☣️ UN 0146 • CLASS 1
Nitrostarch, dry or wetted
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 0146
Class: 1
Placard type: Explosive 1.1D
ERG: Guide 112 (check current ERG)
Isolation: ERG 112: isolate 500m minimum all directions; evacuate 1600m if fire or if dry material involved; treat as mass explosion hazard
Chemical & Response Details
| Also known as | Starch nitrateNitrated starchExplosive starchStarch dinitrate |
| Appearance | White to yellowish powder or granular solid, odorless or slight ester-like odor. Appears similar to ordinary starch but is highly explosive. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes explosively before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May be wetted with water for transport safety; wetting reduces sensitivity but material remains explosive |
| Extinguishing | Water only for cooling unexploded material from distance; no foam, CO2, or dry chemical on burning explosive |
| PPE | ⚠️ Level A with blast-resistant gear if approaching; full structural firefighting gear minimum for fire; SCBA mandatory; withdraw immediately if fire involves explosive |
| Isolation | ERG 112: isolate 500m minimum all directions; evacuate 1600m if fire or if dry material involved; treat as mass explosion hazard |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Mass explosion hazard — entire load may detonate simultaneously.
- Severe blast overpressure and fragmentation.
- Sensitive to heat, shock, and friction.
- Secondary fire and debris hazard.
First actions (field-minded)
- 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.
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UN 0146 — Nitrostarch, dry or wetted HAZMAT RADIO NOTE — UN 0146
Product: Nitrostarch, dry or wetted
Class 1 / Explosive 1.1D / ERG 112
PPE: Level A with blast-resistant gear if approaching; full structural firefighting gear minimum for fire; SCBA mandatory; withdraw immediately if fire involves explosive
ISOLATION: ERG 112: isolate 500m minimum all directions; evacuate 1600m if fire or if dry material involved; treat as mass explosion hazard
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 0146 — Nitrostarch, dry or wetted
Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112
Appearance: White to yellowish powder or granular solid, odorless or slight ester-like odor. Appears similar to ordinary starch but is highly explosive.
Water Reactivity: May be wetted with water for transport safety; wetting reduces sensitivity but material remains explosive
Extinguishing: Water only for cooling unexploded material from distance; no foam, CO2, or dry chemical on burning explosive
PPE: Level A with blast-resistant gear if approaching; full structural firefighting gear minimum for fire; SCBA mandatory; withdraw immediately if fire involves explosive
Isolation: ERG 112: isolate 500m minimum all directions; evacuate 1600m if fire or if dry material involved; treat as mass explosion hazard
— 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/0146 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN0146 Nitrostarch, dry or wetted Cls1 ERG112 | allfirefighter.com/hazmat/un/0146SMS / 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/0146
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 — 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.
Level A with blast-resistant gear if approaching; full structural firefighting gear minimum for fire; SCBA mandatory; withdraw immediately if fire involves explosive
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.