☣️ UN 0135 • CLASS 1
UN 0135 — Mercury fulminate, wetted
Placard: Explosive 1.1A. ERG Guide 112. 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.
Advertisement
UN 0135 Quick Details
UN 0135
Product name: Mercury fulminate, wetted
DOT Class: 1
Placard type: Explosive 1.1A
ERG Guide: 112 (check current ERG)
Initial isolation: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) if fire involved. Treat as mass explosion hazard. Notify explosive disposal authorities immediately.
Common Hazards of UN 0135
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
Chemical Identity & Physical Properties
| Also known as | Mercury(II) fulminateFulminate of mercuryMercuric fulminateFulminating mercury |
| CAS Number | 628-86-4 |
| Appearance | Gray to tan crystalline powder or crystals. Odorless. Solid at room temperature. Highly sensitive primary explosive typically wetted with water or alcohol for safer handling. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes explosively at approximately 165-170C) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Stable when wetted; becomes extremely sensitive when dry. Water is used as desensitizing agent. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 0135
Extinguishing Media
Do not use water on dry material. Flood with water from safe distance if wetted material ignites. No foam or dry chemical on explosives.
PPE Requirements
⚠️ Minimum Level B with full protective clothing. SCBA required. Approach only if material is confirmed wetted. Explosive ordnance disposal (EOD) personnel for dry material.
Isolation & Evacuation
ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) if fire involved. Treat as mass explosion hazard. Notify explosive disposal authorities immediately.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).
First Actions for a UN 0135 Incident
- CALL 911. Then call emergency response telephone number on shipping paper.
- Establish large isolation zone — minimum 500 meters in all directions.
- Stage upwind, uphill; limit personnel to essential responders only.
- Request Hazmat + law enforcement + additional resources immediately.
- Do not fight fire — evacuate and isolate; let burn if no life safety risk.
- Protect exposures only if safe and directed by command.
- Consult current ERG Guide 112 and follow SOP/SOG.
Advertisement
📋 Copy & Share Field Card
UN 0135 — Mercury fulminate, wettedHAZMAT RADIO NOTE — UN 0135
Product: Mercury fulminate, wetted
Class 1 / Explosive 1.1A / ERG 112
PPE: Minimum Level B with full protective clothing. SCBA required. Approach only if material is confirmed wetted. Explosive ordnance disposal (EOD) personnel for dry material.
ISOLATION: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) if fire involved. Treat as mass explosion hazard. Notify explosive disposal authorities immediately.
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 0135 — Mercury fulminate, wetted
Class: 1 | Placard: Explosive 1.1A | ERG Guide: 112
Appearance: Gray to tan crystalline powder or crystals. Odorless. Solid at room temperature. Highly sensitive primary explosive typically wetted with water or alcohol for safer handling.
Water Reactivity: Stable when wetted; becomes extremely sensitive when dry. Water is used as desensitizing agent.
Extinguishing: Do not use water on dry material. Flood with water from safe distance if wetted material ignites. No foam or dry chemical on explosives.
PPE: Minimum Level B with full protective clothing. SCBA required. Approach only if material is confirmed wetted. Explosive ordnance disposal (EOD) personnel for dry material.
Isolation: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) if fire involved. Treat as mass explosion hazard. Notify explosive disposal authorities immediately.
— Key Hazards —
• Mass explosion hazard — entire load may detonate simultaneously.
• Severe blast overpressure and fragmentation.
• Sensitive to heat, shock, and friction.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper.
• Establish large isolation zone — minimum 500 meters in all directions.
• Stage upwind, uphill; limit personnel to essential responders only.
• Request Hazmat + law enforcement + additional resources immediately.
SOURCE: allfirefighter.com/hazmat/un/0135 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0135 Mercury fulminate, wetted Cls1 ERG112 | allfirefighter.com/hazmat/un/0135SMS / 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/0135
Related UN Numbers in Class 1
Discovery block for training / quick reference. Always consult the current ERG + your SOP/SOG for operations.
Advertisement
Frequently Asked Questions about UN 0135
Mass explosion hazard — entire load may detonate simultaneously. Severe blast overpressure and fragmentation. Sensitive to heat, shock, and friction. Secondary fire and debris hazard.
CALL 911. Then call emergency response telephone number on shipping paper. Establish large isolation zone — minimum 500 meters in all directions. Stage upwind, uphill; limit personnel to essential responders only.
Minimum Level B with full protective clothing. SCBA required. Approach only if material is confirmed wetted. Explosive ordnance disposal (EOD) personnel for dry material.
Water reactivity: Stable when wetted; becomes extremely sensitive when dry. Water is used as desensitizing agent.. Recommended extinguishing: Do not use water on dry material. Flood with water from safe distance if wetted material ignites. No foam or dry chemical on explosives..
ERG Guide 112 recommendation: ERG 112: Isolate 500m (1600 ft) in all directions. Evacuate 1600m (1 mile) if fire involved. Treat as mass explosion hazard. Notify explosive disposal authorities immediately.
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.