☣️ UN 3507 • CLASS 6
UN 3507 — Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted
Placard: Toxic. ERG Guide 166. 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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UN 3507 Quick Details
UN 3507
Product name: Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted
DOT Class: 6
Placard type: Toxic
ERG Guide: 166 (check current ERG)
Initial isolation: ERG 166: Small spill isolate 25m all directions. Large spill isolate 80m all directions, evacuate 500m downwind if powder spilled in open area.
Common Hazards of UN 3507
- Radiation presents minimal risk to transport workers, emergency response personnel and the public
- Low radiation hazard to people. Chemical hazard greatly exceeds radiation hazard.
- Substance reacts with water and water vapor in air to form toxic and corrosive hydrogen fluoride gas,
- Toxic; may be fatal if inhaled, ingested, or absorbed through skin.
- Direct contact with substance and gas may cause burns to skin, eyes, or respiratory tract.
- Runoff from control of cargo fire may cause low-level pollution.
- Substance does not burn.
- The material may react violently with fuels.
Chemical Identity & Physical Properties
| Also known as | UF6uranium(VI) fluorideuranium fluoridehex |
| CAS Number | 7783-81-5 |
| Appearance | Colorless to white crystalline solid at room temperature (sublimes at 56°C). Pungent, acrid odor. Highly reactive with moisture. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (sublimes at 56C/133F) |
| Vapor Density | 12.8 (much heavier than air) |
| Water Reactivity | Reacts violently with water to produce highly toxic and corrosive hydrogen fluoride gas and corrosive uranyl fluoride. Never use water directly on substance. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3507
Extinguishing Media
Dry chemical, dry sand, soda ash for small fires. DO NOT use water, foam, or CO2. For large fires, withdraw and let burn.
PPE Requirements
⚠️ Level A for leak/spill response. Full-face SCBA required. Chemical-resistant suit with respiratory protection mandatory due to HF formation from moisture contact.
Isolation & Evacuation
ERG 166: Small spill isolate 25m all directions. Large spill isolate 80m all directions, evacuate 500m downwind if powder spilled in open area.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 166).
First Actions for a UN 3507 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the
- Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Detain or isolate uninjured persons or equipment suspected to be contaminated; delay decontamination
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- See Table 1 - Initial Isolation and Protective Action Distances.
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📋 Copy & Share Field Card
UN 3507 — Uranium hexafluoride, radioactive materiHAZMAT RADIO NOTE — UN 3507
Product: Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted
Class 6 / Toxic / ERG 166
PPE: Level A for leak/spill response. Full-face SCBA required. Chemical-resistant suit with respiratory protection mandatory due to HF formation from moisture contact.
ISOLATION: ERG 166: Small spill isolate 25m all directions. Large spill isolate 80m all directions, evacuate 500m downwind if powder spilled in open area.
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 3507 — Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted
Class: 6 | Placard: Toxic | ERG Guide: 166
Appearance: Colorless to white crystalline solid at room temperature (sublimes at 56°C). Pungent, acrid odor. Highly reactive with moisture.
Water Reactivity: Reacts violently with water to produce highly toxic and corrosive hydrogen fluoride gas and corrosive uranyl fluoride. Never use water directly on substance.
Extinguishing: Dry chemical, dry sand, soda ash for small fires. DO NOT use water, foam, or CO2. For large fires, withdraw and let burn.
PPE: Level A for leak/spill response. Full-face SCBA required. Chemical-resistant suit with respiratory protection mandatory due to HF formation from moisture contact.
Isolation: ERG 166: Small spill isolate 25m all directions. Large spill isolate 80m all directions, evacuate 500m downwind if powder spilled in open area.
— Key Hazards —
• Radiation presents minimal risk to transport workers, emergency response personnel and the public
• Low radiation hazard to people. Chemical hazard greatly exceeds radiation hazard.
• Substance reacts with water and water vapor in air to form toxic and corrosive hydrogen fluoride gas,
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the
• Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
• Stay upwind, uphill and/or upstream.
SOURCE: allfirefighter.com/hazmat/un/3507 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3507 Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted Cls6 ERG166 | allfirefighter.com/hazmat/un/3507SMS / 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/3507
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Frequently Asked Questions about UN 3507
Radiation presents minimal risk to transport workers, emergency response personnel and the public Low radiation hazard to people. Chemical hazard greatly exceeds radiation hazard. Substance reacts with water and water vapor in air to form toxic and corrosive hydrogen fluoride gas, Toxic; may be fatal if inhaled, ingested, or absorbed through skin. Direct contact with substance and gas may cause burns to skin, eyes, or respiratory tract. Runoff from control of cargo fire may cause low-level pollution. Substance does not burn. The material may react violently with fuels.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
Level A for leak/spill response. Full-face SCBA required. Chemical-resistant suit with respiratory protection mandatory due to HF formation from moisture contact.
Water reactivity: Reacts violently with water to produce highly toxic and corrosive hydrogen fluoride gas and corrosive uranyl fluoride. Never use water directly on substance.. Recommended extinguishing: Dry chemical, dry sand, soda ash for small fires. DO NOT use water, foam, or CO2. For large fires, withdraw and let burn..
ERG Guide 166 recommendation: ERG 166: Small spill isolate 25m all directions. Large spill isolate 80m all directions, evacuate 500m downwind if powder spilled in open area.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 166 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.