☣️ UN 1630 • CLASS 6
Mercury ammonium chloride
Placard: Toxic. 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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Quick details
UN 1630
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
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
Chemical & Response Details
| 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 |
| 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 |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
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.
- 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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UN 1630 — Mercury ammonium chloride HAZMAT 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 —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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
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. Full chemical + response details.
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. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/1630
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FAQ
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.
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 full face respirator; Level A if aerosol/vapor release suspected; SCBA required; mercury-resistant gloves mandatory; prevent all skin contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 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.