☣️ UN 2672 • CLASS 8
UN 2672 — Ammonium hydroxide, with more than 10% but not more than 35% ammonia
Placard: Corrosive. ERG Guide 154. 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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UN 2672 Quick Details
UN 2672
Product name: Ammonium hydroxide, with more than 10% but not more than 35% ammonia
DOT Class: 8
Placard type: Corrosive
ERG Guide: 154 (check current ERG)
Initial isolation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate 500m downwind
Common Hazards of UN 2672
- TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
- Contact with molten substance may cause severe burns to skin and eyes.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.).
- Corrosives in contact with metals may evolve flammable hydrogen gas.
Chemical Identity & Physical Properties
| Also known as | Aqueous ammoniaAmmonia solutionAmmonia waterHousehold ammoniaAmmonium hydroxide solution |
| CAS Number | 1336-21-6 |
| Appearance | Clear to slightly yellow liquid with a pungent, suffocating odor of ammonia. Exists as aqueous solution at room temperature. |
| Flash Point | Not applicable (non-flammable aqueous solution) |
| Boiling Point | Approximately 38C (100F) for 28% solution, varies with concentration |
| Vapor Density | 0.6 (lighter than air, ammonia vapor) |
| Water Reactivity | Miscible with water; dilution reduces hazard but generates heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2672
Extinguishing Media
Water spray to reduce vapors; alcohol-resistant foam if needed for fire exposure
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield with safety goggles
Isolation & Evacuation
ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate 500m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 154).
First Actions for a UN 2672 Incident
- 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 in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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 2672 — Ammonium hydroxide, with more than 10% bHAZMAT RADIO NOTE — UN 2672
Product: Ammonium hydroxide, with more than 10% but not more than 35% ammonia
Class 8 / Corrosive / ERG 154
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield with safety goggles
ISOLATION: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate 500m downwind
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 2672 — Ammonium hydroxide, with more than 10% but not more than 35% ammonia
Class: 8 | Placard: Corrosive | ERG Guide: 154
Appearance: Clear to slightly yellow liquid with a pungent, suffocating odor of ammonia. Exists as aqueous solution at room temperature.
Water Reactivity: Miscible with water; dilution reduces hazard but generates heat
Extinguishing: Water spray to reduce vapors; alcohol-resistant foam if needed for fire exposure
PPE: Level B minimum; SCBA required; chemical-resistant suit, gloves, and boots; face shield with safety goggles
Isolation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate 500m downwind
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury
• Contact with molten substance may cause severe burns to skin and eyes.
• Avoid any skin contact.
— 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/2672 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2672 Ammonium hydroxide, with more than 10% but not more than 35% ammonia Cls8 ERG154 | allfirefighter.com/hazmat/un/2672SMS / 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/2672
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Frequently Asked Questions about UN 2672
TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Corrosives in contact with metals may evolve flammable hydrogen gas.
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; SCBA required; chemical-resistant suit, gloves, and boots; face shield with safety goggles
Water reactivity: Miscible with water; dilution reduces hazard but generates heat. Recommended extinguishing: Water spray to reduce vapors; alcohol-resistant foam if needed for fire exposure.
ERG Guide 154 recommendation: ERG 154: isolate spill 25-50m all directions; for large spill isolate 100m and evacuate 500m downwind
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 154 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.