☣️ UN 3318 • CLASS 2
UN 3318 — Ammonia solution, with more than 50% ammonia
Placard: Non-Flammable Gas. ERG Guide 125. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3318 covers ammonia solution with more than 50% ammonia. It can release strong ammonia vapors and presents toxic, corrosive, and pressure-related hazards.
Hazard overview: Vapors are extremely irritating and corrosive and may be fatal at high concentrations. Liquid contact can burn skin and eyes, and dilution or heating can increase vapor release.
Response guidance: Stay upwind, isolate the area, and use water spray to reduce vapors only when directed. Do not direct water into containers, and use SCBA with chemical splash protection for entry.
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UN 3318 Quick Details
UN 3318
Product name: Ammonia solution, with more than 50% ammonia
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 125 (check current ERG)
Initial isolation: ERG 125: isolate 60m (200 ft) in all directions; for large spills isolate 150m (500 ft) initially, evacuate downwind 800m (0.5 miles) if tank/rail car involved in fire
Common Hazards of UN 3318
- 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.
Chemical Identity & Physical Properties
Colorless to pale yellow liquid with a strong, pungent, suffocating odor. Highly concentrated aqueous solution that releases ammonia vapors readily at room temperature.
| Also known as | Aqua ammoniaAmmonium hydroxide concentratedAmmonia water strongAqueous ammonia solution |
| CAS Number | 1336-21-6 |
| Appearance | Colorless to pale yellow liquid with a strong, pungent, suffocating odor. Highly concentrated aqueous solution that releases ammonia vapors readily at room temperature. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | Approximately 24-38C (75-100F) depending on concentration |
| Vapor Density | 0.6 (lighter than air) - ammonia vapors |
| Water Reactivity | Miscible with water; dilution generates heat and releases ammonia vapors |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3318
Extinguishing Media
Water spray to reduce vapors, no foam required; do not direct water into container
PPE Requirements
⚠️ Level B minimum with SCBA; full face protection, chemical-resistant suit; avoid all contact with liquid and vapors
Level B minimum with SCBA; full face protection, chemical-resistant suit; avoid all contact with liquid and vapors
Isolation & Evacuation
ERG 125: isolate 60m (200 ft) in all directions; for large spills isolate 150m (500 ft) initially, evacuate downwind 800m (0.5 miles) if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 125).
First Actions for a UN 3318 Incident
- 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 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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📋 Copy & Share Field Card
UN 3318 — Ammonia solution, with more than 50% ammHAZMAT RADIO NOTE — UN 3318
Product: Ammonia solution, with more than 50% ammonia
Class 2 / Non-Flammable Gas / ERG 125
PPE: Level B minimum with SCBA; full face protection, chemical-resistant suit; avoid all contact with liquid and vapors
ISOLATION: ERG 125: isolate 60m (200 ft) in all directions; for large spills isolate 150m (500 ft) initially, evacuate downwind 800m (0.5 miles) if tank/rail car involved in fire
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 3318 — Ammonia solution, with more than 50% ammonia
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 125
Appearance: Colorless to pale yellow liquid with a strong, pungent, suffocating odor. Highly concentrated aqueous solution that releases ammonia vapors readily at room temperature.
Water Reactivity: Miscible with water; dilution generates heat and releases ammonia vapors
Extinguishing: Water spray to reduce vapors, no foam required; do not direct water into container
PPE: Level B minimum with SCBA; full face protection, chemical-resistant suit; avoid all contact with liquid and vapors
Isolation: ERG 125: isolate 60m (200 ft) in all directions; for large spills isolate 150m (500 ft) initially, evacuate downwind 800m (0.5 miles) if tank/rail car involved in fire
— 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 —
• 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 100 meters (330 feet) in all directions.
SOURCE: allfirefighter.com/hazmat/un/ammonia-solution-with-more-un-3318 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3318 Ammonia solution, with more than 50% ammonia Cls2 ERG125 | allfirefighter.com/hazmat/un/ammonia-solution-with-more-un-3318SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/ammonia-solution-with-more-un-3318
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Frequently Asked Questions about UN 3318
It is not readily flammable, but ammonia vapor may burn under some conditions.
It releases corrosive ammonia vapors that can injure the respiratory tract, skin, and eyes.
Water spray may reduce vapors, but do not direct water into containers.
SCBA, chemical-resistant suit, gloves, eye and face protection are required for release response.
ERG Guide 125 applies for initial response.
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.