☣️ UN 3318 • CLASS 2
Ammonia solution, with more than 50% ammonia
Placard: Non-Flammable Gas. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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.
Advertisement
Quick details
UN 3318
Class: 2
Placard type: Non-Flammable Gas
ERG: Guide 125 (check current ERG)
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
Chemical & Response Details
| 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 |
| 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 |
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
Advertisement
📋 Copy & Share
UN 3318 — Ammonia solution, with more than 50% amm HAZMAT 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 —
• 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/3318 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3318 Ammonia solution, with more than 50% ammonia Cls2 ERG125 | allfirefighter.com/hazmat/un/3318SMS / 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/3318
Advertisement
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; full face protection, chemical-resistant suit; avoid all contact with liquid and vapors
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.