☣️ UN 0133 • CLASS 1

UN 0133 — Mannitol hexanitrate, wetted with not less than 40% water

Placard: Explosive 1.1D. 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.

Mannitol hexanitrate is a highly explosive substance that requires careful handling and storage. It is shipped as a water-dampened paste or slurry to reduce its explosive sensitivity.

Hazard overview: Mannitol hexanitrate poses an explosion hazard if it dries out, and is also sensitive to heat, shock, and friction. It can be detonated by static, friction, or shock, making it a highly dangerous substance.

Response guidance: In the event of an emergency, responders should isolate the area and evacuate anyone within 800m if there is a large fire or container exposed to fire. Water spray should be used to maintain wetting and prevent the substance from drying out.

UN 0133 Quick Details

UN 0133

Product name: Mannitol hexanitrate, wetted with not less than 40% water

DOT Class: 1

Placard type: Explosive 1.1D

ERG Guide: 112 (check current ERG)

Initial isolation: ERG 112: isolate 500m all directions in all cases; evacuate 800m if large fire or container exposed to fire; treat as mass explosion hazard

Common Hazards of UN 0133

Explosion hazard if dried out
Sensitive to heat, shock, friction
Runoff may be hazardous

Chemical Identity & Physical Properties

Mannitol hexanitrate is a white to pale yellow crystalline solid when wetted, with an odorless or slight nitrous odor.

Also known as	NitromanniteHexanitromanniteMannitol hexanitrate esterMHNNitranitol
CAS Number	15825-70-4
Appearance	White to pale yellow crystalline solid when wetted. Odorless or slight nitrous odor. Shipped as a water-dampened paste or slurry to reduce explosive sensitivity.
Flash Point	Not applicable (explosive solid)
Boiling Point	Not applicable (decomposes explosively before boiling)
Vapor Density	Not applicable (solid)
Water Reactivity	No significant reaction with water; water acts as desensitizer and must remain present

Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.

Fireground Response Guidance — UN 0133

Extinguishing Media

Water spray to maintain wetting; do not allow to dry; alcohol-resistant foam for surrounding fires

PPE Requirements

⚠️ Level A with SCBA required; full explosive ordnance disposal protective equipment recommended; avoid all static, friction, and shock

Responders should wear Level A protective equipment with SCBA, and full explosive ordnance disposal protective equipment is recommended to minimize the risk of explosion or injury.

Isolation & Evacuation

ERG 112: isolate 500m all directions in all cases; evacuate 800m if large fire or container exposed to fire; treat as mass explosion hazard

Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 112).

First Actions for a UN 0133 Incident

CALL 911. Then call emergency response number on shipping paper.
Isolate area; stage upwind
Keep product wet — do not allow to dry out
Request Hazmat + law enforcement
Consult current ERG Guide 112 and SOP/SOG

📋 Copy & Share Field Card

UN 0133 — Mannitol hexanitrate, wetted with not le

HAZMAT RADIO NOTE — UN 0133 Product: Mannitol hexanitrate, wetted with not less than 40% water Class 1 / Explosive 1.1D / ERG 112 PPE: Level A with SCBA required; full explosive ordnance disposal protective equipment recommended; avoid all static, friction, and shock ISOLATION: ERG 112: isolate 500m all directions in all cases; evacuate 800m if large fire or container exposed to fire; 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.

SMS WhatsApp

=== IC HAZMAT BRIEFING === UN 0133 — Mannitol hexanitrate, wetted with not less than 40% water Class: 1 | Placard: Explosive 1.1D | ERG Guide: 112 Appearance: White to pale yellow crystalline solid when wetted. Odorless or slight nitrous odor. Shipped as a water-dampened paste or slurry to reduce explosive sensitivity. Water Reactivity: No significant reaction with water; water acts as desensitizer and must remain present Extinguishing: Water spray to maintain wetting; do not allow to dry; alcohol-resistant foam for surrounding fires PPE: Level A with SCBA required; full explosive ordnance disposal protective equipment recommended; avoid all static, friction, and shock Isolation: ERG 112: isolate 500m all directions in all cases; evacuate 800m if large fire or container exposed to fire; treat as mass explosion hazard — Key Hazards — • Explosion hazard if dried out • Sensitive to heat, shock, friction • Runoff may be hazardous — First Actions — • CALL 911. Then call emergency response number on shipping paper. • Isolate area; stage upwind • Keep product wet — do not allow to dry out • Request Hazmat + law enforcement SOURCE: allfirefighter.com/hazmat/un/mannitol-hexanitrate-wetted-with-un-0133 | Always use current ERG + SOP/SOGIC BRIEFING

Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.

SMS (short)

UN0133 Mannitol hexanitrate, wetted with not less than 40% water Cls1 ERG112 | allfirefighter.com/hazmat/un/mannitol-hexanitrate-wetted-with-un-0133SMS / 160 CHAR

Use for: Quick text to command or incoming units. Fits in a single SMS.

Open in Messages WhatsApp

⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/mannitol-hexanitrate-wetted-with-un-0133

Related UN Numbers in Class 1

Open Class Guide →Hazmat Hub →

UN 0004 UN 0012 UN 0027 UN 0028 UN 0030 UN 0033 UN 0042 UN 0043 UN 0048 UN 0055 UN 0056 UN 0058

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

Frequently Asked Questions about UN 0133

No, UN 0133 is not flammable, but it is highly explosive if dried out or exposed to heat, shock, or friction.

If UN 0133 dries out, it poses a significant explosion hazard and should be handled with extreme caution.

UN 0133 should be stored in a cool, dry place, away from heat sources and ignition sources, and should be kept wetted to reduce its explosive sensitivity.

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.