☣️ UN 1043 • CLASS 2
Fertilizer, ammoniating solution, with free ammonia
Placard: Non-Flammable Gas. 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 1043
Class: 2
Placard type: Non-Flammable Gas
ERG: Guide 125 (check current ERG)
Isolation: ERG 125: isolate spill 100m all directions; initial evacuation 800m downwind during daytime, 2500m at night or if large spill
Chemical & Response Details
| Also known as | Ammoniating solutionAmmoniated fertilizer solutionAnhydrous ammonia solutionFree ammonia fertilizer solution |
| Appearance | Clear to slightly yellowish liquid with a pungent, suffocating ammonia odor. May release visible white vapor clouds, especially when exposed to moist air. |
| Flash Point | Not applicable (non-flammable compressed gas solution) |
| Boiling Point | Varies with ammonia concentration; ammonia component boils at -33C (-28F) |
| Vapor Density | 0.6 (lighter than air for ammonia vapors) |
| Water Reactivity | Dissolves readily in water, releasing heat and forming corrosive ammonium hydroxide solution |
| Extinguishing | Water spray to absorb vapors, no foam required; avoid direct water streams on leaks |
| PPE | ⚠️ Level B minimum with SCBA required; full chemical-resistant suit, butyl rubber gloves; face shield and eye protection mandatory |
| Isolation | ERG 125: isolate spill 100m all directions; initial evacuation 800m downwind during daytime, 2500m at night or if large spill |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
- Vapors are extremely irritating and corrosive.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Some of these materials may react violently with water.
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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 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 1043 — Fertilizer, ammoniating solution, with f HAZMAT RADIO NOTE — UN 1043
Product: Fertilizer, ammoniating solution, with free ammonia
Class 2 / Non-Flammable Gas / ERG 125
PPE: Level B minimum with SCBA required; full chemical-resistant suit, butyl rubber gloves; face shield and eye protection mandatory
ISOLATION: ERG 125: isolate spill 100m all directions; initial evacuation 800m downwind during daytime, 2500m at night or if large spill
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 1043 — Fertilizer, ammoniating solution, with free ammonia
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 125
Appearance: Clear to slightly yellowish liquid with a pungent, suffocating ammonia odor. May release visible white vapor clouds, especially when exposed to moist air.
Water Reactivity: Dissolves readily in water, releasing heat and forming corrosive ammonium hydroxide solution
Extinguishing: Water spray to absorb vapors, no foam required; avoid direct water streams on leaks
PPE: Level B minimum with SCBA required; full chemical-resistant suit, butyl rubber gloves; face shield and eye protection mandatory
Isolation: ERG 125: isolate spill 100m all directions; initial evacuation 800m downwind during daytime, 2500m at night or if large spill
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
• Vapors are extremely irritating and corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1043 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1043 Fertilizer, ammoniating solution, with free ammonia Cls2 ERG125 | allfirefighter.com/hazmat/un/1043SMS / 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/1043
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FAQ
TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water.
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, butyl rubber gloves; face shield and eye protection mandatory
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 125 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.