☣️ UN 0222 • CLASS 1

UN 0222 — Ammonium nitrate, with more than 0.2% combustible

Placard: Explosive 1.1D. ERG Guide 112. 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.

UN 0222 refers to ammonium nitrate containing more than 0.2% combustible substances, classified as a Class 1 explosive with an Explosive 1.1D placard. This material presents a catastrophic mass explosion risk, meaning the entire load can detonate simultaneously under heat, shock, or friction.

Hazard overview: UN 0222 is capable of a mass detonation that produces severe blast overpressure and high-velocity fragmentation across a wide area. Its sensitivity to heat, shock, and friction makes it exceptionally dangerous in fire conditions or during mechanical handling incidents.

Response guidance: Emergency responders must isolate a minimum of 500 meters (1,600 feet) in all directions and evacuate at least 1 mile downwind when UN 0222 is involved in a fire. For large quantities, mass evacuation should be considered, and personnel must never approach burning ammonium nitrate under any circumstances.

UN 0222 Quick Details

UN 0222

Product name: Ammonium nitrate, with more than 0.2% combustible

DOT Class: 1

Placard type: Explosive 1.1D

ERG Guide: 112 (check current ERG)

Initial isolation: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) downwind if fire involves explosives. Consider mass evacuation for large quantities involved in fire.

Common Hazards of UN 0222

Mass explosion hazard — entire load may detonate simultaneously.
Severe blast overpressure and fragmentation.
Sensitive to heat, shock, and friction.
Secondary fire and debris hazard.

Chemical Identity & Physical Properties

UN 0222 appears as a white to grayish-white crystalline solid or granular material that is odorless or carries a faint ammonia odor and is hygroscopic, meaning it readily absorbs moisture from the surrounding air.

Also known as	Ammonium nitrate fertilizerNitric acid ammonium saltANNorway saltpeterAmmonium saltpeter
CAS Number	6484-52-2
Appearance	White to grayish-white crystalline solid or granular material. Odorless or slight ammonia odor. Hygroscopic (absorbs moisture from air).
Flash Point	Not applicable (oxidizing solid)
Boiling Point	210C (410F) - decomposes before boiling
Vapor Density	Not applicable (solid)
Water Reactivity	Soluble in water; dissolves with slight cooling effect. No violent reaction but creates oxidizing solution.

Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 0222

Extinguishing Media

Do not use water or foam on mass fire. If fire must be fought, use flooding quantities of water from distance or unmanned hose holders.

PPE Requirements

⚠️ Level A minimum for fire conditions; SCBA with full structural firefighting protective clothing. Blast-resistant barriers recommended. Do not approach burning material.

Level A protection with SCBA and full structural firefighting protective clothing is the minimum requirement for fire conditions involving UN 0222, and blast-resistant barriers must be used whenever approach is unavoidable.

Isolation & Evacuation

ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) downwind if fire involves explosives. Consider mass evacuation for large quantities involved in fire.

Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).

First Actions for a UN 0222 Incident

CALL 911. Then call emergency response telephone number on shipping paper.
Establish large isolation zone — minimum 500 meters in all directions.
Stage upwind, uphill; limit personnel to essential responders only.
Request Hazmat + law enforcement + additional resources immediately.
Do not fight fire — evacuate and isolate; let burn if no life safety risk.
Protect exposures only if safe and directed by command.
Consult current ERG Guide 112 and follow SOP/SOG.

📋 Copy & Share Field Card

UN 0222 — Ammonium nitrate, with more than 0.2% co

HAZMAT RADIO NOTE — UN 0222 Product: Ammonium nitrate, with more than 0.2% combustible Class 1 / Explosive 1.1D / ERG 112 PPE: Level A minimum for fire conditions; SCBA with full structural firefighting protective clothing. Blast-resistant barriers recommended. Do not approach burning material. ISOLATION: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) downwind if fire involves explosives. Consider mass evacuation for large quantities 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.

SMS WhatsApp

=== IC HAZMAT BRIEFING === UN 0222 — Ammonium nitrate, with more than 0.2% combustible Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112 Appearance: White to grayish-white crystalline solid or granular material. Odorless or slight ammonia odor. Hygroscopic (absorbs moisture from air). Water Reactivity: Soluble in water; dissolves with slight cooling effect. No violent reaction but creates oxidizing solution. Extinguishing: Do not use water or foam on mass fire. If fire must be fought, use flooding quantities of water from distance or unmanned hose holders. PPE: Level A minimum for fire conditions; SCBA with full structural firefighting protective clothing. Blast-resistant barriers recommended. Do not approach burning material. Isolation: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) downwind if fire involves explosives. Consider mass evacuation for large quantities involved in fire. — Key Hazards — • Mass explosion hazard — entire load may detonate simultaneously. • Severe blast overpressure and fragmentation. • Sensitive to heat, shock, and friction. — First Actions — • CALL 911. Then call emergency response telephone number on shipping paper. • Establish large isolation zone — minimum 500 meters in all directions. • Stage upwind, uphill; limit personnel to essential responders only. • Request Hazmat + law enforcement + additional resources immediately. SOURCE: allfirefighter.com/hazmat/un/ammonium-nitrate-with-more-un-0222 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)

UN0222 Ammonium nitrate, with more than 0.2% combustible Cls1 ERG112 | allfirefighter.com/hazmat/un/ammonium-nitrate-with-more-un-0222SMS / 160 CHAR

Use for: Quick text to command or incoming units. Fits in a single SMS.

Open in Messages WhatsApp

⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/ammonium-nitrate-with-more-un-0222

Related UN Numbers in Class 1

Open Class Guide →Hazmat Hub →

UN 0004 UN 0012 UN 0027 UN 0028 UN 0030 UN 0033 UN 0042 UN 0043 UN 0048 UN 0055 UN 0056 UN 0058

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Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.

Frequently Asked Questions about UN 0222

UN 0222 is not flammable in the conventional sense but is a powerful oxidizer classified as a Class 1 explosive that can detonate en masse when exposed to heat, shock, or friction.

Responders must wear at minimum Level A protection with SCBA and full structural firefighting gear, and blast-resistant barriers are strongly recommended when operating near UN 0222 in fire conditions.

ERG Guide 112 specifies isolating at least 500 meters in all directions and evacuating a minimum of 1 mile downwind when UN 0222 ammonium nitrate is involved in a fire.

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.