☣️ UN 2683 • CLASS 8
Ammonium sulphide, solution
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 2683
Class: 8
Placard type: Corrosive
ERG: Guide 132 (check current ERG)
Isolation: ERG 132: Initial isolation 50m in all directions; protective action distance 0.3 km downwind for small spills, 0.8 km for large spills during daytime
Chemical & Response Details
| Also known as | Ammonium sulfide solutionDiammonium sulfideAmmonium monosulfideAmmonium hydrogen sulfide solution |
| CAS Number | 12135-76-1 |
| Appearance | Yellow to orange liquid with a strong, offensive rotten egg odor (hydrogen sulfide smell). Solution typically contains 40-44% ammonium sulfide in water. |
| Flash Point | Varies by concentration, typically 30-40°C (86-104°F) for commercial solutions |
| Boiling Point | Decomposes before boiling, releases hydrogen sulfide gas above 40°C (104°F) |
| Vapor Density | Greater than 1 (heavier than air due to hydrogen sulfide and ammonia vapors) |
| Water Reactivity | Miscible with water but may release toxic hydrogen sulfide and ammonia vapors upon dilution or heating |
| Extinguishing | Alcohol-resistant foam, dry chemical; water spray for cooling only |
| PPE | ⚠️ Level B minimum with SCBA required; full chemical-resistant suit for spills; protect against corrosive liquid and toxic vapor exposure |
| Isolation | ERG 132: Initial isolation 50m in all directions; protective action distance 0.3 km downwind for small spills, 0.8 km for large spills during daytime |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
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 for at least 50 meters (150 feet) in all directions.
- 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 2683 — Ammonium sulphide, solution HAZMAT RADIO NOTE — UN 2683
Product: Ammonium sulphide, solution
Class 8 / Corrosive / ERG 132
PPE: Level B minimum with SCBA required; full chemical-resistant suit for spills; protect against corrosive liquid and toxic vapor exposure
ISOLATION: ERG 132: Initial isolation 50m in all directions; protective action distance 0.3 km downwind for small spills, 0.8 km for large spills during 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 2683 — Ammonium sulphide, solution
Class: 8 | Placard: Corrosive | ERG Guide: 132
Appearance: Yellow to orange liquid with a strong, offensive rotten egg odor (hydrogen sulfide smell). Solution typically contains 40-44% ammonium sulfide in water.
Water Reactivity: Miscible with water but may release toxic hydrogen sulfide and ammonia vapors upon dilution or heating
Extinguishing: Alcohol-resistant foam, dry chemical; water spray for cooling only
PPE: Level B minimum with SCBA required; full chemical-resistant suit for spills; protect against corrosive liquid and toxic vapor exposure
Isolation: ERG 132: Initial isolation 50m in all directions; protective action distance 0.3 km downwind for small spills, 0.8 km for large spills during daytime
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with 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/2683 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2683 Ammonium sulphide, solution Cls8 ERG132 | allfirefighter.com/hazmat/un/2683SMS / 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/2683
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FAQ
Flammable/combustible material. May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard.
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 SCBA required; full chemical-resistant suit for spills; protect against corrosive liquid and toxic vapor exposure
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 132 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.