☣️ UN 3344 • CLASS 4
Pentaerythritol tetranitrate mixture, desensitized, solid, n.o.s., with more than 10% but not more than 20% PETN
Placard: Flammable Solid. 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.
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Quick details
UN 3344
Class: 4
Placard type: Flammable Solid
ERG: Guide 113 (check current ERG)
Isolation: ERG 113: isolate 100m all directions initially; if fire or dried out, treat as mass explosion hazard - evacuate 800m+ radius
Chemical & Response Details
| Also known as | PETNPenthritePentaerythritol tetranitrateNitropentaPentritPENT |
| CAS Number | 78-11-5 |
| Appearance | White crystalline powder or solid, odorless. Desensitized mixture appears as granular solid or paste depending on formulation. |
| Flash Point | Not applicable (explosive solid) |
| Boiling Point | Not applicable (decomposes/explodes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | No significant reaction with water; however, drying of desensitized mixture increases explosive sensitivity |
| Extinguishing | Do not use water streams on dried material; fog water acceptable on wetted/desensitized material; dry chemical, CO2 |
| PPE | ⚠️ Level B minimum with full face SCBA; structural firefighting gear with SCBA for fire response; avoid shock, friction, and heat |
| Isolation | ERG 113: isolate 100m all directions initially; if fire or dried out, treat as mass explosion hazard - evacuate 800m+ radius |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
- Keep material wet with water or treat as an explosive (GUIDE 112).
- Runoff to sewer may create fire or explosion hazard.
- Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically,
- Contact may cause burns to skin and eyes.
- Fire may produce irritating, corrosive and/or toxic gases.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area immediately for at least 100 meters (330 feet) in all directions.
- Consider initial evacuation for 500 meters (1/3 mile) in all directions.
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UN 3344 — Pentaerythritol tetranitrate mixture, de HAZMAT RADIO NOTE — UN 3344
Product: Pentaerythritol tetranitrate mixture, desensitized, solid, n.o.s., with more than 10% but not more than 20% PETN
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with full face SCBA; structural firefighting gear with SCBA for fire response; avoid shock, friction, and heat
ISOLATION: ERG 113: isolate 100m all directions initially; if fire or dried out, treat as mass explosion hazard - evacuate 800m+ radius
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 3344 — Pentaerythritol tetranitrate mixture, desensitized, solid, n.o.s., with more than 10% but not more than 20% PETN
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: White crystalline powder or solid, odorless. Desensitized mixture appears as granular solid or paste depending on formulation.
Water Reactivity: No significant reaction with water; however, drying of desensitized mixture increases explosive sensitivity
Extinguishing: Do not use water streams on dried material; fog water acceptable on wetted/desensitized material; dry chemical, CO2
PPE: Level B minimum with full face SCBA; structural firefighting gear with SCBA for fire response; avoid shock, friction, and heat
Isolation: ERG 113: isolate 100m all directions initially; if fire or dried out, treat as mass explosion hazard - evacuate 800m+ radius
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/3344 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3344 Pentaerythritol tetranitrate mixture, desensitized, solid, n.o.s., with more than 10% but not more than 20% PETN Cls4 ERG113 | allfirefighter.com/hazmat/un/3344SMS / 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/3344
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FAQ
Flammable/combustible material. May be ignited by heat, sparks or flames. DRIED OUT material may explode if exposed to heat, flame, friction or shock; treat as an Keep material wet with water or treat as an explosive (GUIDE 112). Runoff to sewer may create fire or explosion hazard. Some are toxic and may be fatal if inhaled, ingested or absorbed through skin. Specifically, Contact may cause burns to skin and eyes. Fire may produce irritating, corrosive and/or toxic gases.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with full face SCBA; structural firefighting gear with SCBA for fire response; avoid shock, friction, and heat
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 113 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.