☣️ UN 0004 • CLASS 1

Ammonium picrate, dry or wetted with less than 10% water

Placard: Explosive 1.1D. 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.
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Quick details
UN 0004
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: Isolate 800m (1/2 mile) in all directions; evacuate 1600m (1 mile) if fire or detonation risk; consider evacuation of entire area
Chemical & Response Details
Also known asPicrate of ammoniaAmmonium picrate explosiveAmmonium 2,4,6-trinitrophenolateExplosive D
CAS Number131-74-8
AppearanceYellow to orange crystalline solid with no characteristic odor. Highly sensitive explosive material that becomes increasingly dangerous when dry.
Flash PointNot applicable (explosive solid)
Boiling PointNot applicable (detonates before boiling)
Vapor DensityNot applicable (solid)
Water ReactivityRelatively stable in water; wetting reduces sensitivity. Keep wetted with at least 10% water for safe handling.
ExtinguishingWater spray only for surrounding fires; do not direct water stream onto explosive. No foam or dry chemical on explosive itself.
PPE⚠️ Full protective gear including blast-resistant suit if available; SCBA required; remote handling preferred; treat as Class 1.1D mass explosion hazard
IsolationERG 112: Isolate 800m (1/2 mile) in all directions; evacuate 1600m (1 mile) if fire or detonation risk; consider evacuation of entire area
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
  • Mass explosion hazard
  • Fragmentation and blast pressure
  • Sensitive to heat, shock, and friction
First actions (field-minded)
  • CALL 911. Then call emergency response telephone number on shipping paper.
  • Establish large isolation zone immediately — minimum 500 meters initial
  • Stage upwind, uphill; limit personnel
  • Request Hazmat + law enforcement
  • Protect exposures only if safe and directed
  • Consult current ERG Guide 112 and SOP/SOG
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UN 0004 — Ammonium picrate, dry or wetted with les
HAZMAT RADIO NOTE — UN 0004 Product: Ammonium picrate, dry or wetted with less than 10% water Class 1 / Explosive 1.1D / ERG 112 PPE: Full protective gear including blast-resistant suit if available; SCBA required; remote handling preferred; treat as Class 1.1D mass explosion hazard ISOLATION: ERG 112: Isolate 800m (1/2 mile) in all directions; evacuate 1600m (1 mile) if fire or detonation risk; consider evacuation of entire area 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 0004 — Ammonium picrate, dry or wetted with less than 10% water Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112 Appearance: Yellow to orange crystalline solid with no characteristic odor. Highly sensitive explosive material that becomes increasingly dangerous when dry. Water Reactivity: Relatively stable in water; wetting reduces sensitivity. Keep wetted with at least 10% water for safe handling. Extinguishing: Water spray only for surrounding fires; do not direct water stream onto explosive. No foam or dry chemical on explosive itself. PPE: Full protective gear including blast-resistant suit if available; SCBA required; remote handling preferred; treat as Class 1.1D mass explosion hazard Isolation: ERG 112: Isolate 800m (1/2 mile) in all directions; evacuate 1600m (1 mile) if fire or detonation risk; consider evacuation of entire area — Key Hazards — • Mass explosion hazard • Fragmentation and blast pressure • Sensitive to heat, shock, and friction — First Actions — • CALL 911. Then call emergency response telephone number on shipping paper. • Establish large isolation zone immediately — minimum 500 meters initial • Stage upwind, uphill; limit personnel • Request Hazmat + law enforcement SOURCE: allfirefighter.com/hazmat/un/0004 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.

SMS (short)
UN0004 Ammonium picrate, dry or wetted with less than 10% water Cls1 ERG112 | allfirefighter.com/hazmat/un/0004SMS / 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/0004
Related UN numbers (same class)
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
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FAQ

Mass explosion hazard Fragmentation and blast pressure Sensitive to heat, shock, and friction

CALL 911. Then call emergency response telephone number on shipping paper. Establish large isolation zone immediately — minimum 500 meters initial Stage upwind, uphill; limit personnel

Full protective gear including blast-resistant suit if available; SCBA required; remote handling preferred; treat as Class 1.1D mass explosion hazard

No. This is a training/quick-reference aid only. Always consult the current ERG Guide 112 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.