☣️ UN 3319 • CLASS 4
UN 3319 — Nitroglycerin mixture, desensitized, solid, n.o.s., with more than 2% but not more than 10% nitroglycerin
Placard: Flammable Solid. ERG Guide 113. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ 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.
UN 3319 At a Glance
UN 3319 (Nitroglycerin mixture, desensitized, solid, with more than 2% but not…) is listed as DOT Class 4 Flammable Solid and is assigned to ERG Guide 113. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 3319 covers a solid desensitized nitroglycerin mixture containing more than 2% but not more than 10% nitroglycerin. The desensitizer reduces risk only while the material remains in proper condition.
Hazard overview: The material may burn and can become explosive if dried out, heated, shocked, or exposed to friction. Fire involvement or loss of desensitizer requires explosive-material precautions.
Response guidance: Avoid handling, keep personnel away, and isolate according to ERG 113. Use water spray from a safe distance to cool containers when appropriate, and treat dried or heated material as Class 1 explosive.
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UN 3319 Quick Details
UN 3319
Product name: Nitroglycerin mixture, desensitized, solid, n.o.s., with more than 2% but not more than 10% nitroglycerin
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: Initial isolation 100m all directions. Protective action distance 300m downwind if spilled. If fire or dried material, isolate 800m and evacuate 1600m downwind. Treat dried material as Class 1 explosive.
Common Hazards of UN 3319
- 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.
Chemical Identity & Physical Properties
White to pale yellow solid or paste, desensitized with diluent. Typically odorless or faint sweet odor. Consists of nitroglycerin diluted in a solid carrier or diatomaceous earth to reduce sensitivity.
| Also known as | Desensitized nitroglycerinNG mixtureNitroglycerin desensitized solidGlyceryl trinitrate mixture desensitized |
| Appearance | White to pale yellow solid or paste, desensitized with diluent. Typically odorless or faint sweet odor. Consists of nitroglycerin diluted in a solid carrier or diatomaceous earth to reduce sensitivity. |
| Flash Point | Not applicable (desensitized explosive solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid mixture) |
| Water Reactivity | No significant reaction with water, but drying out increases explosion hazard significantly |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3319
Extinguishing Media
Do not use water jets. Use water spray to keep containers cool from distance. Dry chemical or CO2 for small fires only.
PPE Requirements
⚠️ Level B minimum with full protective clothing and SCBA. Keep unnecessary personnel away. Treat as explosive if dried out or heated.
Level B minimum with full protective clothing and SCBA. Keep unnecessary personnel away. Treat as explosive if dried out or heated.
Isolation & Evacuation
ERG 113: Initial isolation 100m all directions. Protective action distance 300m downwind if spilled. If fire or dried material, isolate 800m and evacuate 1600m downwind. Treat dried material as Class 1 explosive.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3319 Incident
- 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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📋 Copy & Share Field Card
UN 3319 — Nitroglycerin mixture, desensitized, solHAZMAT RADIO NOTE — UN 3319
Product: Nitroglycerin mixture, desensitized, solid, n.o.s., with more than 2% but not more than 10% nitroglycerin
Class 4 / Flammable Solid / ERG 113
PPE: Level B minimum with full protective clothing and SCBA. Keep unnecessary personnel away. Treat as explosive if dried out or heated.
ISOLATION: ERG 113: Initial isolation 100m all directions. Protective action distance 300m downwind if spilled. If fire or dried material, isolate 800m and evacuate 1600m downwind. Treat dried material as Class 1 explosive.
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 3319 — Nitroglycerin mixture, desensitized, solid, n.o.s., with more than 2% but not more than 10% nitroglycerin
Class: 4 | Placard: Flammable Solid | ERG Guide: 113
Appearance: White to pale yellow solid or paste, desensitized with diluent. Typically odorless or faint sweet odor. Consists of nitroglycerin diluted in a solid carrier or diatomaceous earth to reduce sensitivity.
Water Reactivity: No significant reaction with water, but drying out increases explosion hazard significantly
Extinguishing: Do not use water jets. Use water spray to keep containers cool from distance. Dry chemical or CO2 for small fires only.
PPE: Level B minimum with full protective clothing and SCBA. Keep unnecessary personnel away. Treat as explosive if dried out or heated.
Isolation: ERG 113: Initial isolation 100m all directions. Protective action distance 300m downwind if spilled. If fire or dried material, isolate 800m and evacuate 1600m downwind. Treat dried material as Class 1 explosive.
— 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 —
• 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.
SOURCE: allfirefighter.com/hazmat/un/nitroglycerin-mixture-desensitized-solid-un-3319 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3319 Nitroglycerin mixture, desensitized, solid, n.o.s., with more than 2% but not more than 10% nitroglycerin Cls4 ERG113 | allfirefighter.com/hazmat/un/nitroglycerin-mixture-desensitized-solid-un-3319SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/nitroglycerin-mixture-desensitized-solid-un-3319
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Frequently Asked Questions about UN 3319
It is desensitized for transport, but dried or heated material should be treated as explosive.
Heat, shock, friction, flame, or drying can greatly increase sensitivity.
Water spray may be used from a distance to cool containers, but avoid water jets that spread material.
SCBA, full protective clothing, and remote/defensive tactics are recommended.
ERG Guide 113 applies for initial response.
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.