☣️ 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.

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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.

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 asAmmoniated mercury chlorideMercuric ammonium chlorideMercury ammonium chlorideAmmoniated mercuryWhite precipitate
CAS Number10124-48-8
AppearanceWhite or yellowish-white, odorless, heavy powder or crystalline solid at room temperature. Stable under normal conditions but decomposes upon heating.
Flash PointNot applicable (non-flammable solid)
Boiling PointNot applicable (decomposes before boiling)
Vapor DensityNot applicable (solid, but mercury vapors may be released upon decomposition)
Water ReactivitySparingly 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 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.

SMS WhatsApp
=== 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.

SMS (short)
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

Related UN Numbers in Class 6

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