☣️ UN 1849 • CLASS 8
UN 1849 — Sodium sulphide, hydrated, with not less than 30% water
Placard: Corrosive. ERG Guide 153. 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 1849 Quick Details
UN 1849
Product name: Sodium sulphide, hydrated, with not less than 30% water
DOT Class: 8
Placard type: Corrosive
ERG Guide: 153 (check current ERG)
Initial isolation: ERG 153: isolate spill 25-50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Common Hazards of UN 1849
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
- 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
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
Chemical Identity & Physical Properties
| Also known as | Sodium sulfide hydrateDisodium sulfide hydrateSodium monosulfide hydratedNa2S·xH2O |
| CAS Number | 1313-84-4 |
| Appearance | Yellow to brick-red crystalline solid or flakes with a rotten egg (hydrogen sulfide) odor. Deliquescent, absorbs moisture from air. |
| Flash Point | Not applicable (inorganic solid) |
| Boiling Point | Not applicable (decomposes upon heating) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Dissolves in water generating heat and producing toxic hydrogen sulfide gas; solution is highly alkaline and corrosive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1849
Extinguishing Media
Dry chemical, soda ash, lime; avoid water due to heat generation and toxic gas release
PPE Requirements
⚠️ Level B minimum with full face SCBA; chemical-resistant suit and gloves required; monitor for H2S gas evolution
Isolation & Evacuation
ERG 153: isolate spill 25-50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 153).
First Actions for a UN 1849 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.
- 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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📋 Copy & Share Field Card
UN 1849 — Sodium sulphide, hydrated, with not lessHAZMAT RADIO NOTE — UN 1849
Product: Sodium sulphide, hydrated, with not less than 30% water
Class 8 / Corrosive / ERG 153
PPE: Level B minimum with full face SCBA; chemical-resistant suit and gloves required; monitor for H2S gas evolution
ISOLATION: ERG 153: isolate spill 25-50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
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 1849 — Sodium sulphide, hydrated, with not less than 30% water
Class: 8 | Placard: Corrosive | ERG Guide: 153
Appearance: Yellow to brick-red crystalline solid or flakes with a rotten egg (hydrogen sulfide) odor. Deliquescent, absorbs moisture from air.
Water Reactivity: Dissolves in water generating heat and producing toxic hydrogen sulfide gas; solution is highly alkaline and corrosive
Extinguishing: Dry chemical, soda ash, lime; avoid water due to heat generation and toxic gas release
PPE: Level B minimum with full face SCBA; chemical-resistant suit and gloves required; monitor for H2S gas evolution
Isolation: ERG 153: isolate spill 25-50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears).
• Contact with molten substance may cause severe burns to skin and eyes.
— 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/1849 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1849 Sodium sulphide, hydrated, with not less than 30% water Cls8 ERG153 | allfirefighter.com/hazmat/un/1849SMS / 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/1849
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Frequently Asked Questions about UN 1849
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Methyl bromoacetate (UN2643) is an eye irritant/lachrymator (causes flow of tears). 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 Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
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 SCBA; chemical-resistant suit and gloves required; monitor for H2S gas evolution
Water reactivity: Dissolves in water generating heat and producing toxic hydrogen sulfide gas; solution is highly alkaline and corrosive. Recommended extinguishing: Dry chemical, soda ash, lime; avoid water due to heat generation and toxic gas release.
ERG Guide 153 recommendation: ERG 153: isolate spill 25-50m all directions; if tank/rail car involved in fire, isolate 800m all directions and consider evacuation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 153 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.