☣️ UN 3555 • CLASS 3
UN 3555 — Trifluoromethyltetrazole-sodium salt in acetone
Placard: Flammable. ERG Guide 113. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 3555 is Trifluoromethyltetrazole-sodium salt in acetone, assigned to ERG Guide 113. This entry should be verified with shipping papers, labels and the SDS before responders commit to close-range action.
Hazard overview: The acetone carrier is highly flammable and dried residue may become shock-sensitive. Heat, sparks, friction, flame or evaporation of solvent can greatly increase explosion risk.
Response guidance: Use ERG Guide 113, isolate the area, keep people upwind and avoid incompatible agents. Keep water away unless incident command confirms it is safe for the specific material.
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UN 3555 Quick Details
UN 3555
Product name: Trifluoromethyltetrazole-sodium salt in acetone
DOT Class: 3
Placard type: Flammable
ERG Guide: 113 (check current ERG)
Initial isolation: ERG 113: isolate 50m all directions initially; if dried or fire involved, treat as explosive per ERG 112 guidance
Common Hazards of UN 3555
- 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
Clear to pale yellow liquid solution with characteristic acetone odor. Flammable liquid containing an organic salt that becomes shock-sensitive when dried.
| Also known as | Sodium trifluoromethyltetrazolate in acetoneNaTFMT in acetoneTrifluoromethyltetrazole sodium derivative solution |
| Appearance | Clear to pale yellow liquid solution with characteristic acetone odor. Flammable liquid containing an organic salt that becomes shock-sensitive when dried. |
| Flash Point | -20C (-4F) (acetone carrier) |
| Boiling Point | 56C (133F) (acetone component) |
| Vapor Density | 2.0 (heavier than air) |
| Water Reactivity | Dilutes in water; acetone is water-miscible but dried residue becomes extremely shock-sensitive |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3555
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; water spray to cool containers but avoid drying out material
PPE Requirements
⚠️ Level B minimum with full face SCBA; avoid shock/friction with dried residue; treat any dried material as explosive
Level B minimum with full face SCBA; avoid shock/friction with dried residue; treat any dried material as explosive. Select final PPE using ERG guidance, SDS, monitoring and incident command.
Isolation & Evacuation
ERG 113: isolate 50m all directions initially; if dried or fire involved, treat as explosive per ERG 112 guidance
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 113).
First Actions for a UN 3555 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 3555 — Trifluoromethyltetrazole-sodium salt inHAZMAT RADIO NOTE — UN 3555
Product: Trifluoromethyltetrazole-sodium salt in acetone
Class 3 / Flammable / ERG 113
PPE: Level B minimum with full face SCBA; avoid shock/friction with dried residue; treat any dried material as explosive
ISOLATION: ERG 113: isolate 50m all directions initially; if dried or fire involved, treat as explosive per ERG 112 guidance
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 3555 — Trifluoromethyltetrazole-sodium salt in acetone
Class: 3 | Placard: Flammable | ERG Guide: 113
Appearance: Clear to pale yellow liquid solution with characteristic acetone odor. Flammable liquid containing an organic salt that becomes shock-sensitive when dried.
Water Reactivity: Dilutes in water; acetone is water-miscible but dried residue becomes extremely shock-sensitive
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray to cool containers but avoid drying out material
PPE: Level B minimum with full face SCBA; avoid shock/friction with dried residue; treat any dried material as explosive
Isolation: ERG 113: isolate 50m all directions initially; if dried or fire involved, treat as explosive per ERG 112 guidance
— 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/trifluoromethyltetrazole-sodium-salt-in-un-3555 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3555 Trifluoromethyltetrazole-sodium salt in acetone Cls3 ERG113 | allfirefighter.com/hazmat/un/trifluoromethyltetrazole-sodium-salt-in-un-3555SMS / 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/trifluoromethyltetrazole-sodium-salt-in-un-3555
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Frequently Asked Questions about UN 3555
UN 3555 is Trifluoromethyltetrazole-sodium salt in acetone, assigned to ERG Guide 113.
ERG Guide 113 applies for initial isolation, protective actions and first response guidance.
The acetone carrier is highly flammable and dried residue may become shock-sensitive.
Level B minimum with full face SCBA; avoid shock/friction with dried residue; treat any dried material as explosive.
ERG 113: isolate 50m all directions initially; if dried or fire involved, treat as explosive per ERG 112 guidance.
Water compatibility depends on the specific contents and incident conditions. Check ERG 113, SDS and incident command before applying water.
Verify shipping papers, container markings, SDS, package condition and whether contents are leaking, burning or exposed.
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.