytime. |
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 contact (skin, eyes) with vapors, dusts or substance
- Reaction with water or moist air may release toxic, corrosive or flammable gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Fire will 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
- UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above
- Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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 1825 — Sodium monoxide HAZMAT RADIO NOTE — UN 1825
Product: Sodium monoxide
Class 8 / Corrosive / ERG 157
PPE: Level B minimum; full face respirator with HEPA filters; chemical-resistant suit, gloves, and boots required. SCBA for confined spaces or large releases.
ISOLATION: ERG 157: isolate spill area immediate 25m in all directions. Large spill: initial isolation 100m, protective action distance 300m downwind daytime.
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 1825 — Sodium monoxide
Class: 8 | Placard: Corrosive | ERG Guide: 157
Appearance: White to gray-white hygroscopic powder or crystalline solid. Odorless. Reacts vigorously with moisture in air.
Water Reactivity: Reacts violently with water generating heat and forming caustic sodium hydroxide solution. Do not use water directly on material.
Extinguishing: Dry chemical, dry sand, or soda ash. Do not use water or foam.
PPE: Level B minimum; full face respirator with HEPA filters; chemical-resistant suit, gloves, and boots required. SCBA for confined spaces or large releases.
Isolation: ERG 157: isolate spill area immediate 25m in all directions. Large spill: initial isolation 100m, protective action distance 300m downwind daytime.
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Reaction with water or moist air may release toxic, corrosive or flammable gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the air.
— 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/1825 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1825 Sodium monoxide Cls8 ERG157 | ERG 157: isolate spill area immediate 25m in all directions. Large spill: initia | allfirefighter.com/hazmat/un/1825SMS / 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/1825
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FAQ
TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will 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 UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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; full face respirator with HEPA filters; chemical-resistant suit, gloves, and boots required. SCBA for confined spaces or large releases.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 157 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.