☣️ UN 1630 • CLASS 6
UN 1630 — Mercury ammonium chloride
Placard: Toxic. ERG Guide 151. 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.
Mercury ammonium chloride is a highly toxic substance that can be fatal if inhaled, ingested or absorbed through skin. Avoid any skin contact.
Hazard overview: Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
Response guidance: Use dry chemical, CO2, or sand. Sparingly soluble in water; no violent reaction but may release toxic mercury compounds.
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UN 1630 Quick Details
UN 1630
Product name: Mercury ammonium chloride
DOT Class: 6
Placard type: Toxic
ERG Guide: 151 (check current ERG)
Initial isolation: ERG 151: isolate spill area immediate 25m all directions; evacuate 50m in all directions; if fire or major spill, isolate 800m and consider evacuation 1600m downwind
Common Hazards of UN 1630
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- 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
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
White or yellowish-white, odorless, heavy powder or crystalline solid at room temperature. Stable under normal conditions but decomposes upon heating.
| Also known as | Ammoniated mercury chlorideMercuric ammonium chlorideMercury ammonium chlorideAmmoniated mercuryWhite precipitate |
| CAS Number | 10124-48-8 |
| Appearance | White or yellowish-white, odorless, heavy powder or crystalline solid at room temperature. Stable under normal conditions but decomposes upon heating. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid, but mercury vapors may be released upon decomposition) |
| Water Reactivity | Sparingly soluble in water; no violent reaction but may release toxic mercury compounds |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1630
Extinguishing Media
Dry chemical, CO2, or sand appropriate for surrounding fire; avoid generating dust
PPE Requirements
⚠️ Level B minimum with full face respirator; Level A if aerosol/vapor release suspected; SCBA required; mercury-resistant gloves mandatory; prevent all skin contact
Level B minimum with full face respirator; Level A if aerosol/vapor release suspected; SCBA required; mercury-resistant gloves mandatory; prevent all skin contact
Isolation & Evacuation
ERG 151: isolate spill area immediate 25m all directions; evacuate 50m in all directions; if fire or major spill, isolate 800m and consider evacuation 1600m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 151).
First Actions for a UN 1630 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- 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 1630 — Mercury ammonium chlorideHAZMAT RADIO NOTE — UN 1630
Product: Mercury ammonium chloride
Class 6 / Toxic / ERG 151
PPE: Level B minimum with full face respirator; Level A if aerosol/vapor release suspected; SCBA required; mercury-resistant gloves mandatory; prevent all skin contact
ISOLATION: ERG 151: isolate spill area immediate 25m all directions; evacuate 50m in all directions; if fire or major spill, isolate 800m and consider evacuation 1600m 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 1630 — Mercury ammonium chloride
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White or yellowish-white, odorless, heavy powder or crystalline solid at room temperature. Stable under normal conditions but decomposes upon heating.
Water Reactivity: Sparingly soluble in water; no violent reaction but may release toxic mercury compounds
Extinguishing: Dry chemical, CO2, or sand appropriate for surrounding fire; avoid generating dust
PPE: Level B minimum with full face respirator; Level A if aerosol/vapor release suspected; SCBA required; mercury-resistant gloves mandatory; prevent all skin contact
Isolation: ERG 151: isolate spill area immediate 25m all directions; evacuate 50m in all directions; if fire or major spill, isolate 800m and consider evacuation 1600m downwind
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— First Actions —
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• 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.
SOURCE: allfirefighter.com/hazmat/un/1630 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1630 Mercury ammonium chloride Cls6 ERG151 | allfirefighter.com/hazmat/un/1630SMS / 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/mercury-ammonium-chloride-un-1630
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Frequently Asked Questions about UN 1630
Yes
May be fatal if inhaled, ingested or absorbed through skin
Dry chemical, CO2, or sand appropriate for surrounding fire; avoid generating dust
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.